75K miles only. Seems to be running lean. This is a recent phenomenon. The
stalling is only occasional, but happens only at very low speeds, following
deceleration. Car also pings under acceleration, on the freeway. I drive
it gingerly to avoid the pinging. Pinging abates at night, for some reason.
There is no overheating. Can anyone advise?
Before this stalling business, I was getting "P0401" code "insufficient EGR
flow." Before I fixed that, but a couple months after P0401 started to
show, I started to see the stalling. After I replaced the EGR flow sensor,
which fixed the P0401 error, the stalling has gotten worse. And, to boot,
NOW I am getting P0402 errors. Seems to be an inappropriate error code.
The P0401 was associated with noticeable sputtering upon acceleration at low
speeds. This was conspicuous lean fuel-air mixture. A P0401 implies a
mixture too rich, not too lean. As such, I still believe the error should
have been "P0402," "excessive EGR flow," because THAT is INDEED what was
happening. I used a vacuum gauge to observe the command signal to the EGR
valve, before and after replacement of flow sensor. Replacing that flow
sensor SOLVED that sputtering problem, immediately. I had previously taken
the EGR valve out and found it to be OK.
So now the stalling is worse. I am about to put some serious
instrumentation on the car, but thought I'd petition here for anyone who has
experienced this problem.