mista0406

iTrader: (22)

Car is a 99 with a 00vi swap with 96 JWT ECU S/C Upgrade

The car is giving me the same two codes p0100 MAF-VAF. I do have a slight throttle body leak since I swapped to the pathfinder TB.

I've swapped between my four MAF and with no result I keep getting the same problem. The main issue with the car is it wont rev past 2500 RPM under load or at idle. ALso Ive gone as far as swapping the ECU and MAF back to the original and the same problem and codes arise.

Ive contacted JWT many times with little results . My current SC setup is complete (to a degree considering this issue). I've had to swap the plugs once due to more fuel then I wanted.

At this point Im at loss as to what my main problem with the MAF is. Ive swapped the wires many times from the standard three plug to the four plug setup. I've also moved my ground wires on the four plug setup and added more thinking the ground is bad.

Setup is as follows
V1 setup W/2.87 pulley and 3'' charge pipe
550 injectors
pathfinder TB
walbro 255 FP
Bosch bypass valve
JWT 96 ECU SC tuned
300 ZX MAF x3 -yes I have a few to many and they all do the same thing

OC_Nooby

iTrader: (11)

Measure the voltage on the MAF connector. See what you get between the pins. Check to see if the manual gives you a reading from said pins or I can measure on mine.

Fix the damn vacuum leak...its causing your engine to have un-metered air get in.

Lastly, and probably the main problem but you wired the MAF wrong. Take a picture for us. No reason for 3 MAF's to be bad.

mista0406

iTrader: (22)

The reading that i'm getting from the MAF is under 1v from the signal wire with the key turned to the on position, then with car turned over and revving i'm reading around 3v from the signal wire. I'm also getting 12v from the power wire. What the hell is happening?!?!?

I know I know the vacuum leak is being fixed as I type.

I wired the wires from the Z32 MAF as described on the JWT website and from here on the forums. The last thing I did different is ground one of the MAF grounds to the body of the car.

This is getting so aggravating, it came out of nowhere and now i'm stumped.

The Wizard

iTrader: (43)

Just to confirm, you've swapped out the JWT ECU AND the Z32 MAF and gone back to OEM parts at the same time?

If so, then I'd say your wiring is bad.

You say this "came out of nowhere"....so your car was boosting and getting past 2500rpms? Have you tinkered with anything lately?

mista0406

iTrader: (22)

Yes, I had the JWT ECU and Z32 MAF on, and to eliminate them as the problem I swapped back to my original ECU and A32 MAF, and i'm still getting this issue like the car's in limp mode. I also took the charge pipes off and ran the Z32 and A32 MAF's with no boost and same issue.

I was considering that it may be a wiring issue, but from here, I don't know where to start looking or testing. Any help would be appreciated on this this subject.

Yes, car was boosting just fine with no issue, I haven't done anything to the car "wiring" wise.

BronxSleeperMax187

I remember A few years ago having the same issue and the mechanic told me it was watered down gas in my tank....couple of bottles of gas tank water remover,octane booster and gas from A different station..... power was back.

OC_Nooby

iTrader: (11)

First off don't ground the ground wire to the body...I don't know but maybe its going back to the ecu and it compares the voltage readings. Your car is in limp mode for a reason and 3 z32 mafs don't lie.

Connect the wires correctly, I know it seems logical that a ground is a ground but do you know where the ground actually goes from the maf connector?

Should be a quick fix