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1979 Chevrolet Truck chugging and backfiring

Tiny
SI TWENTY
  • MEMBER
  • 1979 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
Engine is chugging with loss of power and when accelerating hard it backfires slightly
Monday, February 16th, 2015 AT 12:59 AM

2 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Sounds like it's misfiring. Start out checking the plugs, wires, dist cap and rotor. Change them if they have not been changed recently.
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Monday, February 16th, 2015 AT 2:12 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
If the tune up doesn't fix it I have seen the head gasket blown between two cylinders cause this problem, also I would remove the valve covers and crank the engine over without starting it to see if the rockers are all working correctly, because a flat camshaft can cause this as well. Please go over this guide to see what I am talking about.

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

Please go over this guide and get back to us.
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Thursday, June 27th, 2024 AT 6:04 PM

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