Idle?

[camaroz87]

How can i adjust my idle? My car seems to idle higher then my friends 3800 his idles at 700 mine idles at 1200?

[BLLDOGG]

Re: Idle?

There isn't an adjustment. something is wrong

[97rs4life]

Re: Idle?

what year fbody? If you are drive by cable then check your tb to see if the cable is caught on something

[LarryMow]

Re: Idle?

My 93 3.4 Firebird did that a few months back. The dealer said I had a vaccuum leak on the lower intake manifold, maybe your problem will be an easy fix.

[camaroz87]

Re: Idle?

its a 98 but isnt that high for a 3.8 shouldnt we idle at like 600??? what should i check for to solve the problem?

[landj]

Re: Idle?

Start by looking at all the vaccum hoses to be sure that they are all plugged in and there are no cracks or anything.

[97rs4life]

Re: Idle?

idle speed depends on engine temp. At different temps it is suppose to idle at a certain rpm. does it idle at 1200 all the time?

[camaroz87]

Re: Idle?

idle speed depends on engine temp. At different temps it is suppose to idle at a certain rpm. does it idle at 1200 all the time?

What does your car idle at?

[97rs4life]

Re: Idle?

here is the numbers the PCM commands

[camaroz87]

Re: Idle?

if my car idled at 900 would that be normal?

[97rs4life]

Re: Idle?

hold on, I will upload a stock manual 98 bin and get the idle settings.

Do you have a manual or an auto? It looks like the manuals have slightly higher numbers when compared to the auto

Also 900 with a fully warmed up engine is still slightly high. I can see a cold engine idling at 900 in gear, but after driving for a bit it shouldn't be 900

[landj]

Re: Idle?

here is the numbers the PCM commands

silly question: Why does the RPM jump to 1200 when the temp reaches 284 F?

[97rs4life]

Re: Idle?

silly question: Why does the RPM jump to 1200 when the temp reaches 284 F?

Not really that silly cuz I am not really sure why gm did that either. Maybe to try and push the coolant through faster or something, I dunno, but at 284* you should have the car shut off already anyways, lol

[Hib Halverson]

Re: Idle?

Idle speed is not adjustable. It also does not vary with temperature except in the very early stages of warm-up.

If your idle is 1200 rpm, the engine has either been improperly modified or you have a vacuum leak.

The factory Service Manual has good troubleshooting instructions for improper idle speed. You might take a look at that.

Is the check engine light on?

[camaroz87]

Re: Idle?

sometimes the idle will jump from 900 to 1200 but since ive owned the car its always been steady at 900 and usually cars dont idle that high? i dont want to bring it to a shop because of the idle