damaged maf?

[smug510]

hey a little help would be greatly appreciated, i had my turbo sohc running good for about a week than it sat for a week and i tried to start it up and it had a misfire , so i cleaned the plugs but still a misfire , and runs like s*!t , so i checked all of the spark and its fine but when i pul the plugs they are soaked i gas so im wondering if my maf took a dump , ohh ya and another thing when i let off the gas it shoots flames out of my downpipe , i do have a 95 maf with same three wires coming off of it so would i be able to run that? , any input on this would be nice , thx

[Josh]

Just hope it isnt the MAF, or that the '95 would work... I checkedt out and the retail on it is like $500 and some odd dollars, and we sell it for like $400 and something... But yeah, expensive... Thats for a '93 with a DOHC so maybe its a little more, I was just curious as to what mine was. But yeah, I wouldnt think it would run at all if the MAF didn't work.

[C-Kwik]

Under what circumstances does it misfire? At idle? Describe your set-up.

The 95 MAF will not work by just plugging it in. The ECU would need to be reprogrammed for it.

[daniel240]

What!! are you saying the MAFS is $400-$500?? thats crazy, i just bought a used one for $50 shipped so i can hack it for my kat project.

[smug510]

it misfires from idle all the way up . feels like it is running way to rich, but here is my setup, toyota ct-26 turbo, isuzu npr intercooler , blitz bov, apexi afc , stock injectors, command flow fpr, msd fuel pump, sci msd w/blaster coil, will i be able to run that 95 maf with my afc?

[daniel240]

what plugs do you have a what are they gapped at? ive heard that 6heat range gapped at .30 is what you need.

[Josh]

Yeah man, new prices are ****ed up... call your local NAPA or Advance (if you want it to break) and check... I couldn't beleive it...

[C-Kwik]

Is the command flow FPR boost dependent(not 1:1 ride in pressure for rise in manifold pressure)? If you are using a FPR that is just adjustable in base pressure and you've increased pressure to handle the fuel requirements of boost at higher RPM's, then it will run rich at lower RPM's including idle.

Check your settings on your AFC as well. You might be able to use a high Fuel pressure setting but you will need to bring down the injector duty cysles at low RPMs and off boost. I'm not sure your version of the AFC will have enough resolution to do this well.

As far as plugs, I doubt the plugs are the issue. If you are finding fuel on the plugs, it sounds like it is running way rich. The gap should not be an issue except under boost. Since your problems are occuring at idle as well, I can't imagine the plugs are a problem. As far as the plug temperature range, it won't be critical to use a colder one unless you are boosting a lot or often. It shouldn't cause the problems you are having.

Suggestion: work on the fuel problem. Make sure the right amount of fuel is being delivered. Try setting all the values for the AFC to zero and the FPR to stock pressure. See if it idles ok. Drive it a bit to see how it runs. Don't boost while doing this. Just drive enough to isolate if running a stock fuel system cures the problem. If it does, you'll need to retune your fuel enrichment settings for boosting to work better.

Describe your fuel pressure and AFC settings and that might help us get you a step close to figuring it out as well.

[smug510]

my fpr is a base regulator it is set at 40 psi with stock inj. and my afc is set at zero, my problem lies in that i had it running very good with the afc set at zero all across exept for around 4500+ i had the afc bumped up a little , but ran good and idled good so im lost , i am pretty shure its my maf but i just wanted a second opinion, and i wanted to know if my 95 maf would work if i just change the settings on the afc, but thx for you repies