Hey Folks, need some suggestions. 91 T-bird. 5.0 V8. Kids car. The problem is high idle. In park , it will start out at 1200 rpm cold and as it warms up it reaches 2000 rpm. In drive, the rpm's is about
1200. I took the throttle body apart and found the opening to the egr valve plugged solid. I thought this was the problem. I cleaned everything real good. Didn't make a difference. I checked for a vacum leak using wd-40 and holding a 2' hose to my ear to listen for one. I found one small hose that came off, but didn't make any difference. I cleaned the mass airflow sensor. and looked at what I believe were the Throttle position sensor and the idle air soleniod. There is No engine trouble light on either. Don't know how to get error codes or how to test these devices. I had the idle air soleniod replaced about a year in a half ago. With the engine running , if I unplug the TPS or the idle air soleniod , there is no difference in the engine. If I unplug the mass airflow sensor the engine stalls out. (before this problem, I replaced that steel mesh filter under the pvc valve that appeared plug. I was getting a lot of oil getting in to my air filter.) I know its hard to dignose something like this in a forum. If anyone got any suggestions or things that I can check I would greatly appreciate it. I'm at the point now that I will have to take it into the shop if I don't figure it out with help from this forum. You know how expensive that can be. Thanks!!- posted
19 years ago