What make my car backfire while trying to start it up?

Asked by Jul 14, 2015 at 01:11 AM about the 1972 Oldsmobile Cutlass Supreme

Question type: Maintenance & Repair

After the car starts it run great and idle good.  But does not have the power that it should have with a 350 rocket engine.

6 Answers

63,355

Sounds like it may be out of timing,weak power and backfire is sign of advance timing,meaning flooding it self,bogging out,check the timing.

1 out of 1 people think this is helpful.
40

Check ur wire mite be cross

1 out of 1 people think this is helpful.

Thanks this helps a lot will this allow the 4 barrel to open up as well?

40

Or one of ur wire mite have a split n it. Or ssitting on the manifold..

18,230

Also check fuel filter and clean carb with carburetor cleaner.

3,825

If the problem started all of a sudden its quite likely that your timing chain is loose and has skipped a tooth. The only fix for that is a new chain and gears in the front of the engine. Takes the better part of a day if you're a do it yourselfer. You'll need to rent a harmonic balancer puller, but otherwise hand tools will do the job.

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