1999 Subaru Legacy Repair Question
Mileage: 134,500 miles.
99 Subaru Legacy will not idle with Mass Air sensor and exhaust heats up, without the sensor idles but does not get over 3k rpm
Asked by FeldonKaneAnswer
you need a back pressure test on the cat. either that or the timing belt is bad causing retarded timing.
roy
But how would that work with it getting full RPM range with the Mass Air Sensor plugged in?
what is full rpm in your thinking??
I would start with the basics here and after that move on to other possibilities.
Roy
With the sensor plugged in it will get up to around 7 to 8k depending on how close to the red line i want to push it. Sorry my Mechanic friend and I have spent close to 40 hours trying to figure this out
ok, did you do a back pressure test?? did you check the timing belt???
as far as the mass air flow, i would look at all the basics before heading in that direction.
roy
Ill be honest with you, i do not know. We may have but if we did it was a while ago as far as the back pressure test goes. I do not think we checked the timing belt though.