Every so often knock

[SeanMc]

It doesn't happen all the time. Usually it's only audible when I am idling, but it's not constant, nor will it happen all the time. It's usually after the motor is warm, but then again, like I said before, it doesn't happen all the time. After I rev the motor a bit, you can hear kind of a rolling knock, not a dunk dunk dunk dunk like a rod knock, but a dunkdunkdunk (gets louder in the middle, then fade out) dunkdunkdunk and then stops. The only time I get an oil light is under hard braking when the trans doesn't have a chance to downshift, but then the motor comes right back up to idling speed after a second or 2 of a super dim oil light, and the trans gets a chance to downshift. I don't have time to pinpoint the noise, since it goes away before I have a chance to get the stethoscope. I'm not having any drivability issues, and car has plenty of power. Bearings are just short of 30k miles. When I do hear it, it sounds like it's coming from the drivers side of the motor.

 

[SHOtimer]

What were the condition of the timing chains, and timing chain tensioners when your motor was rebuilt?

Doug

 

[SuperHO]

Yeah...what he said. More'n likely the noise you're hearing sounds like rod knock in double time...which, if is the case, rip the valve covers off and change them bitches!!!

 

[SeanMc]

I have no clue. I guess I'll have to look.

 

[SHO#7]

What were the condition of the timing chains, and timing chain tensioners when your motor was rebuilt?

Doug

I agree that this is where you need to look first.

Good luck

Mike

 

[93rev2sev]

Whack the cats with a mallet. It might be punch out time.

Edit...I saw from your sig that you have a custom y with high flow cats. Don't rule out the cats just because they are newer. There might still be a chunk broken off of one of them and its vibrating.

 

[jbeano]

Another vote for cam chains tensioner.

 

[SeanMc]

Whack the cats with a mallet. It might be punch out time.

Edit...I saw from your sig that you have a custom y with high flow cats. Don't rule out the cats just because they are newer. There might still be a chunk broken off of one of them and its vibrating.

It's a top end noise. Sounds like it's coming from under the t-body area.

 

[Ishodu]

Check your crank bolt, and pray its not loose.

 

[SeanMc]

It's not. It's the transmission. I'll be taking it in Monday for warranty service. When it warms up, the CEL comes on, and the thing slips like **** and feels like the car has no power. Yay.