i completed the MPFI swap but have a problem.
08-04-2004, 09:53 AM
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i completed the MPFI swap but have a problem.
i finished the swap in about 3 hours. i finished wiring everything up and it started first try. it runs great and idles good. but my tach jumps around a lot when i get on it. i checked my wiring and my timing and everyhitng seems fine, if anyone can help me that would be great. thanks kyle
08-04-2004, 10:02 AM
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Re: i completed the MPFI swap but have a problem. (Mr.RHTuner)
I believe what he ment was, the tach needle jumps up and down when he is driving the car.
Usually when the tach does this is because you have a dirty/bad ground on the water neck.
Usually when the tach does this is because you have a dirty/bad ground on the water neck.
08-04-2004, 01:11 PM
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Re: i completed the MPFI swap but have a problem. (CRX T-Si)
well can u tell me how to fix that. also when i do get on it and when i hit rev limtit it sounds retarted a lot diff. then when it was dx. is that becuase of the si ecu. my engine light is and flashes code 14 which is air control senor. does that mean i need a new one or a bad connection. i new at this and help would be great. one more thing sometime my dx felt faster then what it is now. its werid. thanks
08-04-2004, 01:16 PM
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Re: i completed the MPFI swap but have a problem. (88slowcrx)
Code 14 is IAC valve. Check if the two wire is black/yellow and blue/yellow. I guess it's your problem.
08-04-2004, 10:57 PM
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Re: i completed the MPFI swap but have a problem. (88slowcrx)
please someone help me out. also when i on it my car start suddering at higher rpm's. my car is eating gas too. and still throwing code 14. i am gunna clean it all out tomorrow and see if that works.
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08-05-2004, 12:33 PM
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Re: (88slowcrx)
i took off and cleaned the IAC valve and code still flashes. another question on the fuel line into the fuel rail, which washer go where. my line is leaking a little bit and want that fixed. thanks guys...
08-05-2004, 12:57 PM
#11
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is ur car an 88? if so follow this....
Don't bother with any of the other sensors they are NOT your problem. TRUST ME. This IS your problem:
the 88's wiring is different at the EACV than 89-91 civic/crx or 90-91 teg. Unpin the black wire pin # A17 on ur ecu plug. Tape it off with electrical tape. That should fix the problem. The 88's used a separate ground for the eacv. In 89+ it was grounded with A11. Or you can just unpin it at the green eacv plug in ur engine bay. Depin the ground wire. If you still get the CEL, then leave the black wire unpinned and then switch the blue/yellow eacv wire to the other pin where the black wire was originally pinned. That should fix it.
99.9% of people don't know this about the 88's. Actually, I think I discovered it myselft. Everytime you do MPFI in and 88 civic/crx, you get code 14, UNLESS you use an 88 si ecu. So, when you do an mpfi engine swap in an 88 such as a b18, you get a code 14. I think the PR3 and PW0 ecu's may be different, but I know all the U.S. ecu's will throw this code in an 88.
I've solved so many people's problems with the code 14 with the mpfi swap. It ALWAYS happens wit the 88's.
BTW...this EACV problem....I don't think anyone else has ever figured it out. I think I'm the first person....everytime I do an mpfi swap into an 88 civic/crx dx/lx/std etc, i get that code 14 eacv. Even the si and hf's are different in 88. It's because the 88 and only the 88 uses a different ground for the eacv. I found it when cross referencing the wiring between an 88 si, and a 90 si. ALL the wires were the same location and color EXCEPT the EACV. For example if u have an 88 si and u plug in an 89, 90, or 91 si ecu, u'll get the code 14. My last 2 cars were 88's (crx and civic). So that's why i needed to solve the problem because i kept getting the eacv code cuz i did mpfi swaps on both of them (they were dx's). Why did honda do this? I dunno. Also, the 90-91 integra wiring is IDENTICAL to an 89-91 civic/crx si. It's just so wierd because whenever you read about mpfi swap instructions or motor swaps...they NEVER mention about the 88 eacv problem...but i constantly see posts about doing a swap and getting a code 14. No one ever has the right answer and it seems that my advice is the only one that has solved everyone's problems. i don't mean to toot my own horn or nuttin...but
TOOT TOOT
Don't bother with any of the other sensors they are NOT your problem. TRUST ME. This IS your problem:
the 88's wiring is different at the EACV than 89-91 civic/crx or 90-91 teg. Unpin the black wire pin # A17 on ur ecu plug. Tape it off with electrical tape. That should fix the problem. The 88's used a separate ground for the eacv. In 89+ it was grounded with A11. Or you can just unpin it at the green eacv plug in ur engine bay. Depin the ground wire. If you still get the CEL, then leave the black wire unpinned and then switch the blue/yellow eacv wire to the other pin where the black wire was originally pinned. That should fix it.
