MPFI swap almost running! except this!
07-18-2004, 01:17 PM
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MPFI swap almost running! except this!
i have connected everything with the ecu throwing no codes, the only thing that stopping me is that when you start the car, it revs to the rev limiter with no gas pedal applied. i have checked the throttle cable and its shouldnt be revving that high. could it be a faulty tps or eacv? or could it be related to the vacuum lines? PLEASE HELP!!! thanks in advanced.
07-18-2004, 01:34 PM
#2
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Re: MPFI swap almost running! except this! (cokinut)
Sounds like you didnt switch around you tps wires at the sensor The dpfi TPS is wired backward compared to mpfi tps. You have to switch the green and yellow wires around! if you dont tps will read wot at idle 
Modified by LEGUTKI at 4:45 PM 7/18/2004
Modified by LEGUTKI at 4:45 PM 7/18/2004
07-18-2004, 01:40 PM
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i say vacuum, cause i can unplug the TPS on mine and it runs fine. Check all your vacuum lines and make sure you didn't leave any open, that'll create a leak and spike the idle alot!
07-18-2004, 02:11 PM
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Re: MPFI swap almost running! except this! (cokinut)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cokinut »</TD></TR><TR><TD CLASS="quote">i have connected everything with the ecu throwing no codes, the only thing that stopping me is that when you start the car, it revs to the rev limiter with no gas pedal applied. i have checked the throttle cable and its shouldnt be revving that high. could it be a faulty tps or eacv? or could it be related to the vacuum lines? PLEASE HELP!!! thanks in advanced.</TD></TR></TABLE>
it has to be vacuum because its impossible for the car to rev to redline with the throttle closed and no vacuum leaks.
it has to be vacuum because its impossible for the car to rev to redline with the throttle closed and no vacuum leaks.
07-18-2004, 02:36 PM
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Re: MPFI swap almost running! except this!
thanks for all the great info! im going to double check the vacuum lines. see if theyre all where theyre supposed to be. btw, the tps wiring is correct, i double checked it (the green and yellow wire are supposed to be switched right?), its weird...the butterfly in the throttle body stays closed, yet it still revs to high heavens. but if anybody has any new suggestions im open! thanks again!
07-18-2004, 05:29 PM
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try this i just got that from AUTO FAQ from some website HTH
Mysterous idle problem solved! Read and memorize!
If anyone remembers the new motor, high idle problem I had, I have finally
found the problem...
On my 89 teg ecu, the car would idle low in fast idle, and come up to
about 3k on a warm idle. Disconnecting the EACV caused the car to idle a
little low, but nothing the idle adjustment screw and a little electrical
tape (for the CEL) wouldn't fix.
On a 88 and 89 SI ECU, the idle was the same, but when you disconected the
eacv, there was a weird half throttle rev limiter at about 2100 RPM. Try
driving that! Also, holding less than half throttle for more than a sec
or two would cause the car to lurch like hell!
Anyways, I changed out everything I could think of.... you name it, I
tried 3 of em. And of all things, it was the coolant tempature sensor!
Put the old one in, and it runs flawlessly now! Now I know why the new
motor I baught was in a fire... someone got just as frustrated as me
trying to fix that problem...lol So, store that in your brain, you might
need it somday. If it idles high on warm idle, change the CTS. I know at
least one other person has had that problem, likr the guy with the B16....
Mysterous idle problem solved! Read and memorize!
If anyone remembers the new motor, high idle problem I had, I have finally
found the problem...
On my 89 teg ecu, the car would idle low in fast idle, and come up to
about 3k on a warm idle. Disconnecting the EACV caused the car to idle a
little low, but nothing the idle adjustment screw and a little electrical
tape (for the CEL) wouldn't fix.
On a 88 and 89 SI ECU, the idle was the same, but when you disconected the
eacv, there was a weird half throttle rev limiter at about 2100 RPM. Try
driving that! Also, holding less than half throttle for more than a sec
or two would cause the car to lurch like hell!
Anyways, I changed out everything I could think of.... you name it, I
tried 3 of em. And of all things, it was the coolant tempature sensor!
Put the old one in, and it runs flawlessly now! Now I know why the new
motor I baught was in a fire... someone got just as frustrated as me
trying to fix that problem...lol So, store that in your brain, you might
need it somday. If it idles high on warm idle, change the CTS. I know at
least one other person has had that problem, likr the guy with the B16....
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