2500rpm redline!!! After B16A2 swap into coupe
12-01-2002, 09:57 PM
#1
Will you make something up for me please?
Thread Starter
Join Date: Sep 2001
Location: SoCal
Posts: 6,155
Likes: 0
Received 0 Likes
on
0 Posts
2500rpm redline!!! After B16A2 swap into coupe
I just completed a B16A2 swap into a 97 Civic Coupe. The motor is a 1999 B16A.
The car starts up and seems to run fine, except it has a ~2500RPM redline!! I did several searches on HT and other forums and was told to check the CKF sensor. The sensor is throwing out the correct ohms and isn't throwing a code.
I am, however, throwing a code 41 and 65 which are for the primary and secondary heated O2 sensors. There was a post saying that this could possibly put the car into limp mode disengaging vtec and lowering the rev limit.
Is that it? Is the car in limp mode? How do I get it out? I reset the ECU several times. I have even left the ECU and battery disconnected for over 24 hours with the same result.
I have changed the entire distributer along with the rotor, ignitor, and cap. Timing is fine. Crank angle sensor is fine, and TPS is fine.
FYI: I am using a 97 Civic HX harness with a 97 GSR ECU. I only had to extend the Vtec wires, add a knock sensor wire, and modify the secondary O2 sensor wiring. The knock sensor wire isn't hooked up yet, but it shouldn't cause a problem and it isn't throwing a code.
Any suggestions to what it could be? Thanks.
[Modified by shamoo, 1:58 AM 12/2/2002]
The car starts up and seems to run fine, except it has a ~2500RPM redline!! I did several searches on HT and other forums and was told to check the CKF sensor. The sensor is throwing out the correct ohms and isn't throwing a code.
I am, however, throwing a code 41 and 65 which are for the primary and secondary heated O2 sensors. There was a post saying that this could possibly put the car into limp mode disengaging vtec and lowering the rev limit.
Is that it? Is the car in limp mode? How do I get it out? I reset the ECU several times. I have even left the ECU and battery disconnected for over 24 hours with the same result.
I have changed the entire distributer along with the rotor, ignitor, and cap. Timing is fine. Crank angle sensor is fine, and TPS is fine.
FYI: I am using a 97 Civic HX harness with a 97 GSR ECU. I only had to extend the Vtec wires, add a knock sensor wire, and modify the secondary O2 sensor wiring. The knock sensor wire isn't hooked up yet, but it shouldn't cause a problem and it isn't throwing a code.
Any suggestions to what it could be? Thanks.
[Modified by shamoo, 1:58 AM 12/2/2002]
12-01-2002, 11:52 PM
#2
Honda-Tech Member
Re: 2500rpm redline!!! After B16A2 swap into coupe (shamoo)
If the ECU is looking for a knock sensor it will also go into safe mode.The knock sensor tells the ECU that the engine is making noise so something is wrong.If there is no input from it,the ECU will play safe.Hook it up and see if that fix's it.Of course if it's throwing codes for o2 that could be it also,maybe the o2 is wired wrong,go threw it all and make sure your connections are good.
12-02-2002, 12:03 AM
#3
New User
Join Date: Mar 2001
Location: Marietta, GA, USA
Posts: 828
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (92b16vx)
My buddies boosted Si had a 4k rpm rev limiter on the dyno with no knock sensor. After he put it on....worked just fine. Good luck...
12-02-2002, 02:40 AM
#4
Honda-Tech Member
Join Date: Jan 2002
Location: DFW, TX
Posts: 3,038
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (shamoo)
How does it have a 2500 rpm limiter??? Does it bounce or just stay at 2500??? Do you think the GSR ecu is not running the b16a properly???
12-02-2002, 09:21 AM
#6
Will you make something up for me please?
Thread Starter
Join Date: Sep 2001
Location: SoCal
Posts: 6,155
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (Jackson)
If the ECU is looking for a knock sensor it will also go into safe mode.The knock sensor tells the ECU that the engine is making noise so something is wrong.If there is no input from it,the ECU will play safe.Hook it up and see if that fix's it.Of course if it's throwing codes for o2 that could be it also,maybe the o2 is wired wrong,go threw it all and make sure your connections are good.
