Rod knock?!!!??!

zeke1985 · Jun 1, 2015

2005 Chevy Malibu Maxx LT v6. 100380 miles. I just had the dealership change my plugs and wires and changed the oil on Saturday. The car would sometimes knock like piston slap, and then yesterday I noticed it sounded a little different, today I popped the hood and here is the video....Thanks a lot guys!

View My Video

01rangerxl · Jun 1, 2015

That sounds more like maybe an exhaust leak to me. I would check EGR plumbing and the exhaust manifolds.

VetteElite · Jun 1, 2015

Nice engine BTW. My Aura has almost the same engine (GM High Value V6) but I think the 2005 model year did not yet have the VVT that the later year ones did. Long live the pushrod!

OneEyeJack · Jun 1, 2015

Not a sharp enough noise to be a rod knock. Look around for something else.

Cujet · Jun 1, 2015

I don't think that's an exhaust leak.

Does it go away when you apply a little throttle and come back when you "lift" ?

spasm3 · Jun 1, 2015

I'd do as 01rangerxl suggested. check for exhaust leaks. Also check to make sure the accessory devices such as ps pump alternator , ac compressor have tight bolts.

I just bought a saturn that had a sound that could have been mistaken for rod knock, it was the belt tensioner.
Check it with a flashlight and see if its really moving a lot at idle, and if the sound seems to be coming from there.

zach1900 · Jun 1, 2015

.High value v6? Lol

abycat · Jun 1, 2015

Originally Posted By: zach1900
.High value v6? Lol

actually high feature is what it is

4wheeldog · Jun 1, 2015

That could be a loose spark plug. Which is possible, given that they were just changed. If it is, it will get a lot louder, very soon, when the plug exits the head.

VetteElite · Jun 2, 2015

Originally Posted By: abycat
Originally Posted By: zach1900
.High value v6? Lol

actually high feature is what it is

High feature is DOHC. High value is pushrod. http://en.m.wikipedia.org/wiki/GM_High_Value_engine

The_Eric · Jun 2, 2015

Too fast and too dull for any combustion related event- so not rod knock, not valve train, not piston slap. All this is assuming the engine was at low idle. Bearing noises like "rod knock" get worse with engine temp.

Could be belt driven or electrical- like evap purge solenoid (yes, I've heard a few that were that loud). Try removing the serpentine belt and see if the noise goes away.

zeke1985 · Jun 2, 2015

01rangerxl was right they broke an vacuum peice the other day so it's getting replace ced for free.

Rod knock?!!!??!

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