Misfire on cylinder 1 and 6 - JeepForum.com
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post #1 of 4 Old 12-07-2010, 07:25 PM Thread Starter
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2002 TJ Wrangler 
Join Date: Dec 2010
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Misfire on cylinder 1 and 6

I just had a Jasper motor "4.0" installed in my jeep in march a few weeks ago I started having problems with my jeep running at low speeds it seems to loose power but if i get it on the freeway and get it up to the speed limit its fine. And when it does it I can turn off the jeep and turn it back on and its fine as long as I get it up to freeway speeds. The check Engine light is on an im getting misfire codes from 1 and 6.
My Mechanic has changed the coil packs, cam sensor, and checked the injectors and its still not right so he suggested I take it to the dealer to get the CPU checked and it has came up fine. I have seen this topic discussed here but no answers have yet been provided.

Thanks for the Help.

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post #2 of 4 Old 12-07-2010, 07:30 PM
Jerry Bransford
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2004 TJ Wrangler 
Join Date: Jan 2003
Location: Escondido, California
Posts: 69,058
Welcome to the forum, and for that symptom I'd probably suspect the camshaft position sensor mounted where the distributor used to be may be out of time. It takes an experienced Jeep tech maybe 20 minutes to check and adjust the timing for that particular sensor.

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post #3 of 4 Old 12-07-2010, 07:51 PM
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2001 TJ Wrangler 
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I had the same problem a few months ago, I replaced plugs, coil, cam sensor, and last not least the PCM. When I would tap on the PCM it would work fine then go to **** again so I figured it was the PCM. Installed a new one and same thing. So I started cuting the covers on all the wiring around the PCM and coil pack and found two wires near the PCM that were shorting out against each other and that was causing it to misfire.
Anyways make sure to check all your wiring before replacing everything. It might save you alot of money.
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post #4 of 4 Old 01-09-2011, 07:04 PM Thread Starter
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It turned out to be a bad motor from jasper, the valve in cylinder 1 wasn't closing all the the way a compression test of cylinder 1 confirmed this and the motor was replaced.
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