rich Z

My car since 1k miles has had pistonslap that would go away after a few mins. The car used no oil. Now just 4 months ago the pistonslap just started to get a lot worse and never completely goes away. Also it's using a lot of oil. 1 qrt in 1000 miles. I tried redine oil and that made it louder. Then I just changed over to non-synthetic Castrol 10w30 and that calmed down the noise alot but not the oil. I find it weird how the car never used any oil and now since the pistonslap worsen it's now using a lot of oil

The car has 41k miles and I have a extended warranty which I might try but GM is such a Aholes they probable won't do anything.

If I do a compression check will that show my anything? Also could it be something else than the pistonslap. I do have a AMW catch can an get 1/4 cup every few weeks.

I posted about this on ls1.com and just no help just humerous remarks.

liftin'em on nittos

iTrader: (2)

i have gone through basically the same story...ended up i had 2 broken pistons #s 5&7, that particular motor never had any spray or boost on it and it killed 2 pistons. i think it had something to do with a lean condition. piston slap, then more accompanied with burning oil...then BYEBYE

rich Z

The car runs strong and haven't noticed anything else wrong. I'm not running lean. Had the car autptapped a few weeks ago and a yr ago on a dyno. I do ping though but thats because of the 91 octane fuel here in Ca.

Brett95z

iTrader: (-1)

My advice would be to take everything aftermarket off the car, and take it to gm see what they say. I know they will laugh at you with mods.

Xtreme57

iTrader: (6)

ha, well yeah - my car had the SAME EXACT issue. no problems at first then EXACTLY 2 qts of oil every 3k like clock work. I thought 'whatever, stupid *** gm won't do anything anyway'. the next step was my car throwing a misfire code for the #7 cylinder in 6th gear (engine up the most load) - so i came home and changed the plugs/wires/coil pack for #7 NO GOOD. So i finally broke down and brought it to a dealer - they did a leak down and compression test. turns out #7 had half the compression of the others.

((((((((((((((((((FAST FOWARD 1 YEAR))))))))))))))))))))))))

Turns out my #7 rings were shot and b/c of the regularly low oil condition it burned up a couple valves too. So i'm basically getting a new motor - new pistons/rings (i upgraded to forged pieces and added a cam and a bunch of other stuff just b/c i wanted to have something to show for it) - but the point is if you have the warranty USE IT.

Xtreme57

iTrader: (6)

btw - gas pedal slack mod??

rich Z

I'm gonna try that maybe next week. Only thing I'm worried about it my warranty says I have to have the car serviced for oil changes at a dealer every 6 months or 6k miles and I have been changing the oil myself for the past yr.