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Location:
Central Coast, NSW
Registered:
May 2002
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7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 24 May 2005 00:31
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Hi All,
I own a 1990 MZ20 Soarer, powered by a wonderful 7M-GTE engine! (sarcasm!) I recently had the car converted from its standard auto a340 box to a 5 speed w58 box that I scored off a Supra. Gearbox aside as soon as I got it back i started having engine issues, running incredibly rich and stalling constantly - found that this was the hose coming from underneath the turbo to the intercooler had cracked and blown off completely with the extra pressure. This was fixed.
Now my current problem - I haven't heard a peep from the car in 2 weeks or so until randomly it starts jolting around a bit while driving, and will stall if i don't keep the revs up whilst changing down gears. The car displays an error code 31. I know this to be AFM related so I have tried my first AFM, and a spare one that I had from another engine... both exhibit the same results.
The other day I was attempting to fix the car, started it and then shut the bonnet... the car stalled immediately which lead me to beleve there was something loose. I started the car again and shut the bonnet, it stalled once more.
I started the car again with the bonnet open and gave my strut brace a few thumps with my fist and it once again stalled.
I can't seem to find exactly where the problem is, so i've been randomly swapping parts from my spare engine to this one, so far i've only done the AFM and the IASC (idle air speed controller) after cleaning it properly of course
My car is booked into an auto elec but i thought there might be a guru here that could give me some advice as i'm still not even sure if the issue is mechanical or electrical!
Cheers for ANY info you guys can give me, as my car is pretty much undriveable at the moment
A video with quite good sound of the problem can be found here
http://members.iinet.net.au/~danners/7MIssues.wmv
Dan
[Updated on: Tue, 24 May 2005 12:41]
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 7M-GTE Issue - Diagnostic Code 31 (Long Exp... Sorry)
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Tue, 24 May 2005 01:05
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Check the resistance between pins on both AFMs, make sure they are the same.
Clear the codes, start the motor up, then get it to stall again.
Then check the codes, see of the ecu picks up the culprit.
Then carefully check the wires on what it says.
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Location:
Melbourne
Registered:
May 2002
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Re: 7M-GTE Issue - Diagnostic Code 31 (Long Exp... Sorry)
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Tue, 24 May 2005 01:07
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ohhh no avoid bobs generic auto wireing buchery thats typical of most sparkys in the automotive trade.... clean your AFM plug and use common sence and tap around with the head of a screwdriver till you hit gold
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Location:
Central Coast, NSW
Registered:
May 2002
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 24 May 2005 12:47
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Bump! video now added of issue
Dan
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 24 May 2005 12:55
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If you aren't doing that revving then you have an intake leak somewhere.
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Location:
Melbourne
Registered:
May 2002
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 24 May 2005 13:05
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lose the SAFC and see if it still does it... also clean the TPS connecters and look at the MA70 service manual online on how to re-set the TPS
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I Supported Toymods
Location:
melbourne.vic.au
Registered:
May 2002
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Location:
tas
Registered:
June 2002
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 24 May 2005 15:17
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chances of 2 afm's bieng bad are slim, but that video was how my 7m acted when i had the afm unplugged.
unplug your afm and see if it makes a difference, if no difference, then u need another afm.
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 24 May 2005 22:37
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We were doing a little revving... just to try and keep it at a constant amount, but thats impossible with the way its playing up
Thanks for the suggestions guys - i'll see what i can do!
Dan
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 24 May 2005 22:39
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One other thing i forgot to mention lastnight was the fact that I could hear the fuel pump changing frequency when the revs would drop etc... normally its a constant high pitched whistle noise but it was quite erratic when i went to the back of the car to take that video
Dan
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 31 May 2005 00:42
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Update - Electrician has hooked my car up to a laptop and some program called Electra, he reckons the problem is the AFM in the fact that the signal coming into it is alright but the signal coming out is screwed. I took my spare AFM down to him and he's tested that as well and reckons its also stuffed. I find this hard to beleive...
Anyone have a known working AFM that I could borrow to test before I go spending heaps on getting mine fixed?
Alternatively I do have a 1UZ AFM at home with 550cc injectors and a new Walbro pump to go in. If i plugged in this AFM without the injectors just to test it... what would happen?
Dan
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I supported Toymods
Location:
Perth
Registered:
July 2004
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 31 May 2005 00:53
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ahh if only you were on the west coast.. i need someone with a 7MGTE coil pack to do a test with as well.. 
surely your S-AFC would have picked up weird karman frequencies though right if it wasnt working properly?
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 31 May 2005 02:23
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The auto elec has actually removed the S-AFC completely to make sure that its not faulty as well
so it can't be that! 
Dan
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Location:
Central Coast, NSW
Registered:
May 2002
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 07 June 2005 05:27
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Problem solved... two faulty AFM's later a 3rd one went on and the issue ceased to exist
Thanks for the help guys!
Dan
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Location:
Adelaide
Registered:
September 2003
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Re: 7M-GTE Issue - Diagnostic Code 31 (WITH VIDEO OF PROBLEM)
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Tue, 07 June 2005 05:59
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Good to hear that it is finally solved !!!
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