this is a crazy problem. If i start the truck with the maf plugged in it runs bad farts, hiccups,pops back through the maf till it runs for 15 min or so. But If i unplug the maf before it starts then plug it in right away after it starts it will run like a champ . This has had 3 maf's all the same.


one other thing I have been driving around with the scanner hooked up and it will go into closed loop with the maf unplugged WHY?

 

You need to check the power relay's, the MAF burn off relay and if any of those are messed up, as in not working correctly, the MAF life is dramatically shortened, and it goes into closed loop even though its not working, because its still trying to get the best MPG it can.

they are very hard to track these relays down, so just buy all three at hawksthirdgen.org At least you'll get the right ones.

I had trouble in my iroc when one relay failed, I replaced them all. The car will always work better with the MAF attached, working, no lights of course. I am a ASE certifed technician. But I was into fast cars first. Most technicians tell you it won't work or something, when you tell them about anything. Well look at my formula 3.96 60ft used 267hp, the 1/4 was 13.2 @ 105mph, gtech said 254 hp! That rear gear, in a car with a 4.44 would run a second faster than mine. I have stock 3.27 posi, nittos, that day 9bolt posi was acting up, but you have to set it with the parking break if it doesn't engage. That doesn't mean the cones are bad! Also a aluminum driveshaft 300 stall, 700r4 with full shift kit, giant trans cooler, and a lot of suspension in the rear. Well look at the youtube vids

www.youtube.com/cronsformula350

 

today i tried to plug in the maf after it has been running good for a couple days and as soon as i plugged it in it ran like crap i couldn't give it any throttle. even when i unplugged it it never changed. I had to take the battery cable off to clear it and leave it unplugged. it runs ok but it had a high idle.

 

you can pull the ecm fuse for 10 seconds to clear the codes, one of the power relays isn't working, any of the three not providing power or the burnoff section will screw up everything, so check the three relays!

 

I will just change all 3 of them .thanks

 

all 3 changed still wont run with the maf plugged in

 

whats the car year and engine info?

 

87 5.0 firebird thanks we have been just driving it around with it unplugged. But the idle is around 1,000 at times .If you stomp the gas it will drop some times.

 

Any body know more i am having the same problem

 

I am still the same also
thanks

 

bump

 

Ok so i had a new maf turns out it was crap. i got a new from autozone $145 with a life time warranty.

 

I have installed 3 new maf's and still no change HELP

 

does it still run decent without maf?

 

yes just a high idle

 

Have a question? Concerning MAF. My car just started having problems loosing power. or when i start up the oil pressure gage up then straight down and dies. Well today i unpluged the MAF and started right up and drove to the store and home. So what are these three relays you guys are talking about? And is it bad to drive with the Map unpluged?

 

John did you ever figure it out? Any help would be nice

 

no sorry wish i could .I have changed every electronic part on the motor and all 3 relays . and swapped computers also .

 

IAC Maybe?

 

I did replace it but I feel it doesn't move fast enough. I also don't think it moves when i ground the A and B pins on the ADL connector.to set the idle.

 

did you set the idle with timing wire unplugged?

 

no ? I just grounded the a and b terminal to set idle.
I unplugged it when i put the timing light on it .

 

i am purty sure the timing wire needs to be disconnected the turn idle screw down to 400 rpm (305) 450 rpm (350)