1fast5.0

ok i have a 87 lx that has been converted to maf the problem that iam having is that when you run the car with maf disconnected it runs fine as soon as i plug in the maf it starts running like sh** and stalls i have a supercharger on the car could it be that because the supercharger belt is off the car isnt getting enough air the maf is calibrated for 24lb injectors and thats what i have and ideas what the problem could be.

1fast5.0

anyone??

AdderMk2

is the MAP sensor still connected to vac referance?

maybe the MAF is bad.. se if you can swap in a known good maf and see what it does

1fast5.0

i took the map sensor of a 89 it has no vac lines to it.and i know that the maf works i took it of a running car

jasonvri

What ecu are you using?
Is the MAF cal'd for this ecu?

Disconnecting the MAF will tell you absolutely nothing.

You need to start by pulling the diagnostic codes, and see what you get from that.

24's are likely too small for a decent amount of boost...


jason

navmust

Same problem with my 93 cobra.. Had a supercharger and it ran fine, I decided to take the superchrager off. It had a "big Air" Maf 6 wire maf.. I spliced the stock harnes for a 4 wire maf.. And I also took an extra chip that was added to the computer off..

It has the exact same problem as yours.. Idles fine without maf, as soon as i plug it in, the car starts to die...

I had it diagnosed, it came up with code 66, and 94..

66 = low maf voltage pin c

94 = Sumtin about hardline malfunction....

5.0stanger

nevermind...I thought it was ford info in general...sorry

navmust

I read what you are saying.. I tried different mafs that worked in other cars??? Im confused, dont know what to do..

settled4automatic

does pin C receive voltage? or is it the signal to the computer?? if that supplies voltage to the MAF, then see why you don't have voltage there. is the MAF is supposed to put out voltage there, and its low, then check your connection at that harness --- look for bent/collapsed terminals, corrosion, etc. and if all the other wires have the appropriate voltages/grounds -- then it sounds like a MAF sensor.

navmust

Thanks man, I will check the connections real good.. The maf does get the ground, main voltage "12v", and like you said, the next reading which I think is pin c gets all kinda weird readings.. I'l try to check my connections asap and i'l see what happens...

I know its supposed to get .6v at idle and 2 volts at about 60mph...