Mechanics

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

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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Maxac
October 3, 2012.




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

Saturntech9
Oct 3, 2012.
Yes I was able to see the lifter tops
how did you know I remove them?

Tiny
Maxac
Oct 3, 2012.
Do you think my lifters are over pumped?
AD

Tiny
Maxac
Oct 3, 2012.
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.

Saturntech9
Oct 3, 2012.
I ve definatley seen water in oil over pump lifters.
Ill find out in morning

Tiny
Maxac
Oct 3, 2012.
When the lifters are taken out and put back in they can over pump just from. That.

Saturntech9
Oct 3, 2012.
I checked all twelve and can twist at least one per cyl with my fingers easily.

Tiny
Maxac
Oct 3, 2012.
Have you performed a compression test yet?

Saturntech9
Oct 3, 2012.
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
Maxac
Oct 4, 2012.
How did it run before you replaced the gasket?

Saturntech9
Oct 4, 2012.

AD