Within the past 2-3 weeks, I've noticed that my car idles between 600-950 RPM--almost to the point of the engine cutting off. I'm worried of the worst--blown head gasket or piston rings. I will do a compression test soon to rule this out (or not).
Has anyone had this problem before? I don't know if this is an ignition issue or a sign of a more serious engine problem.
___________ Kon C
"Sometimes, a man has to do what a man has to do."
#34542, "RE: Rough idle..." In response to Reply # 0
Can you smooth it out with your power tuner? If not, I'd suspect the plug wires first. Watch your timing with a datalogger. If it's all over the place at idle (-5 to +20) like an o2 signal, it's probably the wires. That's what mine was anyways...
Greg
'19 Genesis G70 3.3t AWD '88 Chrysler Conquest TSI
#34545, "RE: Rough idle..." In response to Reply # 3
I don't know what's going on. This morning the car idled roughly (rpm fluctuates up and down), then when I got home this evening the car idled very normal--it held steady at 900 RPM.
Jay Curcillo has an extra IAC. I'm gonna swap that one in just to see what happens. Also, I will do a compression test this weekend (I'm not too anxious about that though).
Everything else is good: coil, spark plugs, cables. No blow-by. Normal oil consumption. I'll keep checking. Thanks, and keep the ideas coming guys!
___________ Kon C
"Sometimes, a man has to do what a man has to do."
#34546, "RE: Rough idle..." In response to Reply # 0
Do you get any CEL's? Do you have the EGR blocked off by chance? When my car's ecu does the EGR test, it closes off the IAC, and looks for the airflow from the EGR. Well i have the egr blocked off, and when the ecu does this test, my car will idle like crap, almost ready to die out. Every time it does this, it throws that EGR insufficient code CEL, so i know its that. Just thought i throw that out at ya..Also, by rough idle, do you mean jerky, stalling out idle, or just rpm fluctuation, like it doenst stay still? I'm still thinking its your IAC, but who knows..
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
Michael 99gs hrc stage 5000 SOLD... 2004 Honda Accord V6 (240 hp)stock what other car should i buy?? hmmm Car info & pictures at http://www.cardomain.com/memberpage/520269
#34554, "RE: Rough idle...problem found." In response to Reply # 12
I finally found the problem--by accident I jacked up the car to relocate my FPR and fuel line hoses, and found that a vacuum line goes from the intake manifold to the (EGR accumulator box?) the black box behind the intake manifold was just dangling there.
Also, I saw my O2 sensor wire was pinched (it was crushed) under my upper strut t-b mounting plate; and I had just put this on about two weeks ago--when the intermitten idle problem began. It was either one or a combination of the above that caused my idle problem.
I appreciate everyone's tips and suggestions. However, I'm still going to do that compression test. It's too soon to tell now, but the car seems to idle fine.
___________ Kon C
"Sometimes, a man has to do what a man has to do."
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