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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Tazman on March 15, 2010, 12:04:00 pm

Title: Idle unsteady
Post by: Tazman on March 15, 2010, 12:04:00 pm

My 87 is stock with fuel injection.Once in a while when at idle it will fluctuate a little,enough that the oil gage moves.Any ideas on what this is and how it can be fixed?Thanks

Title: Re: Idle unsteady
Post by: Lt.Del on March 15, 2010, 12:05:55 pm

is it when it first starts up cold, or after driving a bit w/ a warm engine?

Title: Re: Idle unsteady
Post by: VileZambonie on March 15, 2010, 12:48:08 pm

Check for vacuum leaks and check the tbi base gasket

Title: Re: Idle unsteady
Post by: 1980c10 on March 15, 2010, 08:34:35 pm

Any codes? You could check your idle air control valve. Any other symptoms?

Title: Re: Idle unsteady
Post by: Irish_Alley on March 16, 2010, 10:39:25 am

Also does the volts drop any ?

Title: Re: Idle unsteady
Post by: Tazman on March 16, 2010, 11:20:17 am

It does it when warmed up mostly.Thanks for the ideas I will check those out.

Title: Re: Idle unsteady
Post by: Irish_Alley on March 16, 2010, 08:09:29 pm

The reason I asked about the volt is when my 94s alt was going up it would stop charging and the truck would run off the battery causing it to idle erratically

Title: Re: Idle unsteady
Post by: Tazman on March 19, 2010, 11:31:24 am

I will check that,I do not have an alt gage.Thanks