99 expy missing and running like crap...
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Junior User
Joined: Mar 2005
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99 expy missing and running like crap...
Its a 99 EB with 125k, it started missing a couple of days ago while it sat for almost 3 days straight without starting it. Got the service engine soon light, pulled the code and turned out to be cop #4, changed it out and it ran great for a day and half. Again doing the same thing missing badly and running really rough took it to my mechanic, he hooked up the comp and was showing the same cylinder #4 so he went ahead and repaced the injector on it, ran great for a day and started doing same thing. I dont know what else to do, does anybody know whats causing this help me out thanks in advance.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
Check the coolant line overhead of the #4 cylinder. They have a reputation for leaking coolant onto the #4 COP and causing #4 misfires.
Swap the #4 COP and plug with #1. That way if either is bad, it will be easier to replace if the problem comes back.
Steve
Swap the #4 COP and plug with #1. That way if either is bad, it will be easier to replace if the problem comes back.
Steve
Senior User
Joined: May 2004
Posts: 236
Likes: 0
From: Ottawa, Ontario, Canada
When was the last plug change?
My 2000 EB was running poorly and missing badly - no codes thrown though - so I bit the bullet and changed the plugs and the COP's on 4 and 8. Also changed out all the boots putting a reasonable amount of dielectric grease on them. The boot on number 3 was torn and shorting out and the plugs really needed to be changed. Runs like a champ now and mileage has improved by 1mpg mixed driving.
My 2000 EB was running poorly and missing badly - no codes thrown though - so I bit the bullet and changed the plugs and the COP's on 4 and 8. Also changed out all the boots putting a reasonable amount of dielectric grease on them. The boot on number 3 was torn and shorting out and the plugs really needed to be changed. Runs like a champ now and mileage has improved by 1mpg mixed driving.
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