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Turns over, not firing


 
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bcgooner
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Joined: 04 Sep 2006
Location: The Great White North

PostPosted: Mon Jun 28, 2010 10:36 am    Post subject: Turns over, not firing Reply with quote

Hi,
My 87 Cherokee (4.0l) has gone and died on me. Two days ago I had some trouble starting it - it turned over and fired, but ran very very rough with a bit of light blue smoke. Eventually it smoothed out and ran just fine.

Later that day I was driving along and when I tried to accelerate from idle at an intersection, it again ran very rough, barely keeping going until I floored it which again got it running smoothly. Since then it has been running fine so I chalked it up to a temporary glitch and crossed my fingers.

Today it would not start at all: it is turning over normally, but not firing. I had a similar problem (turning over, not firing) a few months ago, but replacing the oil pressure sender seemed to have fixed it. Now I'm not sure...

At first I was thinking it was perhaps a timing issue, but it would make no sense to me for that to appear and then go away. Now I am thinking either electrical or fuel. The fuel filter was last replaced a couple of years ago, but I suspect that if it is fuel, it would be a pump/pressure problem. Am I heading in the right direction there?

Any suggestions?

Many thanks
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bcgooner
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Joined: 04 Sep 2006
Location: The Great White North

PostPosted: Mon Jun 28, 2010 3:02 pm    Post subject: Reply with quote

Air filter was OK, spark was good, and there was good pressure in the rail. So I figured maybe it was the crankshaft position sensor. Jiggled a coupleof wires and a connection, and it's working fine now.

Very Happy
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Tim Hallam
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Joined: 06 Dec 2007
Location: Mt. Shasta, California

PostPosted: Fri Aug 13, 2010 2:19 pm    Post subject: Reply with quote

Check and clean your cap & rotor. Also, check to make sure that the ignition pick up below the rotor plate is intact and in place. I got stranded in a home depot parking lot for 24 hours earlier this summer because the ignition pick up fell apart due to age.. And that was in a '93. I couldn't figure out for the life of me what was going on though. Finally I found a small hunk of metal sitting in the bottom of the distributor.


Tim
_________________
The true measure of a Jeep is not where it can go, but rather, where it has been.

1986 Pioneer, 1990 Laredo, 1991 Sport, 1993 Sport & 1998 Sport.
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