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?

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'03 KJ "Rocky Mountain Edition" 3.7L
K&N Intake
Magnaflow Cat-Back
Yokohama Geolander AT/S (Liked the Toyo Open Country AT's better though.)

what code #? did you spray the engine bay when you were washing? give us more info so we can help.

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L.O.S.T. #225019
2003 Sport 4x4
Patriot Blue w/ trail rash
Flex-Zilla 4" Lift
TrailRash hi-lift mounts
Other stuff you wish you had

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.

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02 Liberty Limited
Silver Outside & Taupe Inside
Heated Seats, Sunroof & Infinity speakers
USA Spec I-Pod adaptor, Mopar Sub, Garmin GPS
Tow Package, Select-Trac
Rock Rails, Tow Hooks

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.

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02' KJ Limited/Frankenlift I HD Coils
245/75 Big Foot A/T's on Soft 8's
EBC Greenstuffs 7000
K&N Air Filter
Full set Mopar skids
Sirius Sat Radio
Cheapa$$ Subwoofer
Custom pinstripes:)

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

X2. (except I use Amsoil Power Foam).

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Illegitima Non carborundom!

can't pull the P code using the ignition on/off trick? this would show which cylinder.

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Jason
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buy the code reader....it'll come in handy and all your friends will love you for having one when they need it!

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05 Black Rocky Mountain Renegade
245/75-16 MT/Rs
Rusty's Air Tube w/K & N 9" filter
Mopar belly-armor
Rusty's/OME/isolators and locknuts
http://s209.photobucket.com/albums/bb133/jelohead/

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.

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2002 Jeep KJ Sport 3.7L 4x4

245/75-16 Mastercraft Courser HSX, 16x7 Cragar, 2" OME MD Lift, ARB Bumper
AEM Brute Force Cold Air Intake, Flowmaster Super 44 Muffler

Currently working on: Full service on transmission & bed-lining ARB bumper

viewtopic.php?f=43&t=84650

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.

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2005 CRD "Ol' Blue"
Red Ryder carbine-action, two hundred shot range model air rifle with a compass in the stock and this thing which tells time.
My build page- RL Komodo Rear and TJM Front Bumper, armored, lifted, JBA Steel D30, 4.10s and ARB air lockers.

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.

I noticed a few oil change places offer code reading service. Check out Pro oil and lube in Ontario.

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2002 Libby Limited Mall Crawler with occasional fire road hustle.

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

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2006 Renegade. Completely stock.

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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'03 KJ "Rocky Mountain Edition" 3.7L
K&N Intake
Magnaflow Cat-Back
Yokohama Geolander AT/S (Liked the Toyo Open Country AT's better though.)

Here you go this may help

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“You cannot solve a problem from the same consciousness that created it."

“Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.”