VALVE TRAIN QUESTION

2007 Chevrolet Impala

Tiny

pos07impala

April, 14, 2012 AT 2:40 PM

I'm curious is it possible to misalighn a pedestal mounted rocker arm? My car isn't breathing right at all. And I have a pretty pronounced valve train noise from a lot of my rockers. If I pull the covers again what should I look for? On cold starts the valve train is noisy and exhaust is a loud puffing noise, no miss just noisy and a major hesitation/lack of power.

This started after doing a lower intake gasket.

Ps there's no coolant that goes through the intake manifolds

Any testing tips would be great instead of saying go to a mechanic. I'm here cause I would Love to fix it on my own over paying a 100 dollar diagnosis (which I've done 2 times to hear them say "we don't know!") Its not worth it.

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9 Answers

Tiny

fixitmr

April, 14, 2012 AT 3:09 PM

What motor?

Tiny

pos07impala

April, 14, 2012 AT 6:00 PM

3.5 v6 flex

Tiny

fixitmr

April, 14, 2012 AT 6:34 PM

You did the gaskets yourself?

Tiny

pos07impala

April, 14, 2012 AT 7:33 PM

Yea it wasn't too difficult, I had to fix a crossover leak and I went ahead to replace the manifold gasket, just for the sake of been in that far. The car took a couple tries to start then it started up and was making noise, I think it was the lifters but I'm not sure. Right now it just seems like I have some excessive clearances in the valve train. I checked pushrods and only one had some stress marks and it was very slightly bent, could only fit a post it note under it on a level surface

Tiny

fixitmr

April, 14, 2012 AT 7:48 PM
Tiny

pos07impala

April, 14, 2012 AT 9:55 PM

Yep. And do you have any insight?

Tiny

fixitmr

April, 14, 2012 AT 10:14 PM

Not at this time. Will keep in mind and see what pops.

Tiny

pos07impala

April, 14, 2012 AT 11:00 PM

Alright. Basically I was leaning towards a running compression test, a cylinder Leakdown, or get a dial indicator and measure cam lobe lift and compare it to stock height. Sound like I'm on the right track?

Tiny

fixitmr

April, 15, 2012 AT 12:05 AM

Sure, doing anything positive increases the chances of finding the issue.

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