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Unread 10-15-2012, 02:11 AM   #1
Registered User
1995 YJ Wrangler 
Join Date: Aug 2009
Location: Annapolis, MD
Posts: 66
2001 WJ misfiring randomly

I have a 2001 WJ, 6 cyl, select trac, 4x4, that I bought used a few years back. Recently I have been getting a check engine on the regular. The one code I expect every time I see the light is "clutch torque converter solenoid circuit" (I don't recall the error code)... I can't get any answers as to what the heck that is about. Honestly I have no idea what that part is or does.

The second code I get is less often and occurs when the engine starts running rough. It is a misfire, or several misfires. I have replaced the coil 3 times (two of those times professionally), replaced the spark plugs, and had the computer software upgraded by the Jeep dealership. The dealer's mech told me that it was randomly misfiring in sequences. One test would return misses on 2, 4, and 6 then the next test would return with misses on 1, 4, and 6 then yet another test would give misses on 1, 3, and 4. It was never the same cylinders missing, but always multiple. It was fine when we left the dealer (we thought it was fixed after the upgraded software), but It still does it every once in a while. Most recently I went on a road trip from San Diego to Sacramento to Salt Lake City and back to Sacramento. Almost 2000 miles in a week. Less than an hour away from Sacramento on the return trip, the engine started running very rough, shaking, and the check engine light began blinking without stop. We pulled off, I popped the hood to find no obvious issues, checked fluids, then turned off the engine.... Waited a minute.... Turned it back on and bam, no more problems and the light stopped blinking, though it was still on. We made it the rest of the way to Sacramento without an issue.

When I got back into my driveway in Sac, I checked for codes and I got several:
P0300 "random/ multiple misfire"
P0301 "misfire cyl 1"
P0302 "mis cyl 2"
P0303 "mis cyl 3"
P0304 "mis cyl 4"
P0305 "mis cyl 5"
And P0740 "clutch torque converter solenoid circuit" (I don't know if this is the number I had been getting in the past. I know there are a couple different codes of the same description for this model.)

I am at the extent of my knowledge/ideas and I have no faith in dealer mechs, nor the money to pay for them.

So now I go to JF... Any thoughts?


Green 95 YJ, A.K.A "Marvin The Martian" or "the Piss Wagon"

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