lexusguy09

My 2000 ls 400 has developed an exhaust leak. It sounds like it could be the manifold gasket. Not that loud but it sounds like air being squeezed out of the gasket. Any ideas on a price to fix?
Also, the engine vibrates when pressing the gas in neutral or while accelerating. I am thinking it is one of the engine mounts. It is not smooth like this engine should be. Any help would be great.

JimsGX

I'd get the exhaust leak fixed first and see if the engine vibration is still there afterwards. The exhaust leak could very well be throwing off the signal to one of the oxygen sensors and causing the engine vibration/rough acceleration.

PureDrifter

iTrader: (10)

are you sure its a manifold gasket and not the infamous EGR leak?

Lexscme

you can try using window weld for the motor mounts itll keep them solid. My friend did that to his car,and no enigine vibration.

Did you check all the exhaust flanges and bolts to see if any are loose??

skperformance

iTrader: (6)

RUn some seafoam throught to find the leaks easily.

JBrady

No EGR on the 98-00 models so that is not it. Not likely the manifold to head gasket. Probably the manifold to cat or cat to downpipe OR some damage. Hard to say on the vib as 98-00s do that (mild) under some conditions.

PureDrifter

iTrader: (10)

wow i should read the thread title

Lexozz

Could be tranny mount. Have that checked as this will cause vibration when worn out.