MAF gets dirty, reads lower? & my O2 never reads > .

[douglas vincent]

So it used to be that my MAF at idle read .90 average on the multimeter. Now it reads .3 and I am getting a piss poor general run. i.e. it tends to miss.


also, my O2 sensor now never reads above .51. No matter what I do, full boost, full throttle off boost, whatever.


Just venting.


but then again, even though the wagon runs kinda like crap, on boost I get full power and no knock. go figure.

[vrg3]

The lower MAF reading could in part be a result of the misfiring rather than a cause.

Is Torco sensor safe? Maybe it contaminated your oxygen sensor. I really hope you're running richer than 0.51v on a properly functioning oxygen sensor.

[douglas vincent]

Yeah, I don't know. One of those things where you dont know WHAT exactly is doing the fuckup. And therefore it takes ALOT of messing around to figure out what is going on.

I have a few theories which I will attempt to correct in the next few days, if I have time. Yeah, its all about time. And sometimes money.

[douglas vincent]

OH, and my messed up O2 sensor may be whats making everything run right.

Here is my theory.

On boost.........

MAF is crazy high 4.7 -5.0

O2 sensor is only .5

This means lean condition.

ECU may attempt to correct by both pulling times AND dumping more fuel.

Is this a possibility?

[vrg3]

That's possible, I suppose... I don't know.

Couldn't the misfiring at idle be due to the big injectors?

[douglas vincent]

yes, but I didnt have this problem before on the previous engine block.

[douglas vincent]

My O2 sensor could have been damaged by the torco. Its a possibility.

But the MAF has me puzzled. I will be replacing tommorrow.