2002 Pontiac Grand Prix



January, 17, 2013 AT 6:11 AM

I am not a mechanic. Learning as I go. I bought a 2002 Pontiac Grand Prix 3800 from a family member. The car has been sitting for about a year. He thought it was a blown head gasket. I changed the intake plenum valve gasket, valve cover gaskets, and the radiater. The sludge in valve covers were bad but I seen wors. It blocked the holes good. Cleaned that up. Changed oil. Drove good for five days. I changed the Map sensor to get check engine light off, which it did. Then almost immediately I heard a ticking knock. Sounds like it is coming from valve cover. It does not stop. Goes faster with speed. What should I do?Clean oil pan and pick up

1 Answer



January, 17, 2013 AT 10:41 AM

The knocking may be a bad lifter or maybe a bearing in the lower end.

Try changing the oil again to see what happens


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