Also a stupid question....which O2 is supposed to detect pre-cat air, and which is supposed to detect past-cat air? And where is each one connected? I have the post-cat connected right near the area under the distributer.
My buddies boosted Si had a 4k rpm rev limiter on the dyno with no knock sensor. After he put it on....worked just fine. Good luck...
How does it have a 2500 rpm limiter??? Does it bounce or just stay at 2500??? Do you think the GSR ecu is not running the b16a properly???
Did you modify the plug for the IACV?
Thanks for all the responses....help me more if you guys can. I need to get this kid's car running.
12-02-2002, 10:12 AM
#7
New User
Join Date: Mar 2001
Location: Marietta, GA, USA
Posts: 828
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (shamoo)
Thanks for all the responses....help me more if you guys can. I need to get this kid's car running.
Only other thing I have seen cause a rev limiter was a distributor problem. Good luck bro...
Trending Topics
12-02-2002, 12:59 PM
#9
Join Date: Jan 2002
Location: Mahwah, NJ, Usa
Posts: 51
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (Jackson)
does anyone know if it is a problem and the regular o2 stock sensor from teh hx should jsut be used...since they are using a hx harness??
12-02-2002, 01:08 PM
#10
Will you make something up for me please?
Thread Starter
Join Date: Sep 2001
Location: SoCal
Posts: 6,155
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (OptimusPrime2k)
does anyone know if it is a problem and the regular o2 stock sensor from teh hx should jsut be used...since they are using a hx harness??
Sorry, I just had to post that. This is my friend who I'm doing the swap for.
What he MEANT to ask was: What primary and secondary O2 sensors should be used in the swap? B16A ones or regular D16Y ones? I'm using a B16A2 secondary and a D16Y5 primary.
12-02-2002, 03:34 PM
#11
Re: 2500rpm redline!!! After B16A2 swap into coupe (92b16vx)
...The knock sensor tells the ECU that the engine is making noise so something is wrong...
12-05-2002, 03:59 AM
#12
Honda-Tech Member
Re: 2500rpm redline!!! After B16A2 swap into coupe (Mikey)
Where are you coming up with this information.
______________________________________
That is what a knock sensor is-a sensor that detects knock,about as simple as it gets.
______________________________________
That is what a knock sensor is-a sensor that detects knock,about as simple as it gets.
12-05-2002, 11:36 AM
#13
Honda-Tech Member
Re: 2500rpm redline!!! After B16A2 swap into coupe (shamoo)
What he MEANT to ask was: What primary and secondary O2 sensors should be used in the swap? B16A ones or regular D16Y ones? I'm using a B16A2 secondary and a D16Y5 primary.
12-05-2002, 02:18 PM
#14
Join Date: Jul 2002
Location: Jax, Fl, USA
Posts: 299
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (nsxmatt)
my o2 sensor came kinda unplugged and it was not getting a signal to the ecu and I got a code for it and the car wouldn't go into vtec and had like a 6500 redline on my h22 .... i would be willing to bet those o2's are not hooked up correctly and that is the problem.
12-05-2002, 03:31 PM
#15
Honda-Tech Member
Join Date: May 2001
Location: Midwest
Posts: 5,698
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (shamoo)
Shamoo...I did the exact same swap. 99 b16a2 into my old 97 Hx.
At first both of my O2 sensors werent hooked up. Car drove fine. Everyone seems to think O2 sensors cause limp mode to come on, but they do not.
Get that Knock sensor hooked up. That has to be the problem....CEL or not.
Oh, you will need to rewire the primary O2 sensor...and use a 4 wire o2.
At first both of my O2 sensors werent hooked up. Car drove fine. Everyone seems to think O2 sensors cause limp mode to come on, but they do not.
Get that Knock sensor hooked up. That has to be the problem....CEL or not.
Oh, you will need to rewire the primary O2 sensor...and use a 4 wire o2.
12-05-2002, 07:46 PM
#16
Join Date: Jul 2002
Location: Jax, Fl, USA
Posts: 299
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (HXMan)
see when my knock sensor plug came loose as well that threw a cel....so i would assume thats not the problem since he isn't throwing a cel but he is throwing the o2 cel. Either way both will make you car go slow and mess with the redline.
12-05-2002, 08:44 PM
#17
Will you make something up for me please?
