SPONSORED LINKS

Engine backfiring

Tiny
39TB
  • MEMBER
  • 1997 FORD E-SERIES VAN
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 300,000 MILES
Engine is backfiring through exhaust. Bad valve?
Saturday, June 12th, 2021 AT 3:49 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

I would start by checking the compression. It could be a valve if the compression is low.

https://www.2carpros.com/articles/engine-backfires-while-running

https://www.2carpros.com/articles/how-to-test-engine-compression

It could also be a broken valve spring. The valve may not be closing all the way and it backfires out that cylinder. I attached a picture of the valve spring for you. Once one of the coils break, the spring will not have enough pressure to hold the valve closed.

Roy
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Saturday, June 12th, 2021 AT 5:08 PM
Tiny
39TB
  • MEMBER
  • 3 POSTS
Thank you Roy, I will do a compression test before I start pulling valve covers. Lee
Was this
answer
helpful?
Yes
No
Saturday, June 12th, 2021 AT 6:37 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Let us know if you have any other questions.

Always glad to help.

Roy
Was this
answer
helpful?
Yes
No
+1
Sunday, June 13th, 2021 AT 3:34 AM

Please login or register to post a reply.

Related Engine Backfire Content

How To Fix an Engine Backfire
VIDEO
How To Fix an Engine Backfire
Instructional repair video
Backfire Repair
GUIDE
Backfire Repair
When your engine backfires it can do so in one of two ways. First and the most common way is when the engine is running a small explosion of unburnt fuel is ignited inside...
VIEW MORE

Sponsored links