89tang

iTrader: (15)

Well i've been floating around these forums for awhile an just this weekend i picked up a 1999 T/A auto with about 88k on it. On the test drive the car seemed great but i noticed it seemed to have what sounded like an exhaust leak i figured no biggie since it has a magnaflow exhaust on it with clamps holding it together just figured it was coming from that. All i can see it has is an SLP lid an the magnaflow catback everything else looks stock.

Well we brought the car home this weekend and i looked further into the exhaust leak sound, but come to find it out it's not coming from the exhaust at all i found no leaks. The sound seems to be coming from somewhere on the drivers side of the engine compartment. It doesn't make the sound when it's idling just when you rev. it past about 2000rpm it'll start making the noise. And it's pretty noticable if your paying attention. It doesn't seem to hurt the performance or nothing of the car. It sounds like a mix between an exhaust leak an a tapping sound. The car will be going back to the dealer if its something that can be fixed but after doing some research it's probably something i'll have to live with. I'll see if i can get a vid. of it that might help trying to see what it is. I sprayed some carb cleaner around thought maybe it was a vaccum leak but that lead me no where.

Anyone got any ideas??

89tang

iTrader: (15)

Here's a small Video of the noise maybe it's normal sounding i don't know like i said i never owned or even been around LS1's i'm a 5.0 and a L67 guy .


http://www.ezarchive.com:80/ezarchiv...y7HcTt6rt4epcp

right click save as it'll download quicker

BrandonSS

iTrader: (1)

Vacuum leak? Mine sounds just like that and it was where the EGR bolts to the upper plenum. I was missing the o ring gasket. Not sure man... hard to tell from the vid.

89tang

iTrader: (15)

Where is the egr up front isn't it? it sounds like its coming from the back of the motor. I didn't figure vaccum leak cause the car runs fine at idle an everything.

98Grnz28

iTrader: (7)

Sounds like the Egr tubes. Hard to tell.

89tang

iTrader: (15)

Is that just the sound the tubes make or is there a leak? Cause i sure can't find a damn leak haha

98Grnz28

iTrader: (7)

Sounds like the EGR tubes making the noise. I took all of my egr stuff off.

89tang

iTrader: (15)

That would create a code wouldn't it taking the tubes off.

kilmor

reminds me of my spun rod bearing, it started out not too bad, only at high RPM's too. Prolly not what you have but just something to think about.

89tang

iTrader: (15)

Rod bearing would cause oil pressure to be crappy would it not. Pressure is 40 at idle an climbs accordingly to rpm.

98Grnz28

iTrader: (7)

Your oil pressure sounds fine. If it stays at 40 and climbs when you rev it.
Yes, taking the tubes off will cause a check engine light. Try removing your egr and cleaning the egr valve with throttle body cleaner.

89tang

iTrader: (15)

Yeah i was just saying if something major like a rod bearing or something it would cause the oil pressure to be crappy or do weird things. Anyways i don't think it's the egr making the noise so cleaning it would make no difference. The sound is coming from the back of the driverside of the motor.

98Grnz28

iTrader: (7)

Well, I just listened to your car again on my desktop and it sounds like a bent pushrods. I would just about put money on it.

89tang

iTrader: (15)

Even though it's an auto??

98Grnz28

iTrader: (7)

yea if you bought making that noise. Someone could have liked the sounds off the rev limter. They ARE some kids around here where I live that love to hear the rev LIMTER in a Ls1. I have replaced three different cars pushrods because they bent them.

89tang

iTrader: (15)

Cool i'll have to take it back then an tell them to look at the pushrods. Yeah we bought it how it sits right now with the noise an everything. I was thinking pushrods but it sounded more like an exhaust leak cause it went away but maybe it doesn't it just can't be heard over the motor when it's rev'ed past a certain point. Thanks i'll tell them to check that out.

This noise is probably why it was traded in sitting at a honda dealership, and probably why it was cheaper then others i seen at other dealships.

98Grnz28

iTrader: (7)

It is easy fix it probably take no more than 2 hours including a break. And, some new pushrods.

Predator

My car sounded like that before I did the cam change. Since then the sounds have disappeared. I always thought it was from either pushrods or a header leak. I did install new pushrods (with the cam change), and a couple bolts on my driver's side header were a good 3/4 of a turn loose.

1fstbird

iTrader: (19)

i agree i had the same problem and did the same thing changed the cam and pushrods sound went away

89tang

iTrader: (15)

Just an update, i took the car back to the dealership last thursday. Got there an the tech. guy took it for a drive an came back an was like "well you wanna take a ride with me an show me what it's doing i don't heard nothing" . I said no just pop the hood an i'll show you. Anyways the owner of the dealership was out there too and they all heard the "noise". The owner said no i have no problem fixing it an sent it off to a place that does most of their work. Which leads me to believe they knew the car was making the noise. They had to have thought it was an exhaust leak too cause the back two header bolts were shiny like they had a wrench on them someone tried to tighten them but the others were rusty. That and they had no arguements of fixing it i figured they would said i done it or something an try to get out of fixing it.

But it's not done as of yet hopefully pick it up today or tomorrow, the guy that sold the car to me didn't really have any answer's as to what was wrong but he said he heard them on the phone say something about a rocker arm but i'll get the full scoop on it when i pick it up.