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James Vaughn

James ... 2/9/2012

2001 Pontiac Grand Am SE1 6 Cyl 3.40L


Crack in upper plenum

Replaced head gaskets along with updated intake gaskets then fuel pump. Car remained hard to start and got worse after fuel pump replacement. I found 2 cracks around the bolts on the passenger side of the plenum. Any one know how to check for vacuum leak i.e. what tool to use, where to plug it in and what the reading should be? I'm confident this is my problem and I know how it happened I just need the specifics.

2 Answers

Spoon Sports

Spoon Sports 2/13/2012


HouseCallAuto 2/13/2012

Spray carb cleaner at the crack and see if the engine reacts to that. The vacuum leak will suck in the carb cleaner and the engine speed will change. You could even pour water over it from an anti-freeze container and a bad vacuum leak could stall out the engine as it sucks water in.

By the way, what fault codes are stored? You must have a code reader if you did head gaskets, right? Are you certain that you put back all the pushrods without mixing them up - the intake and exhaust pushrods are different lengths, you probably know that.


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