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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-28-2005, 03:52 PM   #1
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Default Backfire after replacing lower intake gasket 99 Malibu 3100

I know this is a Bonneville forum, but being there are some similarities between 3800 and 3100, and you guys have always been helpful and I'm kinda screwed at the moment (I've had the car for 3 days so far), I'm asking for any suggestions.

I replaced the lower intake gasket on a 3100. I've done a ton of these, so I do know what I'm doing. After putting everything back together, I have a backfire through the exhaust on cylinder #2. Keep in mind, on the 3100 you have to take the pushrods off to get the lower intake gasket off. I've swapped pushrods, rocker arms, and lifters between cyl #2 and cyl #6, and the backfire remains on cyl #2. I've done a compression check, #2 holds 180, #4 holds 120, and #6 holds 180. It'* been suggested that I may have mixed up a couple pushrods, but being that my compression on #2 is 180, it doesn't look like I bent a valve.

ANY suggestions are welcome, it'* been 3 days and my customer isn't very happy.
'94 Bonneville SLE | 266K miles
CAI - K&N cone filter - polished intake runners - 140 amp alternator - 2.5" exhaust - Magnaflow hi-flow cat - Magnaflow dual outlet muffler - 106K on engine and transmission - Sold 1/14/07

94 VW Jetta - 151K - 2.0 - 5 speed - Ghetto black steelie wheel mod - Techtonics 2.25" cat-back system
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