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Old 05-23-2006, 08:03 AM
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Question Hard starting, rough idle, with CEL

This morning I started my 2001 Sport (6cyl.). The weather was cool and damp and it was hard starting. Once I got it running it was extremely rough, appear one cylinder was misfiring.

I shut it down and checked the codes, no codes appeared, but the CEL is still lit. I restarted it and now it runs normal. Any ideas? Also a couple of months ago it did something similar.


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Old 05-23-2006, 09:50 AM   #2
coilovers are damn flexy
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How many miles do you have on your Jeep? It may be time to change your spark plugs. Have you used a good injector cleanor lately? Put a can of Barrymans fuel conditioner in your fuel tank the next time you fuel up. Got to keep your fuel line, and spark plugs clean.

And by the way, welcome to the Forum, glad you found us. There are a lot of knowledgable people on this forum, and I am sure someone else will give some more ideas on this, if this does not help your situation.

I used to wheel where the Manchester Airport is now. It used to be a great place to vent.

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Old 05-23-2006, 10:17 AM
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I have 70559 miles on the Jeep. I was thinking to replace them. I will go out to get the injector cleaner today along with replacement plugs. I have had it since 39000 miles.

Thanks. I am glad to be here. I used to live close to the runway of the airport right under the landing path.

Thanks for the info.
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Old 05-23-2006, 11:15 AM   #4
Knows a couple things...

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Since pretty much all gasolines sold today have healthy amounts of fuel injector cleaning additives added, I really (!) doubt your fuel system or fuel injectors are dirty and need cleaning.

As bluvikng suggested, I'd change your spark plugs but with your engine's mileage I'd also install a set of new ignition wires. Just make sure to avoid those gimmicky "performance" or "low-resistance" ignition wire sets as they don't improve the TJ's engine performance but they do cause noise on your radio. Plus most of them are manufactured with no thought to longevity so the next time you change plugs, they pull apart and can't be put back together again. Your best bet is the ignition wiring set sold by the local Jeep dealer as they are excellent quality that are made so they don't cause ignition noise in your radio.

Good luck, probably nothing more than a bad sparkplug or perhaps one of the ignition wires is breaking down and allowing the spark to perhaps jump through the insulation to the block or another spark plug wire.
When you have a choice, buy American.
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Old 05-24-2006, 12:26 AM
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Thanks for the diaganostic tips. I know I can replace the plugs, but I cannot replace any wires. I believe I have the spark coil rail. I don't have a distrubutor or any visable plug wires.

Looks to be similar to the system I had on a 2001 Mustang, each plug had a small coil on it, and only had to be triggered by the computer by 5volt signal.

Thanks again.

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