Noise during acceleration-99 prizm

[stearnski]

When I accelerate it sounds like I have an exhaust leak coming from the engine...but only when I accelerate. My pipes look OK and if I rev the engine out of gear it sounds fine. I think the intake manifold is OK since I have no coolant loss....Any thoughts.

I also have codes P0446 and P0441.

Thanks for the help.

[johnholl]

Got the same condition. The noise goes away once the engine warms, but snow or rain will cause it to come back. I heard its caused by a crack that developes in the exhaust manifold, or manifold gasket. Good luck with the evap codes....all 99's develope them. It's either the pressure sensor or the canister

[johnholl]

p.s. also make shure the exhaust system heat shields are tight

[stearnski]

Update: I got the car checked out and they said the sound is caused by a leak between uppipe and exhaust manifold and can be fixed with a new donut gasket/bolts/springs. The engine torque causes that joint to flex causing the sound. estimate=$100-150.

[johnholl]

Originally Posted by stearnski

Update: I got the car checked out and they said the sound is caused by a leak between uppipe and exhaust manifold and can be fixed with a new donut gasket/bolts/springs. The engine torque causes that joint to flex causing the sound. estimate=$100-150.

Seems kinda steep for gasket replacment. Have you tried a muffler shop?

[n1ckml007]

I have a 1999 Prizm, I just needed a bolt for mine $9? Then 1hr labor $75 to replace it on the front exaust gasket flange.

[n1ckml007]

I have this issue again, I found a nice thread about it here: http://www.corolland.com/forums/inde...howtopic=17057

I just managed to change my serpentine belt in my 1999 Prizm, so maybe I'll take a crack at the donut / gasket.

[n1ckml007]

Um yeah, so I jacked up the car I realized that I had ordered the gasket parts for the down/up pipe to catback.

But the issue is likely the connection from the manifold to the up/down pipe. Which has the spring loaded bolts, and is fairly hard to get to (unless I imagine the car is on a lift. I think I'll leave this to the pros.