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Unread 04-13-2011, 08:00 PM   #1
enjoithis
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1999 WJ 
 
Join Date: Mar 2011
Location: port jefferson, ny
Posts: 47
Question Random Misfire - What else can i fix!?

I have a 99 Grand Cherokee Limited, v8 with 160k miles on it
I continue to get codes P0202 -0207

So far I have changed injectors, throttle position sensor, fuel filter, and spark plugs. The issue is very intermittent, it seems to drive fine for the first 5-10 minutes every time, and then it starts to misfire badly. It will also go away after driving for some time, and randomly come back again. Any suggestions?

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Unread 04-14-2011, 03:37 AM   #2
devis
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2000 WJ 
 
Join Date: Feb 2011
Location: Concord, CA
Posts: 44
I've experienced the same exact thing on my Infiniti J30. At close to 200k it started to behave like so... didn't pass smog, i was told to replace the O2 sensors. That, along with a tuneup brought it back to normal.
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Unread 04-10-2012, 12:51 PM   #3
mybabyjasper
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1996 XJ Cherokee 
 
Join Date: May 2009
Location: Bordentown, NJ, New Jersey
Posts: 13
I've had the same problem in my 96, but I changed O2 sensors and the codes still keep coming back intermittently (changed spark plugs, wires, tailpipe, checked cat)
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Unread 04-10-2012, 04:47 PM   #4
FrankU
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2004 WJ 
 
Join Date: Nov 2011
Location: Babylon, NY
Posts: 190
Had a similar problem with a Chevy Suburban. It ended up being the wires.
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Unread 04-10-2012, 05:05 PM   #5
wjjeeplkstevens
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2001 WJ 
 
Join Date: Jul 2011
Location: Lake Stevens, WA
Posts: 132
I had a similar issue on my jeep a when i first got it, could not find the source of a misfire on cyl 7 code. After I finally gave up replacing things myself (plugs, coil packs, fuel injectors etc.) i took it into the shop and after doing a compression/leak down test they determined it was a burnt valve... a full head job and $1500 later she purred like a kitten again (not that it really ran that rough before, just a slightly rough idle and the check engine light...) I hope this is not your case, but i thought i would throw that out there anyway...
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Unread 04-10-2012, 05:49 PM   #6
mybabyjasper
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Join Date: May 2009
Location: Bordentown, NJ, New Jersey
Posts: 13
Kj

Quote:
Originally Posted by wjjeeplkstevens View Post
I had a similar issue on my jeep a when i first got it, could not find the source of a misfire on cyl 7 code. After I finally gave up replacing things myself (plugs, coil packs, fuel injectors etc.) i took it into the shop and after doing a compression/leak down test they determined it was a burnt valve... a full head job and $1500 later she purred like a kitten again (not that it really ran that rough before, just a slightly rough idle and the check engine light...) I hope this is not your case, but i thought i would throw that out there anyway...
Oh dear God I hope not, but it's looking like I'll have to take it in. A similar thread said check the PCM and there's a YouTube vid for how to fix it... That'll be my first (sixth) check, then it's to the shop (luckily we have a jeep specialty shop by me called No Excuses).
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Unread 10-10-2012, 06:30 PM   #7
dielawn
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1999 WJ 
 
Join Date: Jul 2012
Location: Indianapolis, IN
Posts: 34
What ended up being the problem?
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Unread 10-10-2012, 10:24 PM   #8
mybabyjasper
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1996 XJ Cherokee 
 
Join Date: May 2009
Location: Bordentown, NJ, New Jersey
Posts: 13
It ended up being a cylinder/valve problem. With it being a 96 and given me such a good run, I'm not spending the $2G to fix it. Small issue, too much labor to get to :-(
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