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After replacing the head gaskets, engine cranks and backfires, but does not start?

Tiny
NEISWONGERSHAWN
  • MEMBER
  • 2000 PONTIAC GRAND AM
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
I changed the head gaskets, cleaned the engine block pit, new oil, new oil filter, new coat, new spark plugs, new coil pack and wires, but when I go to start it, it kind of backfires first, then doesn't start. What is wrong?
Monday, March 13th, 2023 AT 5:48 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,942 POSTS
It could be you just need to let the engine sit for a day to allow the lifter to bleed back down to the proper adjustment but if you please shoot a quick video with your phone so I can hear the engine cranking over I can tell for sure what's going on. You can upload it here with your response.
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Tuesday, March 14th, 2023 AT 10:54 AM

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