SPONSORED LINKS

Backfires through throttle body

Tiny
DARRYL10
  • MEMBER
  • 1996 CHEVROLET CHEYENNE
  • 200,000 MILES
5.7 liter 350 chevy pickup cranks but wont start backfires through throttle body while cranking it over?
Monday, January 30th, 2012 AT 6:33 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
It sounds like the engine has lost timing like the timing chain has jumped. Here is a guide to help you check the timing chain.

Here is a guide and the timing chain diagram below so you can see whats going on.

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

Check out the diagrams (Below). Please let us know what happens.

Cheers
Image (Click to make bigger)
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+3
Monday, January 30th, 2012 AT 6:40 PM
Tiny
DARRYL10
  • MEMBER
  • 2 POSTS
Yep the timing chain was gone! I replaced it but the engine had bent valves so I junked it, thanks for your help though.
Was this
answer
helpful?
Yes
No
Monday, January 30th, 2012 AT 6:46 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers
Was this
answer
helpful?
Yes
No
Monday, January 30th, 2012 AT 6:48 PM

Please login or register to post a reply.

Related Throttle Body Content

Throttle Actuator Bore Service
GUIDE
Throttle Actuator Bore Service
The throttle bore or throttle actuator as they are called on newer cars is used to meter the engine air intake thus controlling the engine RPM and power output via the gas...
VIEW MORE

Sponsored links