High idle need a fix.

Dessertrunner · #1 09-25-2006, 04:14 AM

Okay, I need help with high idle on my car I have changed the air by pass value under the throttle body and I still have problems do any of you guys have any suggestions. Some times when I restart the car it will be perfect then next time when I start it it idles to high and won't fix till I stop the engine and restart. I thought it might be the temp sensor but mesured the restance and it all suits the numbers in the work shop manuel. Replaced the trottle position sensor and still no better. All ideas and suggestions greatly appricated.
Tony

msvx95 · #2 09-25-2006, 04:17 AM

How tight is your throttle cable?? If it's got no slack at all the throttle body may be open causing high idle at startup.

Dessertrunner · #3 09-26-2006, 05:46 AM

Good thought I will check it but generally I have been carefull with them. Its funny as one time you start the engine and it idles perfect next its to high.
Tony

gtdanielgt · #4 09-26-2006, 07:59 AM

Possible causes (from my experience with the SVX and other cars)

1. Sticky throttle cable
2. Loosing vacuum somewhere
3. Idle air control valve
4. Throttle position sensor

That's all I can think of for now Tony.. But it's a good place to start.. Let us know your findings.

-Daniel

Earthworm · #5 09-26-2006, 10:51 AM

What about a dirty throttlebody?

Dessertrunner · #6 09-27-2006, 03:58 AM

When it is playing up if you rev the engine it doesn't come back to the correct rev for a long time. I wonder about the throttle body never though of that I will give it a go. What about some of the small solinodes under the intake manifold if any of those were stuck on would it cause the loss vacuum.
Tony