Quote:
Originally Posted by morgal48
Got these codes in May along with the MAF code (?) - don't remember cause it has not come back. 1126 and 1133 have returned. Cleaned the TB and the MAF. Engine starts, hits around 1500 rpm and dies. Over and over. Installed two new Bosch post cat O2 sensors. Same thing. Installed the old MAF that i replaced, and the car runs rough, but runs. No misfires. Unplug the MAF and it idles at about a steady 800 rpm cold. MAF is a Bremi from PP. Not certain what info from my MD808 is accurate without the MAF installed. Suggestions please.
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First thing.
Using a MAF sensors other than Bosch in these cars doesn't seem to work well.
Also make sure you get the proper replacement part number.
From your post I see this is a 2000S
Same thing I have in Guards Red.
When you unplug the MAF sensor the ECU reverts to a fixed fueling map.
The cold start or open loop map I believe. So the car should run sort of ok with the MAF sensor unplugged if all other things are ok.
So simplest things first.
Make sure your battery is in good shape. sounds silly I know.
A marginal battery can cause problems in these cars.
Make sure your plugs and coil packs are in good shape.
Marginal plugs or cracked coil packs can cause miss fires.
Make sure you don't have any exhaust leaks.
Exhaust leaks ahead of pre or post Cat O2 sensors cause false O2 sensor readings.
Make sure you don't have any vacuum leaks.
Vacuum leaks occur after the MAF sensor so that is unmetered air so vacuum leaks screw things up
I reread your post and see that you did a smoke test.
You may want to do a fuel pressure test at the fuel rail. Fairly simple to do.
Stalling can be a sign of low fuel pressure.
Couple of questions:
Is the car drivable with the MAF unplugged or does it still stall out?
Why did you replace the post Cat O2 Sensors?
Let us know how you go.