Horrible Misfire Now No start - JeepForum.com

 
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post #1 of 8 Old 10-23-2011, 05:32 PM Thread Starter
Noahkk24
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1990 XJ Cherokee 
 
Join Date: Oct 2011
Location: Atlanta
Posts: 10
Horrible Misfire Now No start

Was on the highway and noticed the car jolt for a second when I tried to accelerate. Tried again & same result. I immediately get the car off the highway (Luckily I'm close to home) and take the street way. I notice that when at idle there is almost no real sign of any problems or serious misfiring.

However, when I gave the car gas whether in drive or neutral there was serious misfiring once the car got to 1500rpm+ and it would not let the motor rev much past that at all. Was able to limp home and now, of course the car wont start. It will crank all day but just won't turn over...Help would be appreciated as I have NO clue where to start!!

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post #2 of 8 Old 10-24-2011, 11:53 AM
Danny0717
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1998 ZJ 
 
Join Date: Oct 2011
Posts: 31
What motor n type of jeep? Not sure if u have heard about the famous pcm problem.
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post #3 of 8 Old 10-24-2011, 03:03 PM Thread Starter
Noahkk24
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1990 XJ Cherokee 
 
Join Date: Oct 2011
Location: Atlanta
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4.0 Liter...Just changed the CPS
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post #4 of 8 Old 10-24-2011, 04:05 PM Thread Starter
Noahkk24
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1990 XJ Cherokee 
 
Join Date: Oct 2011
Location: Atlanta
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OK, so I resat the plugs on the distributor cap and moved the CPS a bit (The top bolt I used to replace does not fit in perfectly, I have the correct bolt so I'll put that in later on) BUT, it started so my problem has been narrowed down to 2 possibilities. Either the distributor cap is going bad or the CPS is not grounded well...

Either way it goes, the idle is still pretty rough but not horrible like it was...hmmmm
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post #5 of 8 Old 10-24-2011, 08:25 PM
Danny0717
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1998 ZJ 
 
Join Date: Oct 2011
Posts: 31
I'm sure you did ur homework. But r u positive the firing order is correct too? Also is clean that throttle body up nice. And clean where those sensors sit by it. Mine was rough n black n I cleaned mine up nice and it leveled out nice. U have any check engine lights on?
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post #6 of 8 Old 10-24-2011, 08:42 PM
Boodyrider
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1997 TJ Wrangler 
 
Join Date: Feb 2008
Location: Maryland
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check distributor shaft for play. There should be little or no wobble. bad wobble means new distributor time.

97 TJ Sport - 4.0/HP D30 w ARB/8.8 w LS/4.88s; 35s and flat fenders on 2.5 lift

84 CJ7; frame off restoration in progress.

The technical advice you get from me here is worth exactly what you paid me for it. Warranty issues will be reimbursed at double what you paid me for the advice.
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post #7 of 8 Old 10-25-2011, 02:32 AM Thread Starter
Noahkk24
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1990 XJ Cherokee 
 
Join Date: Oct 2011
Location: Atlanta
Posts: 10
The firiing order was actually wayyyyy off...I got that straightened out, I got it running but decided against driving it until I clean up the few other side issues there obviously are. Thanks for the help guys!
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post #8 of 8 Old 10-25-2011, 06:05 AM
Danny0717
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1998 ZJ 
 
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Posts: 31
Glad I could help.
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