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Thread: MA70 woes...where to start?

  1. #1
    Cressyskidder Grease Monkey Bowlsclubboy's Avatar
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    Default MA70 woes...where to start?

    Hey guys...got a problem with my gfs MA70 GT limited auto 7mgte supra.

    She was coming over to my place on friday night, about a 45min drive and her car wouldn't start. It turns over and everything but no bang bang.
    She gets a ride to my place with a friend on saturday morning and not long after gets a call from her mum saying that her car started easily.

    I put it down to just being an arsehole car as usual.

    She drives it to work this morning and i just got a phone call saying that it wont start again for her to get home.

    Her tow truck driver friend is either towing it to a mechanics (noone in albury knows supras/imports btw) or home for me to play around with it. I can only come up with a few possibilities. One being leaking capacitors in the ECU and temperature fluctuations allowing the car to start sometimes? or possibly the fuel pump or AFM but this doesnt explain the intermittent nature of the problem.

    Any ideas, please help!

    Cheers,

    Troy
    1992 MX83 Cressida Grande-1JZ-GTE...Actively Dori.

  2. #2
    Balloon Slayer Backyard Mechanic jimmmayyy's Avatar
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    Default Re: MA70 woes...where to start?

    Check the connector on the cam angle sensor. The wires come loose and the ECU gets no signal for firing. Also the ignitor can develop a bad earth.. so check that and/or run another earth to it. It's a pretty common prob i've found.

  3. #3
    drunken escapades Conversion King fatboy13's Avatar
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    Default Re: MA70 woes...where to start?

    check for ecu codes?
    Quote Originally Posted by MR 1JZ
    watching a bunch of supraforums members try to debate something technical is like watching a bunch of retards try to fuck a doorknob...

  4. #4
    "it went up in a jiffy" Conversion King Kedderz's Avatar
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    Default Re: MA70 woes...where to start?

    neutral start switch on the tranny. get one that works and she'll be apples!

    Common problem.
    RA23 - Twincharged
    JZZ20 - Daily

  5. #5
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    Default Re: MA70 woes...where to start?

    Quote Originally Posted by fatboy13
    check for ecu codes?
    that would be the best thing to start with

  6. #6
    Beer Fueled Domestic Engineer doobs's Avatar
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    Default Re: MA70 woes...where to start?

    Quote Originally Posted by Kedderz
    neutral start switch on the tranny. get one that works and she'll be apples!

    Common problem.
    Checking this and the ECU for codes would be a good start

  7. #7
    Balloon Slayer Backyard Mechanic jimmmayyy's Avatar
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    Default Re: MA70 woes...where to start?

    If it was the neutral start relay it wouldn't crank at all. Check if you have spark, i'd bet money on it being the cam angle sensor wires. I had exactly the same prob.

  8. #8
    Is a Chief Engine Builder wilbo666's Avatar
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    Default Re: MA70 woes...where to start?

    A few notes / things that I'd start looking at...

    >jimmmayyy is 100% right if it is the neutral start switch at the gbox the car won't crank!

    >the ecu should throw a code if the starter is cranked for more than 15seconds without starting the engine (Bridge TE->E1 in the engine diag box to check/pull the codes).

    >It could be the COR relay not working and the fuel pump not turning on, or the fuel pump resistor, or a number of other things

    Cheers
    Wilbo

  9. #9
    Beer Fueled Domestic Engineer doobs's Avatar
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    Default Re: MA70 woes...where to start?

    [QUOTE=jimmmayyy]If it was the neutral start relay it wouldn't crank at all. Check if you have sparkQUOTE]

    Very true

  10. #10
    Cressyskidder Grease Monkey Bowlsclubboy's Avatar
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    Default Re: MA70 woes...where to start?

    Thanks for the replies guys, i called them yesterday to say check the CAS and ignitor connections as its a common prob. The guy said "we'll check fuel first first" I dont wanna sound like im trying to do their job and call them again to say pull the codes, heres how lol.
    My bet is that if they find the pump not turning on for whatever reason, they'll try and replace it. Why cant mechanics use the interweb too?
    Cheers,
    Troy
    1992 MX83 Cressida Grande-1JZ-GTE...Actively Dori.

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