Hello Everyone My 2004 Blazer has a couple issues i would like toask about. First off at idle it has a clicking sound my dads Suburban also has it but it seems Like alot of vortecs have it when i rev my engine the Ticking gets a bit faster with the idle. Also when im accelerating the engine has a rattle sound like a lifter or a valve. Would u suggest an oil change seafoam??? I know vortecs have Carbon problems.

One last issue from park to drive its fine but when i shift the truck into reverse it has a harsh clunk which shakes the whole truck and can be heard how do i fix that.


Thanks gueys.

 

On the first issue it is most likely the gm piston slap you can read about it and listen to it here http://www.pistonslap.com/, but if it didn't make the noise in the past and now it is then its probably not it. As for the second issue I take it you are shifiting into reverse on level ground when stopped. Is there any rpm jump or anything else that accompanies this clunk noise.

 

There is No RPM jump it does sound like the Piston slap issue so im going to run seafoam today i will keep everyone updated.