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Title: Truck idles high
Post by: killakovach on January 28, 2009, 04:29:58 AM

I have a 1988 Chevy 1/2 and it idles really high.When its in park it idles kind of high, but when in drive it goes down a little bit. I just replaced the knock sensor and TPS. What else can it be??????

Title: Re: Truck idles high
Post by: RIP_K52007 on January 28, 2009, 04:43:29 AM

open hood and listen for vacum leaks around the throttle body.. and where the vacum line goes into the switch in the dash board for heater controls

Title: Re: Truck idles high
Post by: killakovach on January 28, 2009, 05:01:11 AM

ok ill do that tomorrow

Title: Re: Truck idles high
Post by: hogger79 on January 28, 2009, 04:28:54 PM

not to sure about chevys but it kinda sounds like an Idle air control my 87 mustang had same problem

Title: Re: Truck idles high
Post by: chevystudz7105 on January 28, 2009, 07:56:41 PM

my guess would be your iac (idle air control) sensor. mine on my truck went bad and when i looked at it it didnt seem like there was anything wrong. i thought it just came unplugged when mine idled high. but it ended up being broke right off where the threads end and just barely touching it caused it to fall right off.

Title: Re: Truck idles high
Post by: killakovach on January 29, 2009, 03:04:19 AM

I will deff check it out within the next few days.

WeGotMud

Projects & Parts => Garage/Tech => Topic started by: killakovach on January 28, 2009, 04:29:58 AM