Misfire HELP
01-05-2013, 06:40 PM
#1
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Year: 2000
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Misfire HELP
I work at a service station with three mechanics; I am not one. I have had a 6th cylinder misfire for quite some time now. I have replaced the spark plugs, installed an Ignition Coil, and done a compression test; yet, it continues to misfire almost every time I drive more than 15-20 miles or so. Sometimes it misfires at random times but rarely. I love my Jeep, I have put almost a grand into it since I bought it. I have fixed everything except for this aggravating misfire. The mechanics at work all recommend that I do different things, but I would like to get the opinion of other Cherokee owners before I spend any more money.
01-05-2013, 06:44 PM
#2
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Try swapping the injector with one from another cylinder, see if the misfire stays or follows.
Seems more than one oddball misfire problem with the newer 4.0's has been a bad valve spring too.
Seems more than one oddball misfire problem with the newer 4.0's has been a bad valve spring too.
01-05-2013, 07:01 PM
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Year: 1998
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+1 to this advice. Definitely eliminate the usual suspects first (plug, plug wire, injector). Mine was due to the valve springs, as mentioned. The valve spring TSB applies to '96-'99 4.0 engines.
01-05-2013, 07:04 PM
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Year: 1990 Laredo
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its pretty hard to give advice when you do not know that year or motor of the jeep.. sorry tp say... you can't always assume its a 4.0...
01-05-2013, 07:09 PM
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Try this. Worked on my friend's 99 after everything else failed, including valve springs.
Pretty easy.
Get a cup of water, preferably something like a Dixie cup.
With the air cleaner off, hold the engine RPM at 2000 RPM or higher and dribble the water from the Dixie cup, which you've pinched to look like a spout on top, into the carb or throttle body. Go slowly and the engine will bog a bit. Stop and let it recover. Repeat until the cup is empty.
01-05-2013, 07:13 PM
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It says 2000 near his avatar.
Try this. Worked on my friend's 99 after everything else failed, including valve springs.
Pretty easy.
Get a cup of water, preferably something like a Dixie cup.
With the air cleaner off, hold the engine RPM at 2000 RPM or higher and dribble the water from the Dixie cup, which you've pinched to look like a spout on top, into the carb or throttle body. Go slowly and the engine will bog a bit. Stop and let it recover. Repeat until the cup is empty.
Try this. Worked on my friend's 99 after everything else failed, including valve springs.
Pretty easy.
Get a cup of water, preferably something like a Dixie cup.
With the air cleaner off, hold the engine RPM at 2000 RPM or higher and dribble the water from the Dixie cup, which you've pinched to look like a spout on top, into the carb or throttle body. Go slowly and the engine will bog a bit. Stop and let it recover. Repeat until the cup is empty.
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01-05-2013, 07:14 PM
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01-05-2013, 10:00 PM
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01-06-2013, 08:12 PM
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So,if it only applies to '96-'99 Jeeps, my 2000 shouldn't have a valve spring issue should it?
01-06-2013, 08:53 PM
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01-07-2013, 07:40 PM
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