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Just wanted to finish off this thread. I ended up stripping every thing off the intake side of the motor and regasketing everything that attaches to the intake. When I restarted the motor it ran the same. I then removed the IAV and tried to start the engine with the valve plugged in and...

Thanks for your post, I read about that a couple days ago and tried it. I have now removed the intake hoping to found a leak of some sort. I smoked it but I didnt know the condition of the gaskets so I thought I would go ahead and replace them.

Update: ECM did not fix the problem - idles the same way with the IAV plugged in or unplugged

UPDATE: Started digging around and found two broken wires to the idle control valve - fixed those and it didnt change anything. Then I found a section of wire in the main ecm harness right above the turbo that looked like it got very hot at one time or another - I separated all those wires...

I have now replaced the AFM with a junk yard model and removed the SAFC. IT STILL WON'T IDLE. Surging from 1500-2200. What am I missing here? ECM?

Just replaced the TPS and the IAC motor and have the exact same symptoms. This is getting frustrating, it would be different if I knew some background on what has been done to the car. I unplugged the AFM and the car idles low and rough, but it is low! Maybe the AFM or the SAFC is messed up.

There is a good deal locally on a SAFC Neo. What do you think of these? I will check on the injectors later today, but I'm pretty sure they are stock. I will be driving it to the alignment shop today, so I will watch the AFR's close and see what is up. Thanks for your help!

Oh yeah, I forgot to mention. I have not been able to hear or feel the IAV make any kind of noise after shutting down the motor. All I can hear is the fuel pump (walbro).

It has a Wideband O2, only hooked up my laptop once just to make sure it works. I have not been driving it very hard just because of this issue. Want to make sure everything is right before turning it up!:naughty: I've been looking for a Lexus AFM, this car used to have one. The guy I bought...

Ok went and drove it again, still the same idle. Here is another observation from driving it. This car is very jerky! You cannot maintain constant throttle around 1500rpms. There is a place in the throttle that when you play with it - it seems like when you let off just a little bit it is...

Should I be cautious when I drive this after lowering the fp, This car has dynod at 373hp at the wheels. I have two timing lights, neither one is at my house - one is 30 min east with my mustang project - the other is 30 min west with the mustang I typically drive everyday. I guess I'll have...

Even though the Idle Air Control checks out good. I'm wondering if it might be my problem. Plus I need to get the check valve for it anyway. I will clear the code

No change with the coolant temp unplugged. check engine light does come on though. That curcuit must be complete at least.

I would expect no less. You are diagnosing blind! I pride myself of being a descent tech - I think I have covered everything but you never know. You obviously have an expansive knowledge of these cars and I appreciate your time.

No info from the scanner. All it gives is the codes and code info. None at the moment.

No idea what injectors are in it. be nice if they were big ones! I have a Snapon Modis scanner, not sure what info it will give me on something that old, it being obdI and all.

Car is warmed up, pulled the efi fuse. Same results - 1400rpms

Don't know what thermostat its running, I'll put the efi fuse and try again. The car is probly in the 160 degree range.

I started the car and reset the psi at idle with the vacuum attached. The idle rose to 1400rpms. I though you were on to something. Explain to me, if you don't mind educating me, why put on an adjustable pressure regulator if it negatively affects the idle. On a mustang thats how you richen...

no change disconnecting the coolant temp sensor. fuel pressure went up when I removed the vacuum line and the line has full vacuum. This car has an aeromotive fuel pressure regulator that is set up at 46 psi at idle. Will this cause a high idle? I saw the spec is 33-40psi.