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Backfire through exhaust

Tiny
DUSTIN ELLIOTT
  • MEMBER
  • 1989 FORD MUSTANG
  • 5.0L
  • V8
  • RWD
  • AUTOMATIC
  • 140,000 MILES
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.
Sunday, February 26th, 2017 AT 6:19 AM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
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.
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Monday, February 27th, 2017 AT 1:14 PM
Tiny
DUSTIN ELLIOTT
  • MEMBER
  • 4 POSTS
I have checked all of that. New plugs wires, distributor.
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Monday, February 27th, 2017 AT 1:40 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
New distributor too?
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Monday, February 27th, 2017 AT 5:28 PM
Tiny
DUSTIN ELLIOTT
  • MEMBER
  • 4 POSTS
Yes.
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Monday, February 27th, 2017 AT 5:41 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Any exhaust leaks and how is the mixture? Very lean can cause exhaust back fire.
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Tuesday, February 28th, 2017 AT 4:08 AM
Tiny
DUSTIN ELLIOTT
  • MEMBER
  • 4 POSTS
No exhaust leak smells alittle rich but the plugs say otherwise
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Tuesday, February 28th, 2017 AT 2:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,884 POSTS
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
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Friday, March 3rd, 2017 AT 5:25 PM

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