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Hello everyone,
I have a heavily modified 9kt...
88 with the LH 2.2 of course,
jak stoll fuel chip, modded apc box, 3.0bar FPR, 34# red top injectors, t3/t4 hybrid turbo, full turbo back exhaust...
I think that's all you need to know for this post..
I've had really bad luck with air mass meters, two of them going bad unexpectedly in less than a few months.
One of them would just stall the car out all of a sudden, and the other one burned it's filament out only a few months later.
Both of these would run the car perfectly... for the most part... as far as air/fuel mixture is concerned.
I have a zeitronix wideband A/F system in the car on a digital gauge which i trust, and even if it wasn't spot on with it's measurements...
...I know that currently it is running almost FULL RICH under any throttle at all, where as before, with the other AMM's it was running around 12-13:1
I tried many other used AMM's and was disappointed with the results, some of them going full rich under load around 10 and even 9 sometimes, and others WAY lean, 15-16 and even 18 once...
These are the 005 AMMs with the adjustment screw. I would start around 380 ohms and then go wherever it would idle the smoothest...
no, i do not have an oscilliscope to check the o2 sensor reading, for a perfect swing... and, it had never been done before, and the car wasn't running so rich before...
I tested one of my amms that went bad, it was set to 190ohms... so... i tried setting all the used ones to 190 but none of them performed well under any setting, low 100 or high up into 400's
Since these amm's were used, I figured that it was pointless, because I could never know for sure what the deal was with any of them.
I got a remanufactured one today, which came set at 550 from the factory, started with 380, and the car went full rich at IDLE, which was worse than anything before, which idle at 12-11
i adjusted to screw until the a/f gauge went to about 12 stable... car is warmed up, sensors warm, again i trust this gauge, car sounded idling fine...
checked the ohms... 25.00 ohms...
that's pretty extreme....
and under NORMAL driving, not even beating on it, the car STILL goes full rich.
I sucked on the FPR vacuum hose, and it hold vacuum, not leaking diaphragm...
I have the option of using a simulated narrow band output from the zeitronix box, which i hooked up in place of the stock narrowband o2 sensor, and connected it to see if the car ran closer to normal, it made no change.
it seemed like it was going WOT on the fuel side as soon as throttle was applied...
so i unplugged the TPS sensor completely, and there is ZERO change in the behavior of the car..
i mean ZERO, idle is normal, still go rich under any throttle to the point of a little bucking, slogging down
soooooo
anyone have any ideas?
I'm almost thinking of putting a stock fuel chip back in, and seeing if i can even GET the a/f ratios to be slightly normal
what did them plugs say before all this crap with the AMMs?
the plugs looked a little teeny tiny bit burnt when the gauge was reading 12's under WOT...
they are the recommended ngk but 6 heat index not 7, not sure if that was why, but basically they weren't black...
i didn't look now yet, but they MUST be black.. even my tailpipe is blackened now, the thing reeks of gas...
help...
-gavin
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