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Hi – New to the forums, but not to ETCG. But, still quite a novice when it come to auto repair.
Have a 2002 Kia Sedona minivan, 181k miles. Recently had an overheat situation. Took care of the cause (coolant leak due to corroded rear heater pipes), but still having a problem.
On occasion, the engine will labor (either at idle or even when driving). It does not do this on a cold start-up, and I can drive several miles before it happens again. Sometimes it will correct itself.
My initial code was a P0350, but after testing the 3 COPs, they tested ok. I replaced all 6 spark plugs and wires. The code doesn’t automatically come up, but when I stopped & restarted the engine, while it was still happening, the engine light came on with that code.
Got a bluetooth OBD to use with Torque. Noticed when the issue happens, the computer notes the RPM at about 500 RPM above what the panel gauge will show, no matter what speed I am going (even at idle).
Are there any sensors that might create this issue? Any suggestions would be appreciated!
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See if this helps. I have a feeling your coil packs may be getting weak.
The best way to check them is when its happening and check for spark
with a tester. you can try the ohm test but the coils can check out but still
be faulty.http://www.justanswer.com/chevy/11auy-resistance-harder-juice-through-coils.html
I also think you have a coil issue. They are likely cracked inside. When it all gets warm, things expand and the crack is then a short for some or all cylinders. The crank sensor would keep it from running altogether, plus there would definitely be a code for it. I’m still thinking the coil or coils.
Ok – Thank you very much for your advice! It was indeed a coil!
I picked one up at a scrap yard for $10, and drove the van around this morning until the misfire occurred again.
Got out and pulled off the power plug to each one, and found the one that wasn’t working. Swapped it out with the one I had, and have driven it about 2 hours now, with no further problems!
I did get another code, after driving the van quite a bit (p0431), but since it seems to be emissions related, is it something to worry about? We don’t have vehicle inspections in Indiana.
I’m glad to hear you fixed it! As for the emissions thing, it won’t keep you from running but it might cost more for gas if you have to fill up more often. Aside from fixing the emissions thing, the best tips for saving gas money are changing the gas cap every 3 years, keep a clean air filter in it and never use any form of ethanol fuel ever under any circumstances. Have fun driving man.
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