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Unread 07-03-2013, 09:14 AM   #1
OzzLee
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CEL can't make up its mind.

Bought an 05 TJ three weeks ago. First Jeep. I love it....even with the death wobble....wakes you up quicker than two pots of coffee.

DW is not why I'm here. I'm here because this past week my check engine light has gone nutty. I start the Jeep and it's off. A mile or so, it comes on for 5-10 seconds and shuts back off. A minute or two later it turns back on and is flashing and dinging and waiving its arms saying "LOOK AT ME LOOK AT ME!" and after a few seconds it shuts off. Off, on, off, on, off, flashing, off, on, flashing, off.....well you get the picture.

I took it to the auto parts store to have the code read, and was told they couldn't because the light isn't on. They told me what ever problem I was having, it was quickly correcting itself. I don't notice anything wrong when the light comes on, but Jeeps are new to me.

Has this happened to anyone else? Please tell me its simple, like a loose fuse, and not something ready to explode and I shouldn't even drive it to the end of my driveway.

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Unread 07-03-2013, 12:16 PM   #2
NotURMailman
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I hate to tell you this but mine did this a few times a couple of years ago and I never figured out why. Never really worried about it though because there weren't any other symptoms.
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Unread 07-03-2013, 12:21 PM   #3
biffgnar
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Has happened two or three times to me. I think always after extended periods of driving at highway speed in heavy rain. Always assumed a sensor or something had gotten wet and didn't like it but then dried quickly from engine heat. Who knows? No consequences that I've ever been able to determine.
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Unread 07-03-2013, 04:29 PM   #4
pwmac
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Erratic CEL could be the first sign of a bad OPDA. Better check it.
Lots of fixes for that problem. Easy to check after viewing the video on page 1 of the monster thread of the subject.
Good luck, PW
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Unread 07-03-2013, 05:26 PM   #5
biffgnar
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Originally Posted by pwmac View Post
Erratic CEL could be the first sign of a bad OPDA. Better check it.
Lots of fixes for that problem. Easy to check after viewing the video on page 1 of the monster thread of the subject.
Good luck, PW
Possible, but personally the episodes I related have happened over lets say the last five years so very scattered and I'm at 136k on stock OPDA, so while checking that is a good thing if you have an 05 or 06 I dont' think it is what caused it for me.
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Unread 07-04-2013, 09:03 AM   #6
OzzLee
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Quote:
Originally Posted by pwmac View Post
Erratic CEL could be the first sign of a bad OPDA. Better check it.
Lots of fixes for that problem. Easy to check after viewing the video on page 1 of the monster thread of the subject.
Good luck, PW
I would like to extend my thanks. After finding the thread you suggested, I'm positive it is my OPDA going bad. I have the "laughing Monkey" sound, though not nearly as bad as in the video. At times it makes no noise at all. I started looking at the oil pressure gauge as well, and noticed it drop pressure and then quickly regain it again. My CEL comes on when it drops the entire way. I hadn't noticed this since it happened so quickly and I wasn't focused on the gauge.

I'm glad you mentioned this before it quit completely and did some serious damage. Cheers to you
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Unread 07-04-2013, 11:22 AM   #7
Dead_End
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Quote:
Originally Posted by OzzLee View Post
I took it to the auto parts store to have the code read, and was told they couldn't because the light isn't on. They told me what ever problem I was having, it was quickly correcting itself. I don't notice anything wrong when the light comes on, but Jeeps are new to me.
Did they tell you they couldn't hook it up with the light off, or did it not pull up any codes? The ECU should have whatever code was throwing the light stored as "pending" and should still show up on a scan tool.
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Unread 07-04-2013, 11:53 AM   #8
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Quote:
Originally Posted by Dead_End View Post
Did they tell you they couldn't hook it up with the light off, or did it not pull up any codes? The ECU should have whatever code was throwing the light stored as "pending" and should still show up on a scan tool.
X2. The code will still be readable even if the light is off.
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Unread 07-04-2013, 12:30 PM   #9
pwmac
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Cel

I believe its true that codes are set and readable when the CEL is off.

Intermittent CEL if caused by wear on the drive gears always start out as intermittent. Reason the worn gears cause slop and the cam position sensor goes in and out of the sweet spot and the ECU compensates when the tone ring/sensor moves out of tolerance.
Never neglect any kind of CEL whether intermittent or not.
PW
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Unread 07-04-2013, 12:39 PM   #10
OzzLee
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Figured it out. When I bought it, the sticker said I still had 3k miles before my next oil change. I figured it was recently serviced. Checked the oil....bone dry. Put a quart in, and it held pressure. Definitely going to keep an eye on it now that I know the OPDA is notorious for going bad.
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