som1sc

iTrader: (4)

Hey guys, have any of you had the p0103 code? I cleaned my old one and even bought a new mass air with no luck. Do you have to tune it out or is their another way to get rid of it? I have dart heads, MS4, vic jr intake w/elbow, NW 90mm, and red top injectors. Thanks in advance.

LS1-450

iTrader: (33)

Increase C2901. It's probably happening 'cuz you're operating above the limit of the MAF frequency.

jimmyblue

iTrader: (11)

If it's -voltage- high, this may be a harness open
fault. If it's -frequency- high, like P0103 for my
year, that's a hella lot of air flow (reading over 13500
Hz).

If you have a DMM that reads frequency you might
check it out that way, also scan for the MAF freq
reading real-time. Should see 2000-3000Hz at idle
and it takes a pretty strong motor (FI) to get over
11000Hz at WOT.

EMI in the harness could possibly cause a high freq
reading at occasions where stuff like the coils or
injector drivers make a "magic" frequency falling in
range. Check this by scanning, looking for "sports"
in the MAF frequency that might go over the top;
verify by pulling the MAF signal wire out of the
harness bundle to get rid of any coupling.

LS1-450

iTrader: (33)

I'm @ 11,250 HZ @ 5200 RPM (NA). Was thinking that if he has a cam that goes along w/ the listed mods, then surpassing the MAf frequency is possible (NA) P0103.

Frost

iTrader: (45)

No way, not with a stock MAF and your mods.

-edit-

see the 85mm in your sig.

LS1-450

iTrader: (33)

When did I ever say stock MAF? Som1 never indicated stock or other, either. All I said is that it is possible.

som1sc

iTrader: (4)

I had a stock mass air and changed to slp 85mm, reset the ses light and the code came back. Its an 01 camaro with the MS4 cam.

LS1-450

iTrader: (33)

OK, that's usually the case for a P0103 on a moded car. Increase C2901 to something like 15000 (not an exact, just something reasonble above 12000).

Also, make sure that you have re-tuned the MAF table & then check your VE & PE settings (if not already done).


Appologies, if I sounded rude while replying to jimmyblue & Frost. As it was not my intention to be rude.
Both gentlemen have assisted me in the past & know their $hit. I just figured we were talking about an 85mm MAF & replied accordingly.

Frost

iTrader: (45)

I honestly didn't think I'd see an 85mm MAF with an FI setup. It maxes out ridiculously early and leaves you with weather and environmentally dependent fueling. Between that factor and the MS4, the car would run much better in 2bar SD...

sorry,
/end 2-cents

som1sc

iTrader: (4)

I'm NA

Frost

iTrader: (45)

Well with SC in your screen name..... uh.... anyway. yeah.

I would expect that you will still max that MAF out pretty easily. Why not run SD with such a serious N/A setup?

jimmyblue

iTrader: (11)

At any rate, you still really want to know whether
the overrange is real or spurious or a plain fault /
malfunction. If it's only "sporting out" then a limit
fix will make the code go away but leave you with
a transient misfueling. If it's consistently that far
out in frequency then you're over the top of MAF
table index.

som1sc

iTrader: (4)

Well I unplugged my mass air today and nothing changed. A p0135 code also showed up which is the oxygen sensor. Looked at the plugs and they all look great. The motor bounces around like its trying to jump out from under the hood at idle but has good throttle response. Also, I find this odd, when I start the car in the mornings or even when the engine has had time to cool down, on startup this thing whistles like a huge procharger then eventually gets quite. I know this is when the idle valve is open but its almost ear peircing loud? Is that normal? Oh yeah, 1SC is an option code for a stripper model, like 1LE or Z28. Sorry for the confusion