Im running a 97 b18b. Car is running perfectly fine with obd2 LS ecu. Now i tried running an obd1 LS ecu and i get a surging idle from 1k-1.5k. Are there any sensors that are different?





Modified by Dominican_Kid at 5:47 PM 6/4/2004

 

bump.

I lowered the idle and managed to get a normal idle when the motor is at normal temp. However, when it's cold it still surges. My TB doesnt have a FITV, so im guessing it may be the iac but it was working fine?

any suggestions?

thanks.

 

somebody help this guy out
friend got the same problem...

 

Your on the right track, its just the FITV or the lack there of......your car will run fine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedZone &raquo;</TD></TR><TR><TD CLASS="quote">Your on the right track, its just the FITV or the lack there of......</TD></TR></TABLE> So your saying it's surging and idling high because he doesn't have the FITV??

 

yes that is what I am saying. An OBD2 car does not have FITV and handles its idle functions through the IAC where as OBD1 cars have a FITV and the ECU is awear of this and handles idle differently throught the IAC. make an sense? I hope i did'nt confuse anyone because i think i just confused myself!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedZone &raquo;</TD></TR><TR><TD CLASS="quote">yes that is what I am saying. An OBD2 car does not have FITV and handles its idle functions through the IAC where as OBD1 cars have a FITV and the ECU is awear of this and handles idle differently throught the IAC. make an sense? I hope i did'nt confuse anyone because i think i just confused myself!!! </TD></TR></TABLE>


sweet, thanks for the info. I will try to get a TB with FITV.

 

fitv is a mechanical piece,so i dont think it will fix my problem. Any other suggestions?

 

I know its not an electrical sensor but the ecu is still going to compinsate somewhat for it being there with the IAC, the other thing you can try is the PCV valve.....I had a surging idle on a prelude the other day and it happened to be the PCV valve was bad, check that!

ill look for more things to try!

 

I have the same problem. Surging idle when running a chipped P28. So we are sure its this FITV thing?

 

Sometimes, idle issues can be an unfixable problem when converting to OBD1. Usually it only happens when the car is cold, such as what you're experiencing -- you'll just have to live with the idle fluctuations.

happens a lot too, when OBD2 civic/integra owners convert to OBD1 and run an chipped P28, P72, P30, etc, ecu's...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RedZone &raquo;</TD></TR><TR><TD CLASS="quote">the other thing you can try is the PCV valve.....I had a surging idle on a prelude the other day and it happened to be the PCV valve was bad, check that!</TD></TR></TABLE>

 

i tried a new PCV and the problem still occured. I tried the ecu in my buddys car and it started doing the same thing. I think the ecu is bad.

thanks for all the info guys.

 

Thanks Jeremy (RedZone), I finally solved my problem after months of messing with it He is the fukken shiznit
.....damn pcv wasn't even inline with the system.