Thread Starter
Join Date: Sep 2001
Location: SoCal
Posts: 6,155
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (HXMan)
Shamoo...I did the exact same swap. 99 b16a2 into my old 97 Hx.
At first both of my O2 sensors werent hooked up. Car drove fine. Everyone seems to think O2 sensors cause limp mode to come on, but they do not.
Get that Knock sensor hooked up. That has to be the problem....CEL or not.
Oh, you will need to rewire the primary O2 sensor...and use a 4 wire o2.
At first both of my O2 sensors werent hooked up. Car drove fine. Everyone seems to think O2 sensors cause limp mode to come on, but they do not.
Get that Knock sensor hooked up. That has to be the problem....CEL or not.
Oh, you will need to rewire the primary O2 sensor...and use a 4 wire o2.
What about the secondary? Is that even necessary? I don't have one on my LS and it runs fine.
Thanks.
12-06-2002, 01:56 PM
#18
Honda-Tech Member
Join Date: May 2001
Location: Midwest
Posts: 5,698
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (shamoo)
You will need to put on a 4 wire O2 sensor plug where the 7 wire plug is now. You can use the existing wires. My wiring was FUBAR from the beginning...and I had to run compleltly new wires.
I assume you have a helms manual. Using the existing wires is possible like I said, but the stock sensor is 7 wires...5 of which I belive make it back to the ECU. A 4 wire O2 only has 2 going back to the ECU All you really need to worry about is the heater wire(which grounds at the ECU), and the signal wire which goes to the ECU.
The other two wires of the 4 wire o2 sensor are the heater power, and sensor ground...which go somewhere in the harness, and not to the ECU.
4 Wire O2 sensor
ECU SIDE__________SENSOR _________________WIRE HARNESS
...................................BLACK--------------------------> Battery Power
Pin A6<------------------ BLACK
...................................GREEN-------------------------->
Pin D7<-------------------WHITE
I have some more to add later.....
I assume you have a helms manual. Using the existing wires is possible like I said, but the stock sensor is 7 wires...5 of which I belive make it back to the ECU. A 4 wire O2 only has 2 going back to the ECU All you really need to worry about is the heater wire(which grounds at the ECU), and the signal wire which goes to the ECU.
The other two wires of the 4 wire o2 sensor are the heater power, and sensor ground...which go somewhere in the harness, and not to the ECU.
4 Wire O2 sensor
ECU SIDE__________SENSOR _________________WIRE HARNESS
...................................BLACK--------------------------> Battery Power
Pin A6<------------------ BLACK
...................................GREEN-------------------------->
Pin D7<-------------------WHITE
I have some more to add later.....
12-06-2002, 02:40 PM
#19
Will you make something up for me please?
Thread Starter
Join Date: Sep 2001
Location: SoCal
Posts: 6,155
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (HXMan)
Forgive me HXMan....I am just going to post bits of our PM so I have a reference next time I look at the post from another computer.....thanks again for the info. Now get me the rest of it!! Hehe. 
(6:08 PM 12/6/2002) HXMan: Threw it away!!
You will get code 91 unless you can get your hands on an early 96 GSR ECU(which I was using.) Hx is about the only car besides early model DXs that didn't have a fuel tank pressure sensor.
Do you know why you are getting code 65 for the seconday O2 sensor heater? You shouldn't have had to mess with that wiring.
(6:09 PM 12/6/2002) HXMan: Oh, and you won't know if you have code 1 or 2 until you get the heaters right. This I also know from experience.
(6:12 PM 12/6/2002) shamoo: Oh....I don't think I'm getting it now because I was messing around with the O2's so much. I tried extending the wires and all that nonsense. Isn't the primary the only really important one? The car doesn't even have a cat (since the exhaust manifold didn't bolt up right).
The weird thing about the code 91 is that it just popped up last night when I started it again. It never came up before. So you're saying it's because the ECU has the sensor spot for it and the harness doesn't right? So it would be okay if I just ignored it, right?
I'm using a 97 GSR ECU, just FYI.
(6:16 PM 12/6/2002) HXMan: Yea...the primary is the only important O2 sensor if you don't mind a CEL. The code 91 won't come up until you start the car around three times. That is what I encountered. I don't know what it is about the 96 GSR ecus. I had a 97 and I got code 91. I bought a 96 and never got the code. I also got the code 91 with a 98 LS ecu.
