Rough idle, check engine light
#1
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#4
Originally Posted by PickupMan92
Hey Bob,
I have a CEL reading the same codes. I've changed sparkplugs and put a new MAF on and still the same codes. Can an iol change place check my fuel pressure? or any other ideas on what I can do?
I have a CEL reading the same codes. I've changed sparkplugs and put a new MAF on and still the same codes. Can an iol change place check my fuel pressure? or any other ideas on what I can do?
Have the fuel pressure checked - you could have a weak fuel pump, plugged fuel filter or a bad pressure regulator. I would guess that an oil change place would not have the special fuel pressure gauge for that. A dealer, or possibly an independent, would have it, though.
Tired or contaminated O2 sensors can cause this by misreading the mixture. There's no easy home test on these except to swap them out.
#6
I figured out the problem. There is a vent on the back of the drivers side valve cover that I believe is the PCV valve. Two tubes come off of it and route around the back of the engine and connects to the throttle body on the passenger side. The larger of the two tubes has a rubber 90 degree bend in it right before it enters the throttle body. This rubber piece had a hole in it. It looks like it was eaten through from the inside. I replaced it with a cut down piece of heater hose with a 90 degree bend that was the same diameter at the original piece. I started it up and it idled beautifully. After resetting the computer, the check engine light went away and hasn't returned.
#7
I have the same problem, but no CEL. I've replaced the IAC and the same piece of tubing as Snowgoak, but no difference. My symptoms seem to only arise after driving for an extended period (20 minutes or more), usually when I enter the parking garage at work. I stop, shift into reverse, and when I back into my parking space it feels as if the truck is going to die. The tach will drop below 500 RPM, then bounce up to about 1200. When I am driving it is fine, although the idle is high (around 1200 RPM) until the engine is up to temp. Any suggestions before a costly trip to the dealer?
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