The manifold and sensor were both replaced late in '02 (around Nov. IIRC).
In the last month or so, I've reset the P0420 code maybe 5 or 6 times. It wasn't until last week that I pulled the P1151. Just 2 days ago it started stalling under hard decelleration. The RPM's just PLUMMET.
I've had the K&N on for a little over a year. The first time I had these problems (prior to the manifold/sensor replacement) I was running the stock intake.
What makes this more aggravating is that my mechanic claims that those codes "don't even exist" for this car. WTF!?
I'm planning on checking/cleaning or replacing the following:
MAF, IAC valve, EGR valve, idle air bypass, Air filter.
MAYBE replacing the O2 sensor.
Hopefully some combination of the above will clear up the low idle/stalling problem.
I suppose I'll have to bite the bullet and get some MSDS headers to replace the plugged pre-cats (MUCH cheaper than stock manifold!)
- unless, of course, I can find some good, cheap, pre-gutted manifolds- no more pre-cats to clog and no more sensor to foul.
Given the above, could my car really be running lean- per the P1151 code? Or is it still "pending"?
TIA,
-Chuck
