Since its basically an air mass metering device, colder air could put it in a slightly different range than warm air

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

What testing procedure should I do? I've found about 6 different ways to test this thing.

Neg on PIN1 and Pos on PIN3 gave me a steady 4.125amps.

Pos on PIN1 and Neg on PIN2 was all over the place with a very obvious dead spot about 10% into air flow meter, could that be my issue? Sometimes at rest it was at 2.XX amps and sometimes 20+ amps.

You need to check voltage on the signal pin, pin2 IIRC. Key on not running slowly depress the plate on the flow meter. Voltage should rise steadily, if you have a dead spot around 10% thats your problem.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

So I went digging in my spare parts bin and came up with a spare. Went ahead and swapped it in and the readings are much more linear and much less erratic. I think I need to adjust it a bit, but I'll do that measurement in the morning and see what I get.

0.3v at close, that should be 0.7v right, so I need some adjustment. That said, voltage rose steadily to around 5v in full open with no dead spots or erratic readings.

On a hot engine, no accessories on, I set it .7-.75 at idle.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

How do you set it at idle? I have to remove the FPR line in order to get to the screws, can I set it with engine off ignition on?

Better to set it with it running as that's when it needs to read correct. Get it loose where it can be adjusted, then reassemble enough to run, lock down the screws that you can, then disassemble enough to finalize. Its a pain, but it gets a proper adjustment.

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Welp, cars doing exactly what it did before but now its every time I touch the brakes. So I think I have my culprit. Decided if I'm going to adjust it correctly I'm going to order the Bosch unit instead of the cheapo chinese one I have.

You have a Chinese airflow sensor?

__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

The spare I had was one of the cheap made in China ones.

Bosch unit came today and got it installed correctly. Adjusted to 7.27v idling, after tightening and rerunning it I was at 7.5v which I know is in spec and I'm leaving it.

That said, the top two bolts wouldnt torque down fully which is a bit concerning. They were fine the last time but at the wrong adjustment. I pressed on the potentiometer when idling after getting them all as tight as I could and the value didnt change so its tight enough I guess.