Quote:
Originally Posted by DrRobin
4 x Bosch O2 sensors fitted, the post cat on bank 2 wouldn’t thread in, so I had to take the cat out and fit it on the bench, still done now.
ECU reset and then started, ran okay, but not really much different to before, a slight uneven exhaust note. The short term fuel trims went straight down to -8% and I noticed the MAF read 6.5% at 800 rpm when warm. I suspect my MAF is over reading, as the engine was running rich.
The bolts holding the MAF in place won’t come out, my security Torx bit won’t go in correctly, I am not sure if it because the bolts are rusty or the Torx is the wrong size. I was using a security T20 with six stars. I think it might be a 5 stars?
I didn’t manage to get it out, so fitted the new air filter and disconnected the MAF, the fuel trim was much closer to 0% and the engine ran much better. A short journey proved it, running much better and fuel trims close to 0%.
I will try to get the MAF out tomorrow, then try a clean, but probably need a new MAF.
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When you disconnect the MAF the system defaults to open loop. There is no fuel correction (trim) happening while in open loop operation. That is why your fuel trims show close to 0%. Fuel trims mean nothing in open loop operation.
What is your MAF voltage with key on engine off??
What is your MAF voltage with engine running at idle?????
Have you disconnected your battery or had a low or dead battery in the recent past????
You say you reset the ECU... what did you do to accomplish that??? What do you mean by you reset the ECU???