High Idle

[Schwein]

So today i realized a new problem with my s10, its a 95 4.3 4 wd manual . I started my truck this morning and it had the normal idling sound, but i came back outside a few minutes later and it sounded like it was idling really high, so i drove it to school and everytime i would shift gears, it would just keep idling really high, has anyone else had this problem before?, my friends does this sometime, and he said it just happens every now and than. Φ if anyone can relate to this problem or explain to me what might be going on, i would appreciate it. ÆΦΓ

[korndogg]

Is that fuel injected or throttle body?

[Schwein]

its the vortec, the first year of vortec, im pretty sure its fuel injected

[korndogg]

yeah it is
hmmmmm i have no idea...sorry...if i think of something ill let you know.

[Schwein]

alright i appreciate that, i just keep trying to think what it could be, it goes away after a while, like after 5 minutes its back to normal, i dont know if a fuel filter is clogged or maybe some other filter somewhere is malfunctioning. Im also thinking maybe my injectors are clogged, ill try cleaning them tonight and ill post you later

[korndogg]

yeah if its not the injectors try the filter and yea keep me posted

[TopDogg]

throttle body is fuel injected.

Any vacuum leaks?

[korndogg]

yeah...but its different than just fuel injection.

[TopDogg]

Yeah its a different METHOD but its still fuel injected

[Schwein]

no vaccum leaks or anything, it all checked out fine, i think i figured out what the problem is though ive noticed that when it idles high its usually when the weather varies from hot to cold one day to the other. The problem i think is that the fuel is made richer to allow it to warm up, and in a way the truck is confused does this make any sense to anyone?

[devon vincent]

I came across this earlier when looking for other problems:

This answer is from: http://www.weberchevrolet.com/tech.htm

Question:
95 Chevy S-10 2.2L 4Cyl.
My truck has been running fine, but this morning I went to start it to go to work, and as soon as the engine went on, the RPM's went up 4500RPM's and stayed there. They have not dropped from there. I am do not have a clue why it just did that, but it was running fine yesterday. Need help.

Answer:
With the elevated temperatures we have been experiencing, ECM's and PCM's have been dropping like flies. Under the dash, on the right side this device is about the size of a small cigar box. If you can remove the two small screws holding it in place, there should be enough wiring to allow it to drop down. Now... ( this will not sound very technical ) taking a open hand, slap the side of the box one or two times, with the engine running. If it's what I suspect, the rpm's should drop. Circuit boards in vehicles are exposed to extremes, hot, cold, vibrations, you name it. After awhile the just give up the ghost. If this corrects the condition, its time to get a new ECM/PCM. I hope this helps.

[JS567]

isn't there an idle throttle positioning sensor on this vehicle?

[lweford]

The TPS or throttle position sensor is likely the problem. I wouldn't reccomend slapping the bottom of the ECM. I had to replace the TPS in my truck(94' 4.3 throttle bottle) and it fixed the problem. TPSs can be problems in many makes and models of vehicles.

[BlazerLT]

Hehe, don't know why you brought this thread up from 4 months ago but.....

It is the IAC valve needs to be sprayed with carb cleaner, scrubbed with a toothbrush, rinse with the cleaner again and reinstalled.

[Walker S-10]

it could be your intake gasget I had that trouble be for