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Problem Reported: Check Engine Light due to cylinder #3 misfire
May 27, 2010, 11:09 AM
<p>A <a id="ce_5700" class="ct_auto care advice tooltip" href="/symptoms/check-engine-light">Check Engine Light</a> may illuminate indicating a "Cylinder #3 Misfire." This normally occurs in hot weather after the vehicle has been driven, parked for ten to twenty minutes, and then restarted. Heat from the exhaust vaporizes fuel inside the #3 fuel injector and causes the misfire. Installing an insulator sleeve normally lowers the temperature enough so the fuel will not vaporize.</p>
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Comment: Check Engine Light On
June 21, 2017, 01:45 AM
I had the same situation at about 150k mi (just went over 200k!) I was chasing switches and connectors, Throttle body position sensor, all four O2 sensors, coil rack, camshaft position sensor, engine coolant temp switch, cleaned injectors and fuel line, valve cover line to the throttle body area, etc. Every thing that could be replaced except for the camshaft sensor that cannot be swapped out. I think it's behind the trans bell housing and firewall. It seems that all of the items mentioned above start failing at 150k. I didn't feel to bad about the cost involved, because it's all good now, and no probs for 50k. I found that once a particular sensor goes bad, the PMC makes adjustments to help alleviate the problem, and that might include automatic adjustments to the #3 cylinder injector because it thinks the fuel mix is too rich or lean. It won't run normally anymore because it goes downhill trying to get back to "normal". Do you recall if the check engine flashed on and off at anytime? When flashing it's saying stop right now, this very instant and repair me , or I'll make your life hell. The flashing light goes out after awhile and it's back to just the non flashing CE light. If you continue to drive after that, thinking things are back to normal, you've just fried the catalytic converter and they need to be replaced. Hopefully all the components that you installed will still be good. Clean out the TB intake area. It's probably dirty all hell. Check vacuum lines too. Here's the kicker: While I don't advocate using chemicals to clean inside the engine (most of that junk will eat gaskets and o rings, etc ), I did use "Seafoam" as a cleaning agent, and it actually worked. Take your jeep out to some very rural place, or behind Target, etc. Because after it starts working It's going to look like you've started a bonfire of plastic. Thick black smoke. The procedure takes about 10 minuets, and that should give you the time needed to get outta there before the fire trucks arrive. I might have missed a thing or two because it was 3 years ago for me,