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Replaced heads now all it does is back fire

Tiny
FLMUDDER86
  • MEMBER
  • 2000 MAZDA B3000
  • 180,000 MILES
Truck had blown head gasket and both heads where cracked. Replaced all with new and new heads. Truck just spins over and back fires out the exhaust and intake timing was never touched. Please help!
Monday, May 6th, 2013 AT 2:56 PM

4 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Backfiring means the spark is occurring at the wrong time. That is most likely due to incorrect firing order, bad distributor cap (if it has one), bad coil, ignition module or crank sensor. You may need a lab scope to look at some of those circuits.
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Monday, May 6th, 2013 AT 4:11 PM
Tiny
FLMUDDER86
  • MEMBER
  • 3 POSTS
I checked the firing order a million times so I know that is right I am going to check sensors in the am. Truck ran before heads where replace.
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Monday, May 6th, 2013 AT 4:39 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The problem is going to be somewhere in the ignition system.
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Monday, May 6th, 2013 AT 4:42 PM
Tiny
FLMUDDER86
  • MEMBER
  • 3 POSTS
What sensor do recommend I start with?
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Monday, May 6th, 2013 AT 4:46 PM

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