I CHANGED INTAKE GASKETS ON 97 3800 AND NOW IT WILL START AND BACK FIRE AND DIE?

  • Tiny
  • maxac
  • 1997 Buick Lesabre
  • 99,000 miles

Ive checked plug wires, air leaks and all my sensor plugs.
i can force it to run a few seconds by throttling.
all I get is jerking, spitting and a backfire at the end.
fuel pressure is 37psi. DTCs 0171, 0300
i made a donation for this question as "maxair" moments ago

Wednesday, October 3rd, 2012 AT 1:50 AM

16 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,821 posts

Did you get all the push rods placed in the right place when you put it all together?

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Wednesday, October 3rd, 2012 AT 2:19 AM
  • Tiny
  • maxac
  • Member

Yes I was able to see the lifter tops
how did you know I remove them?

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Wednesday, October 3rd, 2012 AT 2:53 AM
  • Tiny
  • maxac
  • Member

Do you think my lifters are over pumped?

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Wednesday, October 3rd, 2012 AT 2:54 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,821 posts

When do the gasket you would remove the push rods. The lifters could be over pumped I helped some one else a while back with a similar problem. That turned out to be over pumped lifters.

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Wednesday, October 3rd, 2012 AT 3:42 AM
  • Tiny
  • maxac
  • Member

I ve definatley seen water in oil over pump lifters.
Ill find out in morning

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Wednesday, October 3rd, 2012 AT 3:47 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,821 posts

When the lifters are taken out and put back in they can over pump just from. That.

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Wednesday, October 3rd, 2012 AT 3:57 AM
  • Tiny
  • maxac
  • Member

I checked all twelve and can twist at least one per cyl with my fingers easily.

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Wednesday, October 3rd, 2012 AT 4:24 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,821 posts

Have you performed a compression test yet?

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Wednesday, October 3rd, 2012 AT 11:07 PM
  • Tiny
  • maxac
  • Member

I did compression check. They all fall between 165 and 185
the last one I checked was 185 and it was one of the ones doing
the backfiring, #5. I didnt remove any rockers or pushrods on
the front head 1, 3, 5

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Thursday, October 4th, 2012 AT 12:02 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,821 posts

How did it run before you replaced the gasket?

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Thursday, October 4th, 2012 AT 2:31 AM

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