Mechanics

SATURN L300 ENGINE PROBLEM

2003 Saturn L300

Engine revs far past 5k under heavy load and will not shift until slight letoff on gas pedal no codes new maf sensor, new transmission, had fuel tested and is good no misfires good fuel pressure and volume what have I missed?
Avatar
Brettcarter
November 7, 2012.



I would do a back pressure test sounds like a plugged cat let me know what you find.

Saturntech9
Nov 7, 2012.
Both cats have less than 1 psi back pressure 5k rpm

Tiny
Brettcarter
Nov 7, 2012.
So the test was done at both exhaust manifolds attached to the heads?

Saturntech9
Nov 12, 2012.