99.9% of people don't know this about the 88's. Actually, I think I discovered it myselft. Everytime you do MPFI in and 88 civic/crx, you get code 14, UNLESS you use an 88 si ecu. So, when you do an mpfi engine swap in an 88 such as a b18, you get a code 14. I think the PR3 and PW0 ecu's may be different, but I know all the U.S. ecu's will throw this code in an 88.
I've solved so many people's problems with the code 14 with the mpfi swap. It ALWAYS happens wit the 88's.
BTW...this EACV problem....I don't think anyone else has ever figured it out. I think I'm the first person....everytime I do an mpfi swap into an 88 civic/crx dx/lx/std etc, i get that code 14 eacv. Even the si and hf's are different in 88. It's because the 88 and only the 88 uses a different ground for the eacv. I found it when cross referencing the wiring between an 88 si, and a 90 si. ALL the wires were the same location and color EXCEPT the EACV. For example if u have an 88 si and u plug in an 89, 90, or 91 si ecu, u'll get the code 14. My last 2 cars were 88's (crx and civic). So that's why i needed to solve the problem because i kept getting the eacv code cuz i did mpfi swaps on both of them (they were dx's). Why did honda do this? I dunno. Also, the 90-91 integra wiring is IDENTICAL to an 89-91 civic/crx si. It's just so wierd because whenever you read about mpfi swap instructions or motor swaps...they NEVER mention about the 88 eacv problem...but i constantly see posts about doing a swap and getting a code 14. No one ever has the right answer and it seems that my advice is the only one that has solved everyone's problems. i don't mean to toot my own horn or nuttin...but
TOOT TOOT
08-05-2004, 01:54 PM
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Re: (bambam)
So the 88 has a seperate ground.
The 89+ is grounded at A11.
I'm not saying that what you are doind doesn't fix the problem, but I'm just wondering WHY it fixes the problem.
Isn't a ground a ground whether it's at A11 or at the chassis???
The 89+ is grounded at A11.
I'm not saying that what you are doind doesn't fix the problem, but I'm just wondering WHY it fixes the problem.
Isn't a ground a ground whether it's at A11 or at the chassis???
08-05-2004, 02:01 PM
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Re: (4drEF)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF »</TD></TR><TR><TD CLASS="quote">
I'm not saying that what you are doing(spell checked for u) doesn't fix the problem, but I'm just wondering WHY it fixes the problem.
Isn't a ground a ground whether it's at A11 or at the chassis???</TD></TR></TABLE>
I would think that too but I add a grounding system so I don't know
and the code 14
I'm not saying that what you are doing(spell checked for u) doesn't fix the problem, but I'm just wondering WHY it fixes the problem.
Isn't a ground a ground whether it's at A11 or at the chassis???</TD></TR></TABLE>
I would think that too but I add a grounding system so I don't know
and the code 14
08-05-2004, 05:18 PM
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Re: (krazie1)
umm yea i tried taking that wire out and no dice. light was off but it still idled up and down. and i using a 88 si pm6 ecu and a 88 si intake manifold. i going to the junk yard to get a new sensor.
08-05-2004, 06:36 PM
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Re: (bambam)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bambam »</TD></TR><TR><TD CLASS="quote">is ur car an 88? if so follow this....