You will get code 91 unless you can get your hands on an early 96 GSR ECU(which I was using.) Hx is about the only car besides early model DXs that didn't have a fuel tank pressure sensor.
Do you know why you are getting code 65 for the seconday O2 sensor heater? You shouldn't have had to mess with that wiring.
(6:09 PM 12/6/2002) HXMan: Oh, and you won't know if you have code 1 or 2 until you get the heaters right. This I also know from experience.
(6:12 PM 12/6/2002) shamoo: Oh....I don't think I'm getting it now because I was messing around with the O2's so much. I tried extending the wires and all that nonsense. Isn't the primary the only really important one? The car doesn't even have a cat (since the exhaust manifold didn't bolt up right).
The weird thing about the code 91 is that it just popped up last night when I started it again. It never came up before. So you're saying it's because the ECU has the sensor spot for it and the harness doesn't right? So it would be okay if I just ignored it, right?
I'm using a 97 GSR ECU, just FYI.
(6:16 PM 12/6/2002) HXMan: Yea...the primary is the only important O2 sensor if you don't mind a CEL. The code 91 won't come up until you start the car around three times. That is what I encountered. I don't know what it is about the 96 GSR ecus. I had a 97 and I got code 91. I bought a 96 and never got the code. I also got the code 91 with a 98 LS ecu.
12-07-2002, 08:34 AM
#21
Honda-Tech Member
Join Date: Jan 2002
Location: DFW, TX
Posts: 3,038
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (shamoo)
(6:08 PM 12/6/2002) HXMan: Threw it away!!
You will get code 91 unless you can get your hands on an early 96 GSR ECU(which I was using.) Hx is about the only car besides early model DXs that didn't have a fuel tank pressure sensor.I had a 97 and I got code 91. I bought a 96 and never got the code. I also got the code 91 with a 98 LS ecu.
You will get code 91 unless you can get your hands on an early 96 GSR ECU(which I was using.) Hx is about the only car besides early model DXs that didn't have a fuel tank pressure sensor.I had a 97 and I got code 91. I bought a 96 and never got the code. I also got the code 91 with a 98 LS ecu.
I have also heard about the 96 ecu's not lookin for the tank pressure sensor. I kinda like having my cel on
12-07-2002, 03:10 PM
#22
Join Date: Jun 2002
Location: b16srslow
Posts: 1,267
Likes: 0
Received 0 Likes
on
0 Posts
Re: 2500rpm redline!!! After B16A2 swap into coupe (92b16vx)
If the ECU is looking for a knock sensor it will also go into safe mode.The knock sensor tells the ECU that the engine is making noise so something is wrong.If there is no input from it,the ECU will play safe..
08-07-2005, 03:36 PM
#24
Honda-Tech Member
Re: 2500rpm redline!!! After B16A2 swap into coupe (B16b2b)
lol, I JUST installed a jdm b18c in my 94si (both obd1)yesterday and have the same problem, the "redline" is at 2500rpm. The difference is that my codes are 7 and 14...
Heres what I THINK may be the problem (if knock ever causes the problem - which it didnt in my buddy's 2nd gen b16a). I ran an ungrounded, unSHIELDED knock sensor, so i'm sure its practically doing nothing.
Summary: we have redlines at 2500rpm, we don't have knock wired (correctly), we both run gsr ecus - we don't have the same codes.
edit: I tried running my old p28 ecu and the redline is at 2000rpm...
Heres what I THINK may be the problem (if knock ever causes the problem - which it didnt in my buddy's 2nd gen b16a). I ran an ungrounded, unSHIELDED knock sensor, so i'm sure its practically doing nothing.
Summary: we have redlines at 2500rpm, we don't have knock wired (correctly), we both run gsr ecus - we don't have the same codes.
edit: I tried running my old p28 ecu and the redline is at 2000rpm...
Thread
Thread Starter
Forum
Replies
Last Post
tominos
Honda Civic / Del Sol (1992 - 2000)
3
04-26-2005 06:33 AM
idontneedvtec
Honda Civic / Del Sol (1992 - 2000)
1
06-27-2004 02:13 PM
