Maf Q?

[jesse0880]

how much do the MAF units cost. im having poor acceleration prolems with my 91 turbo and got to the MAF sensor the when checked, it was out of specs. ( the connection that is tested for resistance when the door is open and closed was super low)... normal when closed i think is 200-600 ohms, but when i tested it closed it was about 150 kila ohms.

[tHa kNiGHt FaLL]

I think they are like 300.00...

Disconnect the harness. On the air flow meter. There should be 7 pins, From LEFT to RIGHT

Pins 5 and 6 are E2 and VS...

Resistance from VS to E2 is 200 - 600 Ohms at fully closed
20 - 1200 Ohms at fully open

If it doesn't meet these specs it need to be replaced... but test it multiple times before you condem it. Make sure you have good connection on you test leads

[jesse0880]

i was told that MAF sensors can be cleaned. but this came from a mech that mostly just works on ford stuff... is this also true with my deuce MAF sensor?

[tHa kNiGHt FaLL]

Originally Posted by jesse0880

i was told that MAF sensors can be cleaned. but this came from a mech that mostly just works on ford stuff... is this also true with my deuce MAF sensor?

yes... there is three kinds of MAF in all cars.

all others are self cleaning, the Vane Type which the MR2 has you have to clean yourself.

be careful what you use to clean it. You don't want to damage the Intake Air Temp Sensor which is in the MAF housing.

you can remove the potentiometer covering on the backside and check the resistance strip. see if it has a glazed or worn type of hot spot.

[jesse0880]

be careful huh?... i think i might have F'ed it up already then cause when i rebuilt the motor (and didn't know much about restoring cars), i cleaned out my MAF sensor with engine degreaser (the purple bottle) and water. i just sprayed it in the unit and rinsed it out. just about how bad was my decision to do that?

[tHa kNiGHt FaLL]

Originally Posted by jesse0880

be careful huh?... i think i might have F'ed it up already then cause when i rebuilt the motor (and didn't know much about restoring cars), i cleaned out my MAF sensor with engine degreaser (the purple bottle) and water. i just sprayed it in the unit and rinsed it out. just about how bad was my decision to do that?

degreaser...?

prolly didn't harm anything... i meant corrosive shit like brake cleaner

[jesse0880]

awsome. thanks man.

[jesse0880]

oh by the way... have take off the underneath part right? where there are about 13 screws?

[jesse0880]

what parts are the most important to be cleaned? im gonna clean everything, i just dont wanna miss the good stuff. thanks

[tHa kNiGHt FaLL]

Originally Posted by jesse0880

what parts are the most important to be cleaned? im gonna clean everything, i just dont wanna miss the good stuff. thanks

inspect the carbon strip on the potentiometer.

but thoroughly clean the door... the hinge it swings on. make sure no guck is stuck in the corners

[jesse0880]

i dont see any carbon strip my friend. is the door suppose to slide off or something?

[jesse0880]

k... i cleaned everything and now everything reads to specs. but i was wondering, when i test the two leads during the opening of the door, the reading drops into K ohms while the door in between positions. is that normal?

[keck03]

Originally Posted by tHa kNiGHt FaLL

yes... there is three kinds of MAF in all cars.

all others are self cleaning, the Vane Type which the MR2 has you have to clean yourself.

be careful what you use to clean it. You don't want to damage the Intake Air Temp Sensor which is in the MAF housing.

i was going to do this myself this coming up wknd. what type of cleaner would you recommend? i think mine is done but i want to check it first before spending the big bucks on a replacement.

[jesse0880]

i used degreaser and it worked great. all the crap came off real easy with a rag and Q-tip.

[keck03]

Originally Posted by jesse0880

i used degreaser and it worked great. all the crap came off real easy with a rag and Q-tip.

thanks i'll give it a try.