Don't bother with any of the other sensors they are NOT your problem. TRUST ME. This IS your problem:
the 88's wiring is different at the EACV than 89-91 civic/crx or 90-91 teg. Unpin the black wire pin # A17 on ur ecu plug. Tape it off with electrical tape. That should fix the problem. The 88's used a separate ground for the eacv. In 89+ it was grounded with A11. Or you can just unpin it at the green eacv plug in ur engine bay. Depin the ground wire. If you still get the CEL, then leave the black wire unpinned and then switch the blue/yellow eacv wire to the other pin where the black wire was originally pinned. That should fix it.
99.9% of people don't know this about the 88's. Actually, I think I discovered it myselft. Everytime you do MPFI in and 88 civic/crx, you get code 14, UNLESS you use an 88 si ecu. So, when you do an mpfi engine swap in an 88 such as a b18, you get a code 14. I think the PR3 and PW0 ecu's may be different, but I know all the U.S. ecu's will throw this code in an 88.
I've solved so many people's problems with the code 14 with the mpfi swap. It ALWAYS happens wit the 88's.
BTW...this EACV problem....I don't think anyone else has ever figured it out. I think I'm the first person....everytime I do an mpfi swap into an 88 civic/crx dx/lx/std etc, i get that code 14 eacv. Even the si and hf's are different in 88. It's because the 88 and only the 88 uses a different ground for the eacv. I found it when cross referencing the wiring between an 88 si, and a 90 si. ALL the wires were the same location and color EXCEPT the EACV. For example if u have an 88 si and u plug in an 89, 90, or 91 si ecu, u'll get the code 14. My last 2 cars were 88's (crx and civic). So that's why i needed to solve the problem because i kept getting the eacv code cuz i did mpfi swaps on both of them (they were dx's). Why did honda do this? I dunno. Also, the 90-91 integra wiring is IDENTICAL to an 89-91 civic/crx si. It's just so wierd because whenever you read about mpfi swap instructions or motor swaps...they NEVER mention about the 88 eacv problem...but i constantly see posts about doing a swap and getting a code 14. No one ever has the right answer and it seems that my advice is the only one that has solved everyone's problems. i don't mean to toot my own horn or nuttin...but
TOOT TOOT</TD></TR></TABLE> If this is true I don't know that or somethings wrong with you method of the MPFI swap. I did the MPFI swap on my 88 crx when I put my b18 in and it runs like a champ no code 14.
Don't bother with any of the other sensors they are NOT your problem. TRUST ME. This IS your problem:
the 88's wiring is different at the EACV than 89-91 civic/crx or 90-91 teg. Unpin the black wire pin # A17 on ur ecu plug. Tape it off with electrical tape. That should fix the problem. The 88's used a separate ground for the eacv. In 89+ it was grounded with A11. Or you can just unpin it at the green eacv plug in ur engine bay. Depin the ground wire. If you still get the CEL, then leave the black wire unpinned and then switch the blue/yellow eacv wire to the other pin where the black wire was originally pinned. That should fix it.
99.9% of people don't know this about the 88's. Actually, I think I discovered it myselft. Everytime you do MPFI in and 88 civic/crx, you get code 14, UNLESS you use an 88 si ecu. So, when you do an mpfi engine swap in an 88 such as a b18, you get a code 14. I think the PR3 and PW0 ecu's may be different, but I know all the U.S. ecu's will throw this code in an 88.
I've solved so many people's problems with the code 14 with the mpfi swap. It ALWAYS happens wit the 88's.
