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Old 10-06-2006, 05:39 AM   #1
mk111boy
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ok ive got a 1987 toyota supra turbo and when i start it it idle's fine but when i go drive it and it warms up the check engine light comes on (its a maf sensor code)and it will rev up and down to 2000 rpm with the gas peddle to the floor . As soon as it hits 2000 rpm in any gear it will do this. ive changed the maf sensor ,wiring harness, ecu ,tps sensor with ones from my other supra, im thinking it may be the egr valve or iac.

PS: it has a greddy blow off valve thats been rerouted to the intake pipe, hardpipe kit, full exhaust, and there is no leaks in the hardpipe kit

PLEASE HELP IM CONFUSED!!!!!!
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Old 10-06-2006, 06:00 AM   #2
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Check your resistance on your MAF. But I dont know if that will help. It has to be something bad in there, because when it starts to open it reads incorrectly causing your MAF code. Try yet another one, And make sure your connections are all hooked up well.
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Old 10-06-2006, 06:09 AM   #3
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^ and you only just mentioned it yesterday but


as in my sig

DO A DIAGNOSTIC FIRST!!
what exact code was it that you got?
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Old 10-06-2006, 06:28 AM   #4
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the code was a 31 isnt that a maf sensor
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Old 10-06-2006, 06:40 AM   #5
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how long ago did you do the diag check?

can you run one now and see what codes you get?

is there any smoke out the exhaust when it's doing this?
did you verify the other afm was good?
maybe try another one
check your grounds also as the afm is grounded through the engine in a roundabout kinda way
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Old 10-06-2006, 07:06 AM   #6
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i just erased the code and did the diagnose again and its a 31 afm code

yes the other afm came off of my supra that runs great

and is the ground your talking about on the lower intake manifold

yes it does blow black smoke wich means the engine is running to rich right
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Old 10-06-2006, 07:27 AM   #7
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hello i have a friend that helps me his url is mk111boy.
i am having problems with my supra 87 turbo
it is kinda hard to explain so here it goes
first when i start it it runs vere good for as long as it is not moving just but when i get in and drive it still runs good but after about 5-10 min running it hard when it reaches its full temp i think this is what is causing what ever it is that it is doing i realy dont know than.it will give me a check light and when i push the gas pedle it will only go to 2000 RPMs and than cut with it pushed all the way down and continue to do this until i let go of the throttle .i have re-routet my greddy blow off back into the intake and changed all the vac lines and all the rubber fittings on all the pipes intake & cooler pipe changed FPR /AFM/knock sensor checked fuel preasure and filter all plugs and wires and changed the AFM 3 times thinking that mabe it was bad ?
i realy need help there is no one but the person that is helping me that can tell me what the hell is wrong withe my car
all the shops that are in this wonderfull state that i live in can not tell me what is wrong with my car so any help that i can get this is my last resort than im calling it quits and giving up it has been down fo 8months and still nothing i do has helped.

Last edited by bigdoggbmx; 10-06-2006 at 07:29 AM.
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Old 10-06-2006, 07:40 AM   #8
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ahhh blowing black smoke....

what was that you said about no leaks

go fix ya boost leaks bud


and don't worry... i know your pain, i've been through the boost tests and told ppl i didn't have leaks and all along i actually did lol
took me 3 goes to find em tho

go thru the tsrm checks too
http://cygnusx1.net/Supra/Library/TS...ion=FI&Page=57
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Old 10-06-2006, 07:45 AM   #9
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all the hoses that are on the boost side of things are all brand new how could this be a boost leak
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Old 10-06-2006, 07:49 AM   #10
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and the black smoke is only when the car gives me code it does not do this when you drive it it will hit stock boost and not hessitate at all the car runs great till it gets hot and than check light comes on and its back to the drawing board for us . i am the one that owns this car and mk111boy is helping me
i know this thing is realy close and it is somthing that has not been looked at so is there any more ideas that you might have please help
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