Question about 2001 Ford F250 Super Duty Super Cab

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My f 250 gas is not running good, the engine light never came on, i try to checkit with my tester and it says that cylinder #8 is backfiring what can i do to fix the problem

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  • Master
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First of all, I would make darn sure that cly 8 is the problem, because of what it could take to fix it. I'd unplug #8 and make sure that this action stopped the backfire. Naturally you will have a miss due to #8 will be dead, but this is just a confirmation that the tester has made a correct diagnosis. If you indeed confirm that you have a backfire in #8, there are 2 possible issues. #1 your mix on that cylinder is not correct, or #2 you have a valve issue. Knowing that the valve repair will be the most involved and costly, it will be necessary to make sure that the fuel mix for #8 is correct before you begin the task of a valve job. To test for valve leakage on that cylinder, run a compression test. If the compression is bad or low, you probably have a leaky or burnt valve and will have to have the head worked. Good luck. I hope you find this very helpful!

Posted on Nov 15, 2009

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  • Ford Master
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Try replacing the plug and wire to start with, and see how you make out.

Posted on Nov 15, 2009

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