09-14-2012, 01:02 AM
Join Date: Jun 2008
Location: Delhi CA
Total Cats: 0
No power under 4K rpms
I was hoping to get some suggestions as what could be wrong with my Miata.
It has about 202K miles on it. The Wideband O2 is telling me the car is very lean under 4k rpms. After 4k rpms the car behaves normal. The problem is intermittent and I am having problems diagnosing it. I suspect it may be the MAF sensor, but I would like to know for sure before spending the money on a new sensor.
Things I've tried so far:
Cleaned all major grounds.
New battery(it was dying).
Used engine start aerosol spray to check for vacuum leaks, none found.
Replaced leaking catalytic converter gaskets.
Tonight on my drive home from work, the car stalled at a stop sign. Started the car, problem went away. Until I was about 3 miles from my house.
Any help will be greatly appreciated.