LOST JEEPS :: View topic - Uh-oh Light...

Washed my KJ last night, ran fine. Went into work today and when I was leaving it started to idle rough, like it was missing. About 30 seconds later the Check Engine light came on and I shut it down. (I was still in the parking lot). Left it at work and I'm currently driving the shop truck.

This has happened before and after getting it in to the dealer for diagnosis, $265 later I was told that water had got into one of the coil modules and the removed and dried it out, and cleared the codes.

My choice is this... Buy a $100 OBDII Code Reader and find out which cylinder is misfiring and fix it myself.... Take it to the dealer, have them just read it and still do it myself.... Or just have them do all the work which at $115/hr for labour could be pricey.

Opinions? Anyone have this problem before?

I don't use a high pressure water spray in the engine bay just for this reason.

wash the engine bay when everythings cold with low pressure water and some simple green.

Author:	pg2676 [ Sun Sep 14, 2008 9:31 pm ]
Post subject:	Uh-oh Light...
Washed my KJ last night, ran fine. Went into work today and when I was leaving it started to idle rough, like it was missing. About 30 seconds later the Check Engine light came on and I shut it down. (I was still in the parking lot). Left it at work and I'm currently driving the shop truck. This has happened before and after getting it in to the dealer for diagnosis, $265 later I was told that water had got into one of the coil modules and the removed and dried it out, and cleared the codes. My choice is this... Buy a $100 OBDII Code Reader and find out which cylinder is misfiring and fix it myself.... Take it to the dealer, have them just read it and still do it myself.... Or just have them do all the work which at $115/hr for labour could be pricey. Opinions? Anyone have this problem before?

Author:	Jeep4me99 [ Sun Sep 14, 2008 9:36 pm ]
Post subject:
what code #? did you spray the engine bay when you were washing? give us more info so we can help.

Author:	sleeve84028 [ Sun Sep 14, 2008 9:40 pm ]
Post subject:
I don't use a high pressure water spray in the engine bay just for this reason. wash the engine bay when everythings cold with low pressure water and some simple green.

Author:	trailman [ Sun Sep 14, 2008 9:46 pm ]
Post subject:
Just a couple of days ago I got a bunch of muddy water everywhere in my engine bay. My buddy wanted to help me out and wash off the engine. Well he saturated everything in there pretty good. This morning when I go to start it up it idles rough and shudders. It ran fine after it got hot. I guess I was lucky.

Author:	jason thompson [ Sun Sep 14, 2008 11:48 pm ]
Post subject:	Re: Uh-oh Light...
pg2676 wrote: Washed my KJ last night, ran fine. Went into work today and when I was leaving it started to idle rough, like it was missing. About 30 seconds later the Check Engine light came on and I shut it down. (I was still in the parking lot). Left it at work and I'm currently driving the shop truck. This has happened before and after getting it in to the dealer for diagnosis, $265 later I was told that water had got into one of the coil modules and the removed and dried it out, and cleared the codes. My choice is this... Buy a $100 OBDII Code Reader and find out which cylinder is misfiring and fix it myself.... Take it to the dealer, have them just read it and still do it myself.... Or just have them do all the work which at $115/hr for labour could be pricey. Opinions? Anyone have this problem before? I am not sure about canada but here the auto parts stores do a loan a tool thing you pay for the tool and when you bring it back you get a full refund I do this for scan tools and such I have only had this issue when my TJ over heated ,same basic problem I clean under that hood all the time with high pressure but I start far back and only get close enough to get the bad stuff off Try to get the tool ,read the code, reset the code, and replace the coil pack

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Author:	CrossBones [ Mon Sep 15, 2008 12:25 am ]
Post subject:
sleeve84028 wrote: I don't use a high pressure water spray in the engine bay just for this reason. wash the engine bay when everythings cold with low pressure water and some simple green. X2. (except I use Amsoil Power Foam).

Author:	DryBones [ Mon Sep 15, 2008 2:07 am ]
Post subject:
can't pull the P code using the ignition on/off trick? this would show which cylinder.

Author:	jelohead [ Mon Sep 15, 2008 4:26 am ]
Post subject:
buy the code reader....it'll come in handy and all your friends will love you for having one when they need it!

Author:	jeepkj02 [ Mon Sep 15, 2008 4:57 pm ]
Post subject:	Re: Uh-oh Light...
pg2676 wrote: Washed my KJ last night, ran fine. Went into work today and when I was leaving it started to idle rough, like it was missing. About 30 seconds later the Check Engine light came on and I shut it down. (I was still in the parking lot). Left it at work and I'm currently driving the shop truck. This has happened before and after getting it in to the dealer for diagnosis, $265 later I was told that water had got into one of the coil modules and the removed and dried it out, and cleared the codes. My choice is this... Buy a $100 OBDII Code Reader and find out which cylinder is misfiring and fix it myself.... Take it to the dealer, have them just read it and still do it myself.... Or just have them do all the work which at $115/hr for labour could be pricey. Opinions? Anyone have this problem before? Having a dealer pull/clear the code will probably run you between $70-90, might as well buy a code reader and do it yourself. First try the on-off-on-off-on-off trick and see if a code come on.

Author:	bugnout [ Mon Sep 15, 2008 5:16 pm ]
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Hair dryer - Use a hair dryer on low setting and dry out the wires, coils connectors etc Use wd40 - Thats what its for, Water displacement formula 40. pull all the connectors one at a time and squirt. or wait until it dries out. Use some dielectric grease in all the connectors as you reassemble them.

Author:	tjkj2002 [ Mon Sep 15, 2008 6:31 pm ]
Post subject:
You should never have a misfire from a coil on a KJ after washing it,the coils are expoxied sealed.You either have a cracked coil housing and/or bad o-rings and coil boots.Might as well spend the $22 each for 6 new coil packs and be done with it.I powerwash my engine(soap and rinse) evry sunday and never,ever had a problem.

Author:	dirtywhiteboy [ Mon Sep 15, 2008 9:34 pm ]
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I noticed a few oil change places offer code reading service. Check out Pro oil and lube in Ontario.

Author:	2006 KJ [ Mon Sep 15, 2008 10:24 pm ]
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i believe autozone will plug in a read it for free. or atlesat the one around my house will. i pressure wash my engine after offroading and just try not to kill the plugs. right after i'm done soap and washing it i blow it dry with a air gun (from a compressor). just to make sure all the plugs and packs are dry and it gets rid of all waterspots

Author:	pg2676 [ Tue Sep 16, 2008 11:06 pm ]
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Bought the reader, read "Cylinder 5 Misfire". Parked it for a couple days and cleared the code tonight. Drove it home with no problems. Seems to have dried out and solved itself. Probably saved about $200-$300. Stupid question... Which cylinder is #5? Right front or left rear?

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Author:	LIV42DY [ Wed Sep 17, 2008 9:24 pm ]
Post subject:
Here you go this may help