rp0029

iTrader: (1)

Car is a 68 camaro lq4 hybrid with ls3 top end and a cam. It was running well after being tuned by dan maslic, but I think I'm having a maf issue. Car falls flat on its face at WOT. Hooked up my elm scanner + torque android app to it and Maf reads about 150-180 cfm at idle and spikes to 500-800 cfm with slight blips of the throttle. Today I made a data log and the reading shows the car spikes to soup to about 2500 cfm at wot! Car is throwing p101 and rich on both banks for fault codes. Is this a faulty maf or a bad circuit? How do I test the maf with a multi meter?

jimmyblue

iTrader: (11)

For starters, I've never seen mass airflow reported as volume. That
is kooky in itself. I guess ELM allows you to convert mass into volume
flow units by some fudging, but it's not useful and likely inaccurate.

It's very unlikely that the MAF can put out the frequency needed to
represent 2500CFM, and pretty certain that the PCM would clip
the number to 511g/sec and 14kHz.

I have one multimeter that reads frequency. Without that ability you
can only determine that the piece has its power, ground and output
pullup supply (+5V); MAF output should be slightly less than the +5V
PCM pullup raw voltage that you can find on (say) TPS feed, if it it
switching right. That's about all you can determine.

I'd check the ENG SEN fuse first off, if that's blown you will see a
whole raft of sensor faults.

MontecarloDrag

iTrader: (3)

You can unplug the MAF and test it. It will go into SD and use VE tables for fueling. Most people don't tune VE tables higher than 4000 RPM but it should be safe to do one test WOT run.

A proper datalog using HPtuners or Efilive can tell you if the MAF is failing or not.