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mk111boy · 10-06-2006, 04:39 AM

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!!!!!!

Isphius · 10-06-2006, 05:00 AM

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.

suprra_girl · 10-06-2006, 05:09 AM

^ and you only just mentioned it yesterday but

as in my sig

DO A DIAGNOSTIC FIRST!!

what exact code was it that you got?

mk111boy · 10-06-2006, 05:28 AM

the code was a 31 isnt that a maf sensor

suprra_girl · 10-06-2006, 05:40 AM

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

mk111boy · 10-06-2006, 06:06 AM

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

suprra_girl · 10-06-2006, 06:40 AM

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

bigdoggbmx · 10-06-2006, 06:45 AM

all the hoses that are on the boost side of things are all brand new how could this be a boost leak

bigdoggbmx · 10-06-2006, 06:49 AM

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

suprra_girl · 10-06-2006, 06:53 AM

a) brand new doesn't matter, you may have put a clamp on crooked

but since this is only when it's hot (by which i assume you mean up to temperature not overheating)

check the tsrm with a voltmeter and go thru the checks for your air flow meter

it is more than likely a worn/broken/shorting wire in your engine harness not in the afm itself if it does it with a good afm also

10-06-2006, 04:39 AM	#1
mk111boy Stock Join Date: Oct 2006 Location: utah Posts: 4	problems problems problems 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!!!!!!

10-06-2006, 05:00 AM	#2
Isphius 500whp yet? Join Date: Nov 2005 Location: Long branch, NJ Posts: 1,006	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. __________________ Yay the supra assistant is gone!!! WEEE!!

10-06-2006, 05:09 AM	#3
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	^ and you only just mentioned it yesterday but as in my sig DO A DIAGNOSTIC FIRST!! what exact code was it that you got? __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

10-06-2006, 05:40 AM	#5
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	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 __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!

10-06-2006, 06:40 AM	#7
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	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 __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first! Last edited by suprra_girl; 10-06-2006 at 06:44 AM.

10-06-2006, 05:28 AM	#4
mk111boy Stock Join Date: Oct 2006 Location: utah Posts: 4	the code was a 31 isnt that a maf sensor

10-06-2006, 06:06 AM	#6
mk111boy Stock Join Date: Oct 2006 Location: utah Posts: 4	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

10-06-2006, 06:45 AM	#8
bigdoggbmx Intake Join Date: Oct 2006 Location: utah Posts: 35	supra girl all the hoses that are on the boost side of things are all brand new how could this be a boost leak

10-06-2006, 06:49 AM	#9
bigdoggbmx Intake Join Date: Oct 2006 Location: utah Posts: 35	2nd 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

10-06-2006, 06:53 AM	#10
suprra_girl 7M POWAH! ;) Join Date: Jun 2004 Location: New Zealand Posts: 2,312	a) brand new doesn't matter, you may have put a clamp on crooked but since this is only when it's hot (by which i assume you mean up to temperature not overheating) check the tsrm with a voltmeter and go thru the checks for your air flow meter it is more than likely a worn/broken/shorting wire in your engine harness not in the afm itself if it does it with a good afm also __________________ Please use the forum to ask your questions as they will get replied to much faster than pming me Pics of my build. "Good girls are just bad girls that don't get caught" Do a diagnostic first!