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

1997 Buick Lesabre

Tiny

maxac

October, 3, 2012 AT 1:50 AM

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

16 Answers

Tiny

saturntech9

October, 3, 2012 AT 2:19 AM

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

Tiny

maxac

October, 3, 2012 AT 2:53 AM

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

Tiny

maxac

October, 3, 2012 AT 2:54 AM

Do you think my lifters are over pumped?

Tiny

saturntech9

October, 3, 2012 AT 3:42 AM

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.

Tiny

maxac

October, 3, 2012 AT 3:47 AM

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

Tiny

saturntech9

October, 3, 2012 AT 3:57 AM

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

Tiny

maxac

October, 3, 2012 AT 4:24 PM

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

Tiny

saturntech9

October, 3, 2012 AT 11:07 PM

Have you performed a compression test yet?

Tiny

maxac

October, 4, 2012 AT 12:02 AM

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

Tiny

saturntech9

October, 4, 2012 AT 2:31 AM

How did it run before you replaced the gasket?

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