502 Mpi Backfires
08-07-2010, 08:35 AM
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First you need to do a leak down and/or compression test to make sure the engine is mechanically sound. I suspect you may have burned a valve. If everything checks out mechanically, then I would look at the TPS. Good luck, and keep us posted.
Eddie
Eddie
08-07-2010, 05:08 PM
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I just went down the same path, had a intermittment backfire and started blaming Iac and tps for the prob. Did a comp test found one cyl down 20 psi and the leakdown test condemed intake valve. pulled head and had the intake seat cut and was back on the water trouble free.
I just went down the same path, had a intermittment backfire and started blaming Iac and tps for the prob. Did a comp test found one cyl down 20 psi and the leakdown test condemed intake valve. pulled head and had the intake seat cut and was back on the water trouble free.
