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Check Engine-cylinder 3/4 Misfire
Posted 29 February 2004 - 07:54 PM
97 Leg. OB
I replaced headgaskets back over the summer and everything has been good for the most part except: The car had it's moments of kicking on the Check Engine light a few months after the repair. I went to autozone and rented an ODB Scanner and read the codes: cylinders 3/4 misfire. Funny, when the light came on, I was doing 80 and the car didn't seem to skip a beat. Anyway, I reset the code and it kicked on about 30 miles later. I got out, pushed the spark plug boots a little tighter (1 actually seemed to slightly click) and got back in. reset the code and it's been A-OKAY for about 4-5 months. Just recently, the code kicked in again-same thing with cyl. 3/4. I drove it for a couple days until I could get another scanner and, behold, the computer cleared itself! No more code..................for about 20miles. Check Engine, AGAIN, at highway speed and no skip. I drove home, applied some antiseize and reseated all the boots again from plug to coil. Unplugged battery, reset code and VOILA. Clear. Now, I haven't driven it much since but I'm on the edge waiting to see my old friend CHECK ENGINE sometime in the future. Any ideas about the cause? I know I can try new plug wires, plugs, etc. because it may just be some random short but I'm trying not to acquaint mr. VISA with a repair bill this month...and I'd like to know what's behind it rather than stabbing at replacing 1 part at a time..anybody have similar issues?
somebody buy my OB
Posted 29 February 2004 - 08:05 PM
Posted 29 February 2004 - 08:10 PM
Head gasket job was at 138k,
Plugs have about 5-7k
wires are probably stock original.
Posted 29 February 2004 - 08:13 PM
Posted 29 February 2004 - 08:29 PM
Posted 29 February 2004 - 09:31 PM
Cyl 3 and 4 fire off the same half of the coil pack.
I'd swap wires 3 and 1. And 4 and 2.
If you get a 1/2 cyl misfire, then you know it's the wires.
If it stays with 3/4... it could still be wires, but might be the coil pack. They sometimes develop a small crack that can do things like this from what I've heard.
I have a 97 OB as well. Original coil pack (I think). But I changed the wires to Magnecor a few years back. If you have never changed the wires, you are due. OEM wires are fine.
Posted 01 March 2004 - 12:53 AM
Posted 09 March 2004 - 02:24 PM
Posted 22 March 2005 - 09:20 AM
I'm tired of spending money on this engine light. Any other cheap suggestions?
I would check the wires first, I had the same problem and my #4 wire was shorting out by the boot on the plug end, which in turn took out my coil pack.
Posted 22 March 2005 - 09:30 AM
I would pull the codes to see which cylinder is misfiring and see if the compression is lower in that cylinder.
If that doesn't work I would try swapping the injector from a cylinder that is working to the one in question.
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