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

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

16 Replies

Tiny
SATURNTECH9
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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
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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
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Do you think my lifters are over pumped?

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Wednesday, October 3rd, 2012 AT 2:54 AM
Tiny
SATURNTECH9
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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
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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
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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
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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
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Have you performed a compression test yet?

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Wednesday, October 3rd, 2012 AT 11:07 PM
Tiny
MAXAC
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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
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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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