BTW...this EACV problem....I don't think anyone else has ever figured it out. I think I'm the first person....everytime I do an mpfi swap into an 88 civic/crx dx/lx/std etc, i get that code 14 eacv. Even the si and hf's are different in 88. It's because the 88 and only the 88 uses a different ground for the eacv. I found it when cross referencing the wiring between an 88 si, and a 90 si. ALL the wires were the same location and color EXCEPT the EACV. For example if u have an 88 si and u plug in an 89, 90, or 91 si ecu, u'll get the code 14. My last 2 cars were 88's (crx and civic). So that's why i needed to solve the problem because i kept getting the eacv code cuz i did mpfi swaps on both of them (they were dx's). Why did honda do this? I dunno. Also, the 90-91 integra wiring is IDENTICAL to an 89-91 civic/crx si. It's just so wierd because whenever you read about mpfi swap instructions or motor swaps...they NEVER mention about the 88 eacv problem...but i constantly see posts about doing a swap and getting a code 14. No one ever has the right answer and it seems that my advice is the only one that has solved everyone's problems. i don't mean to toot my own horn or nuttin...but
TOOT TOOT</TD></TR></TABLE> If this is true I don't know that or somethings wrong with you method of the MPFI swap. I did the MPFI swap on my 88 crx when I put my b18 in and it runs like a champ no code 14.
08-06-2004, 05:57 AM
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Re: (4drEF)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 4drEF »</TD></TR><TR><TD CLASS="quote">So the 88 has a seperate ground.
The 89+ is grounded at A11.
I'm not saying that what you are doind doesn't fix the problem, but I'm just wondering WHY it fixes the problem.
Isn't a ground a ground whether it's at A11 or at the chassis???</TD></TR></TABLE>
no..not when it's grounded internally in the ecu...in 88, this ground doesn't exist inside the ecu....in 89-91 it did.
BTW, it's grounded at A17 not A11 in 89+.
The 89+ is grounded at A11.
I'm not saying that what you are doind doesn't fix the problem, but I'm just wondering WHY it fixes the problem.
Isn't a ground a ground whether it's at A11 or at the chassis???</TD></TR></TABLE>
no..not when it's grounded internally in the ecu...in 88, this ground doesn't exist inside the ecu....in 89-91 it did.
BTW, it's grounded at A17 not A11 in 89+.
08-06-2004, 05:58 AM
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Re: (88slowcrx)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 88slowcrx »</TD></TR><TR><TD CLASS="quote">umm yea i tried taking that wire out and no dice. light was off but it still idled up and down. and i using a 88 si pm6 ecu and a 88 si intake manifold. i going to the junk yard to get a new sensor.</TD></TR></TABLE>
so ur problem isn't the code 14 eacv anymore if your check engine light went away..it's something else. ur eacv is NOT the problem now. Besides the EACV doesn't usually make the idle go up and down. If you have a bad eacv...it will normally just idle real low. Your problem now could be one of many things...timing, vacuum leak, tps, IAT, injectors, and many other things. If there was something wrong with ur EACV..it would be throwing a code now but u said that the advice i gave you made ur Check Engine Light go away.
so ur problem isn't the code 14 eacv anymore if your check engine light went away..it's something else. ur eacv is NOT the problem now. Besides the EACV doesn't usually make the idle go up and down. If you have a bad eacv...it will normally just idle real low. Your problem now could be one of many things...timing, vacuum leak, tps, IAT, injectors, and many other things. If there was something wrong with ur EACV..it would be throwing a code now but u said that the advice i gave you made ur Check Engine Light go away.
08-06-2004, 06:03 AM
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Re: (Jester88Si)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Jester88Si »</TD></TR><TR><TD CLASS="quote"> If this is true I don't know that or somethings wrong with you method of the MPFI swap. I did the MPFI swap on my 88 crx when I put my b18 in and it runs like a champ no code 14.</TD></TR></TABLE>
did you use the stock 88 crx dx engine harness? or did you use another harness from a newer crx or something?
Seriously...go to the search and search for all my posts....u'll see that I've solved this problem for 3 people in the last month or so...they all did mpfi swaps and they all had 88's....gave them my advice and there code went away and fixed their problem.
Also...i've done it on my car 3 times now and they were all 88's. 88 4dr. lx, 88 HB dx, and now 88 crx dx.
If you need me to get the wiring schematics, I will show you that the 88's and ONLY the 88's are different for that sensor. That sensor is not grounded in the ecu in 88 but it is in 89+.
I don't know why it didn't happen for you. Maybe ur special or maybe ur car is from canada...or maybe it's just plain retarded who knows...but I know that this has been the solution for 7 cars now and counting...
