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Thread: Truck has low idle/knocks off
06-18-2010, 01:14 PM #1
Truck has low idle/knocks off
For the past two weeks now my truck has been only idling around 300-400 rpms where as before it would idle at a smooth 900-1000 rpms. Also if I am driving and come up to an intersection or a stop light, as I slow to a stop the truck will sometimes knock off completely because it begins to try and idle so low. So basically I am asking what you might think the problem is with my truck. Friend of mine told me it could be an idle sensor but I want to hear some other opinions before replacing it.
Thanks and all the truck info is in the sig.
2003 Silverado 1500
V8 4.8L 294ci
2 inch Pro Comp Leveling Kit
3 inch Rough Country Lift
33 inch Nitto Terra Grapplers
5% Tint All Around
2 12" Kenwoods
06-18-2010, 01:22 PM #2
Is the CEL on??? And the Idle Air control valve, can be cleaned.. Most likely there is a chunk of carbon built up in it.. So you remove it and clean out the passages..and put it back on, and reset youur computer..
If the CEL is on you will want to check the codes before you do anything however...Mike
1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).
2009 Saturn Aura XE (wifes car)
2011 F-150 Crew 4X4
"Hold it to the floor till you see God.... Then Brake!!!!"
06-18-2010, 04:14 PM #3
Pull the vaccuum line off the fuel pressure regulator on top of the motor and see if you have gas coming from it. If you have fuel present the regulator is bad.
06-23-2010, 01:16 PM #4
06-23-2010, 11:45 PM #5
Ok the CEL is the Check engine light.. Sorry... And the IAC is mounted on the throttle body....
06-28-2010, 03:55 AM #6
06-28-2010, 04:28 AM #7
No problem.. You might want to consider doing a seafoam treatment.. If you search the forums there is a ton of reviews and info on it.. It might help to get it running even better.
06-29-2010, 01:58 PM #8
yeah i'll have to do that, seafoam is good stuff. Used in all of my previous bikes and keeps them pristine.
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