1991 Buick LeSabre
3.8L V6 Engine
Initially started hearing excessive noise from engine bay only at mid-high RPM (don't have a tach, sorry). Noise sounds like an engine would at high RPM, but with a higher pitch - maybe like a small exhaust leak.
I found a small exhaust leak from the EGR valve gasket, but had to keep drving the car until i received the new gasket. While driving under more strenuous conditions i noticed a signifact loss in power especially at higher RPM. When I got to my destination I found that the EGR had broken (perhaps from the excessive heat produced by the gasket leak). So I replaced the EGR valve, and re-wired all of the corrosponding wiring (it had melted & fused together). Since then, I've done a tune-up as well.
So everything is functional again, but I'm still experiencing this increased pitch in engine noise, and acceleration loss at higher RPM.
Is it possible that while my EGR valve as damaged, which was for a duration of maybe 60 miles, my catalytic converter was damaged? Or any other ideas?
Loss of acceleration, the backpressure noise and such are kinda tell tale signs of that converter having problems, feel the exhaust out of the tailpipe it will be warm normally have someone step on the gas and if its super hot it'd be a step in the right direction.
567 views
Usually answered in minutes!
×