The 1947 - Present Chevrolet & GMC Truck Message Board Network

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- The 99-06 GMT800 Chevy and GMC Message Board (https://67-72chevytrucks.com/vboard/forumdisplay.php?f=58)

- - Engine Idle Trouble (https://67-72chevytrucks.com/vboard/showthread.php?t=374525)

omega

12-01-2009 11:00 PM

Engine Idle Trouble

I have a 1995 Suburban, K2500 with a 7.4L engine (this was the closest forum fit). When the engine is cold it idles at about 1500 rpm and when warm it is idling about 1000 rpm and will move at 8 to 10 mph on the level. There are no engine codes, have replaced the throttle posistion sensor, throttle control valve and engine coolant sensor to no avail.

Any suggestions on reducing the engine idle?

clinebarger

12-01-2009 11:43 PM

Re: Engine Idle Trouble

Vacuum leaks? Ive found that its the throttle body base plate gasket alot of the time, cracked or broken vacuum lines, leaking intake gaskets, leaking brake booster, Throttle blades not closing. this belongs in the 88-98 forum.

bwood

12-01-2009 11:46 PM

Re: Engine Idle Trouble

clinebarger beat me to it. Like he said, it sounds like a possible vacuum leak. Here is the 88-98 Group:

http://67-72chevytrucks.com/vboard/f...splay.php?f=12

omega

12-02-2009 02:29 AM

Re: Engine Idle Trouble

Thanks for the insights. I will move the post to right forum

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