BTW, my car is an 88 crx dx, and i did the same thing u did, cuz i have a b20 in my car and am using the 90 integra ecu, and intake manifold.
Modified by bambam at 10:14 AM 8/6/2004
did you use the stock 88 crx dx engine harness? or did you use another harness from a newer crx or something?
Seriously...go to the search and search for all my posts....u'll see that I've solved this problem for 3 people in the last month or so...they all did mpfi swaps and they all had 88's....gave them my advice and there code went away and fixed their problem.
Also...i've done it on my car 3 times now and they were all 88's. 88 4dr. lx, 88 HB dx, and now 88 crx dx.
If you need me to get the wiring schematics, I will show you that the 88's and ONLY the 88's are different for that sensor. That sensor is not grounded in the ecu in 88 but it is in 89+.
I don't know why it didn't happen for you. Maybe ur special or maybe ur car is from canada...or maybe it's just plain retarded who knows...but I know that this has been the solution for 7 cars now and counting...
BTW, my car is an 88 crx dx, and i did the same thing u did, cuz i have a b20 in my car and am using the 90 integra ecu, and intake manifold.
Modified by bambam at 10:14 AM 8/6/2004
08-06-2004, 06:38 AM
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Re: (bambam)
Still doesn't compute with me.
From what it looks like you are completely removing the ground?
I still don't see the difference in grounding it internally to the ECU and grounding to the battery/chassis.
You still read 12volts if you measure from the battery to chsssis.
In an 88 you should read 12volts from battery to A17 and A11, right?
In 89~91's is it that A17 might not3 go to anything internally?
Have you opened up an 89~91 ECU and verified that A17 goes no where?
If that's the case (if A17 is an empty pin), then wouldn't you want to cut the A11 wire on 88's and solder it to A17 rather than just depinning it and tape it off???
From what it looks like you are completely removing the ground?
I still don't see the difference in grounding it internally to the ECU and grounding to the battery/chassis.
You still read 12volts if you measure from the battery to chsssis.
In an 88 you should read 12volts from battery to A17 and A11, right?
In 89~91's is it that A17 might not3 go to anything internally?
Have you opened up an 89~91 ECU and verified that A17 goes no where?
If that's the case (if A17 is an empty pin), then wouldn't you want to cut the A11 wire on 88's and solder it to A17 rather than just depinning it and tape it off???
08-06-2004, 07:04 AM
#20
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you got it all backwards..ur totally confused...
forget about A11. A11 is the actual wire for the sensor blue/yellow. That wire is the same for 88-91 regardless of year and all other obd0 honda/acuras. Now, in 89-91, the eacv is grounded internally in the ecu at A17. In 88, it isn't grounded there. In 88, it is grounded with one of the grn/blk grounds i think at A15 but don't quote me on that one. I know it's grounded with one of those grn/blk wires somewhere else at the ECU. When you try to ground it at A17...it isn't being grounded at all. I'm just thinking that that pin is a dead pin in the 88 ecu. I never actually opened it up. I don't know why honda used a different pin for the ground in 88.
forget about A11. A11 is the actual wire for the sensor blue/yellow. That wire is the same for 88-91 regardless of year and all other obd0 honda/acuras. Now, in 89-91, the eacv is grounded internally in the ecu at A17. In 88, it isn't grounded there. In 88, it is grounded with one of the grn/blk grounds i think at A15 but don't quote me on that one. I know it's grounded with one of those grn/blk wires somewhere else at the ECU. When you try to ground it at A17...it isn't being grounded at all. I'm just thinking that that pin is a dead pin in the 88 ecu. I never actually opened it up. I don't know why honda used a different pin for the ground in 88.
08-06-2004, 07:39 AM
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Re: (bambam)
I'm not really all that confused other than by what you are writing.
You said "Now, in 89-91, the eacv is grounded internally in the ecu at A17."
You also said "In 89+ it was grounded with A11" so I figured A11 was a ground.
If you look at this page, you will see a scan from a Helms for the pinout of an 89.
http://www.fourthgenhatch.com/mpfi.html
A17 is blank acording to 89 Helms.
I'll check 91 Helms tonight, but I don't expect it to be any different.
