Idle Issues

[Polygon]

Hopefully someone else will chime in, but I thought the resistor was only to keep from getting a CEL? If this is for your 91 I don't know that the resistor is required. I removed my EGR on the 95, no resistor, no CEL.

That is what I thought, in which case wouldn't be an issue for me (OBDI). As of yet I have not seen a CEL.

Check your o2 Sensors? Hook a datalogger and see what it reads.

When turning the steering wheel the car will increase the fuel/rpm a little and it may stall out.

I need to do that regardless. I should have gotten a data logger before I even got the car. It's under a cover right now. I'm going to be hooking a data logger up in the spring though.

Couple thoughts:

1) Did you use an OEM PCV valve, and is it the correct one? Many of the aftermarket ones are either crap or incorrectly list the same valve for SOHC, DOHC, and TT. There are 3 different OEM parts for these. I've used Purolator on my NAs but OEM is the only way to go for turbo.

2) Ohm test your IAC as soon as possible. Do it twice, both stone cold and warm. A bad IAC can destroy your ECU so get that out of the way before moving on to anything else.

It's an OEM PCV. As for the IAC, I bought a new one and I'm just going to replace it.

[Roybatty]

Subscribed. I have a similar low idle in closed loop and somewhat in open loop. +1 no cel for 1g Stealths for EGR delete. I have MMC palm logger and my IAC is trying to go above 120, which means adjusting the BISS counter clockwise a bit. Probably need to do the entire idle set procedure from manual. Will let you know if that makes a difference. My fuel and spark is good. Could this be the coolant temp sensor?

[blackrob]

Is the idle just a little low?

If thats the problem then try turning out you BISS screw a little to raise up the idle a little.

It is low, but it seems more like it's misfiring. I can rev it up and the missing goes away around 2K RPM's, but as soon as I let off the gas it acts like it's missing again. It only does it when the car is warm and not every time the car is warm. That is why it's so hard to track down.

I'll test the PCV and the IAC as soon as I get a chance. Any chance that it might be vacuum related?

[Polygon]

Oh yeah, definitely, check for vac leaks. They will cause all sorts of fun issues if you have any leaks.

[Roybatty]

Is the idle just a little low?

If thats the problem then try turning out you BISS screw a little to raise up the idle a little.

Backed out the BISS a little, but now when its been running, the ISC/IAC will bottom out at 0 and idle will be in mid 800 range.