Question about 2000 Pontiac Grand Prix

2 Answers

3.1L engine ticking noise

Problems started to escalate a few months ago, for the longest time my car had the chronic piston slap that this car has been known to be plagued with. but as with every other car the noise would tend to go away within the first few min. of soft driving. About two to three months ago the ticking became far more obvious at the start and continued to tick whenever the car was running. The very noticeable times when i can hear the tick is while it is in idle and and during the very first parts of acceleration. I have changed oil regularly and done all normal maintenance. Mind you this car only has 49,000 miles on it. Should not be having these sorts of problems yet. Two weeks ago my father and law and I decided to delve farther into the engine and see if the problem could be a bent push rod or anything else that we could see. after we got the valve cover off found that all push rods were in good straight order, mind you we took out one at a time and replace one at a time as to avoid confusion. noticed however that the rocker arms had a side to side movement in them that seemed to cause a slight ticking noise. I guess my first question would be is this a normal thing for the rocker arms to be making this noise, and second what else could this noise be? I am starting to get tired of chasing a phantom noise. Already changed oil with several difference viscosity's had cleaned the egr valve. added lucas to the oil. Would like a solution that doesn't involve going to a mechanic. Please help. Thank you My son bought a gr. prx last fall with only 60,000 miles, had a slight ticking that went away after short drive, now it has gotten worse, I work at a dealership and have been told it is only a piston slap, are we risking having a major problem with this car, should we get out of it now before the engine blows

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  • Samuel Charles Spriggs May 11, 2010

    It really just sounds like a stuck or bad lifter. Have you tried an oil additive for unsticking lifters?

  • yadayada
    yadayada May 11, 2010

    way to long for free forum, try the premium question option if u want an answer.

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Try taking out all spark plugs and turn engine over with starter. If you still hear the tick it could be a loose timing belt or failing tensioner. I had a tick problem that started only when cold but got worse & worse until the timing belt jumped. It was the timing belt tensioner. When the belt is loose, the valve springs snap the valves shut after the camshaft passes the highest point.

Posted on Sep 08, 2014

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If you noticed any wear grooves on the rocker pivots, it could be that the rockers are worn. changer any that show obvious wear. Some movement of a rocker when not under tension is normal but should not be excessive. You can also check to see if any rockers have less travel than others by slowly turning engine by hand and measuring the travel on each (intakes may vary from exhaust, but should not vary from other similar ones) If any move far less than others it can be due to a collapsed or worn lifter, or worn cam lobe. Piston slap is a different issue and usually can be identified only by a good tech with lots of experience.

Posted on May 28, 2009

  • Richard Scordino May 28, 2009

    If you noticed any wear grooves on the rocker pivots, it could be that the rockers are worn. changer any that show obvious wear. Some movement of a rocker when not under tension is normal but should not be excessive. You can also check to see if any rockers have less travel than others by slowly turning engine by hand and measuring the travel on each (intakes may vary from exhaust, but should not vary from other similar ones) If any move far less than others it can be due to a collapsed or worn lifter, or worn cam lobe. Piston slap is a different issue and usually can be identified only by a good tech with lots of experience.

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This a piston slap. GM recognised this problem years ago but instead of repairing 100,000 motors they call it "normal". If it goes away after warm up you should be ok to keep driving it.

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