Backfire through exhaust

1989 FORD MUSTANG
140,000 MILES • 5.0L • V8 • RWD • AUTOMATIC
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DUSTIN ELLIOTT
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I get a backfire through my exhaust under a load at about 2500-3000 rpm while driving, but if I put it in park I do not have that problem. I am lost.
Feb 26, 2017 at 6:19 AM
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KHLOW2008
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When under load, misfiring can occurs when spark plug related components are faulty. It could be due to presence of oil or water. Have them checked .
Feb 27, 2017 at 1:14 PM
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DUSTIN ELLIOTT
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I have checked all of that. new plugs wires, distributor.
Feb 27, 2017 at 1:40 PM
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KHLOW2008
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New distributor too?
Feb 27, 2017 at 5:28 PM
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DUSTIN ELLIOTT
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Yes.
Feb 27, 2017 at 5:41 PM
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MHPAUTOS
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any exhaust leaks and how is the mixture? very lean can cause exhaust back fire,
Feb 28, 2017 at 4:08 AM
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DUSTIN ELLIOTT
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No exhaust leak smells alittle rich but the plugs say otherwise
Feb 28, 2017 at 2:59 PM
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STRAILER
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Hey Dustin,

I am wondering if you have a broken valve spring that is causing the issue, can you take a video of the problem and post it on you tube then give us the link so we can see exactly what it is going?

Best, Ken
Mar 3, 2017 at 5:25 PM