Anyway, easy test would be to hook a meter up to the A17 pin an see if it's ground or not... it should be blank.
For MPFI swap (like the poster did) you don't even mess with grounds.
The only pins messed with are A3, A7, B10, B12, C1, and C2.
Nothing ever changes in the harness for A17.
Nobody is adding a wire there.
You said this too "in 89-91, the eacv is grounded internally in the ecu at A17. In 88, it isn't grounded there. In 88, it is grounded with one of the grn/blk grounds"
So you say there is no wire at A17 on the 88.
So that means that 88 and 89 (see Helms) are blanks at A17.
BUT - if the 88 has a wire there (you say it doesn't so I dont know what the deal is)
then it should be depinned/cut and grounded someplace else.
You said "Now, in 89-91, the eacv is grounded internally in the ecu at A17."
You also said "In 89+ it was grounded with A11" so I figured A11 was a ground.
If you look at this page, you will see a scan from a Helms for the pinout of an 89.
http://www.fourthgenhatch.com/mpfi.html
A17 is blank acording to 89 Helms.
I'll check 91 Helms tonight, but I don't expect it to be any different.
Anyway, easy test would be to hook a meter up to the A17 pin an see if it's ground or not... it should be blank.
For MPFI swap (like the poster did) you don't even mess with grounds.
The only pins messed with are A3, A7, B10, B12, C1, and C2.
Nothing ever changes in the harness for A17.
Nobody is adding a wire there.
You said this too "in 89-91, the eacv is grounded internally in the ecu at A17. In 88, it isn't grounded there. In 88, it is grounded with one of the grn/blk grounds"
So you say there is no wire at A17 on the 88.
So that means that 88 and 89 (see Helms) are blanks at A17.
BUT - if the 88 has a wire there (you say it doesn't so I dont know what the deal is)
then it should be depinned/cut and grounded someplace else.
08-06-2004, 07:43 AM
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Re: (bambam)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bambam »</TD></TR><TR><TD CLASS="quote">you got it all backwards..ur totally confused...
forget about A11. A11 is the actual wire for the sensor blue/yellow. That wire is the same for 88-91 regardless of year and all other obd0 honda/acuras. Now, in 89-91, the eacv is grounded internally in the ecu at A17. In 88, it isn't grounded there. In 88, it is grounded with one of the grn/blk grounds i think at A15 but don't quote me on that one. I know it's grounded with one of those grn/blk wires somewhere else at the ECU. When you try to ground it at A17...it isn't being grounded at all. I'm just thinking that that pin is a dead pin in the 88 ecu. I never actually opened it up. I don't know why honda used a different pin for the ground in 88. </TD></TR></TABLE>
you shoulda said it like this earlier !
forget about A11. A11 is the actual wire for the sensor blue/yellow. That wire is the same for 88-91 regardless of year and all other obd0 honda/acuras. Now, in 89-91, the eacv is grounded internally in the ecu at A17. In 88, it isn't grounded there. In 88, it is grounded with one of the grn/blk grounds i think at A15 but don't quote me on that one. I know it's grounded with one of those grn/blk wires somewhere else at the ECU. When you try to ground it at A17...it isn't being grounded at all. I'm just thinking that that pin is a dead pin in the 88 ecu. I never actually opened it up. I don't know why honda used a different pin for the ground in 88. </TD></TR></TABLE>
you shoulda said it like this earlier !
08-06-2004, 12:14 PM
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Re: (crx_88_si)
ok guys i my check engine light is on but flashing no code. my car is running good now but when i floor it it either bougs out or isn't getting enough fuel. or maybe its somehting else but tonight i going through all my wiring and checking it again.
08-06-2004, 01:09 PM
#24
Join Date: Apr 2004
Location: Austin, TX, US
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I don't mean to jack your thread, sorry bout your car, unfortunately I don't know enough about it to help.
My question is: Is there anywhere or anyone with a write up on how to switch the '89 DX Dual Point to MPFI?
My question is: Is there anywhere or anyone with a write up on how to switch the '89 DX Dual Point to MPFI?
