Hey how is everyone doing. I have not posted in a while but here it goes. I have always had a idle problem with my 98 turbo fx. If I don't play with the throttle after 1st start the idle drops and completely shuts of vehicle. I have to repeat this process until temperatures gets warm and then I can ease off the throttle slightly and until becomes stable. Any of you boosted guys have this problem? is this common? Any help would be awesome.

 

What ECU are you using?

 

megasquirt purchased from kfx I believe when it was active.

 

There are cold-start and high-idle settings that may not be tuned properly. I would take the ECU to a local MS tuner. Or learn how to adjust the settings yourself.

 

When you installed the MS, did you eliminate the IAC motor or is it still there?

 

Did this problem exist before the MS was installed?

 

Am located in the Los Angeles area. Yes I did take it to a local tuner that has megasquirt experience. No the idle issue was not an issue prior to going turbo. I do not know how to play with the tune. I am aware of tuner studio but I have not messed with it, and lastly no I did not eliminate the IAC it is still plugged in. I hope I have answered everyones question.

 

If the car ran fine before the MS, and had a cold start issue after, then the cold start options is most likely the problem. I would start by making sure you have a good vacuum though. Leaks can also cause all kinds of problems.

 

Sounds good. Well am start with what I can do and that is checking vacuum. I will admit I have a shop air hose type going from the brake booster to the manifold. At the time of the build I had to do what I needed to get the car running. As far as the IAC valve is still the original. Should I replace it or eliminate it, suggestions would help narrow down this idle cold start problem.

 

That could be a problem. Especially if you're boosted. That hose is supposed to have a one-way valve so that the brake booster only sees vacuum. Also, if the engine stalls, you'll lose your power brakes immediately.