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Thread: Swift Gti Motec M4

  1. #1
    Registered User grape drink's Avatar
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    Swift Gti Motec M4

    Have a MK1 Swift Gti with a turbo kit fitted. Having a problem with it stumbling and generally running shit when engine is warm. Start it in the morning and runs fine until it gets hot and then runs ordinary. It is running a motec M4 and Mallory ignition. I have changed the plugs and gapped them accordingly. Had a spare dizzy and threw that on also. Revs fine out of gear, but once hot and under load, falls over and stumbles.
    Any ideas?
    Last edited by grape drink; 14-04-17 at 08:44 PM.

  2. #2
    Compulsive modifier awdmoke's Avatar
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    Are you still running the factory cold start valve?
    What are the mixtures like?
    Lots of minis & mokes including a G13b powered Sports Sedan, a couple of Swift Gtis, a Goggomobil, 928S, Polo Gti, BMW 540i, a WRX and a Navara with the deadly ZD30

  3. #3
    Registered User grape drink's Avatar
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    No cold start valve. Not sure on mixtures. It is running a bit rich but have no cable to to check via computer.

  4. #4
    What's that whooshing? Aaron's Avatar
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    Coil condition? Could be old enough to be shitting itself when hot giving weak spark etc...
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  5. #5
    Registered User Euronymous's Avatar
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    Pulled plugs to see how they look?
    Possible mech failure like HG
    Possible sensor failure ie cooltant temp
    And the aforementioned electrical, plugs (wrong temp) and coil and leads braking down.

  6. #6
    Registered User grape drink's Avatar
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    Food for thought. Will make a few more checks. Is Ecu wiring to the dizzy/sensors temperamental in relation to heat?

  7. #7
    PF's #1 soft roader advocate Captiva Fan's Avatar
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    How was it get tuned?
    Are you sure it's not just the tune? If it's running a bit rich, it wouldn't seem to have been tuned fully?
    Last edited by Captiva Fan; 16-04-17 at 08:33 AM.
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  8. #8
    Hungry Hungry Hippo Tripper's Avatar
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    Give all the contacts a clean including any earths.
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  9. #9
    Registered User Euronymous's Avatar
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    Can be temperamental, more so if it isn't reading correctly will run like shit and more then likely not throw any codes or alarms

  10. #10
    Registered User grape drink's Avatar
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    Cheers guys. Had another root around and found a faulty wire leading to the dizzy. If i press the wire between 2 fingers the car stalls. I insulated the wire to the point it wont stall again. Took car for a drive but the rough running returned once warm. There is Motec QLd over at Stafford, so might take a trip over there through the week

  11. #11
    Registered User Euronymous's Avatar
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    What was the actual connection like though? Any pics?

  12. #12
    Registered User grape drink's Avatar
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    Here you go. Cheers
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  13. #13
    What's that whooshing? Aaron's Avatar
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    Oh, maybe if you fixed the completely fucked looking wiring the magical electrical fairies will light the spark plugs correctly.

    I get that its temperature related, but it's probably the rest of the thing melting or crumbling or generally fucking up.
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    Chopped BigMuz's Avatar
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    I've tried nothing and I'm all out of ideas
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  15. #15
    Non Compos Mentos Gammaboy's Avatar
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    Is this a purple one with an auto gearbox?
    "Where can we get hold of a Vincent Black Shadow?" "Whats that?" "A fantastic bike," I said. "The new model is something like two thousand cubic inches, developing two hundred brake-horsepower at four thousand revolutions per minute on a magnesium frame with two styrofoam seats and a total curb weight of exactly two hundred pounds."

  16. #16
    Registered User grape drink's Avatar
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    No, this is it
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  17. #17
    Purist, whats that? Jason Broadhurst's Avatar
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    It's likely tune hey, or some of the inputs or outputs to the ECU.

    Start at the tune. From the tune you will be able to rule out a few of the inputs. Rule out the rest of the inputs by testings and inspection. Then move to the outputs and test them in order of likelihood.

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  18. #18
    not a cunt suzuki dave's Avatar
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    From memory the motec uses extremely small cas wires and without proper shielding a ht lead can easily confuse the signal to the ecu when its relatively close to the cas wires .
    Dont suppose you recently had your clutch and gearbox replaced?

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    Registered User I'm DJ!'s Avatar
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    Quote Originally Posted by grape drink View Post
    No, this is it
    That's awesome.
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  20. #20
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    PF response - fit a haltech.

  21. #21
    Registered User grape drink's Avatar
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    Cheers DJ.

    Suzuki Dave- Same car. Do you remember the four puck it had in it? The new clutch is so much better on the street. Night and day.

  22. #22
    not a cunt suzuki dave's Avatar
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    I was subcrontacted on the job by the workshop to help him. It was a huge job the engine and gearbox had to be dropped out the bottom a fair way just to remove the gearbox. Part of the wiring loom had to be disconnected and pushed back to the firewall. the turbo and turbo manifold had to be removed , the radiator , slam panel , intercooler , and quite a lot of other things just to get the gearbox out.

    When it all was assembled back together 10 man hours later it wouldnt start. The next day i bought in my diagnostic equipment and found it had no trigger signal to the ecu from the cas . Traced it back to a dodgy solder connection from the socket to the motec cas wires which are as thick as cat 5 cable. I did a "patch job" to repair the broken joint. The car then started but it was intermittant and was doing my head in. Eventually found that because the HT lead from the coil which was about 2 inches away from the cas wiring was confusing the signal to the ecu.

    The other Dave who you bought the car to said the wiring needs to be repaired correctly from advice from me. There was so much dodgy wiring inside the loom you could not see. The wiring inside the car to the motec was also dodgy.

    I have all the diagnostic equipment if you would like a professional diagnosis and repair. I can even sort out all your dodgy wiring , but it is time consuming and my time is money.

    I drove a swift with a npc 1000lb pressure plate and solid centre brass button puck and it wasnt a problem . I still think you have a TPS calibration , or tune problem which is causing a very poor take off feel. It felt like it had a "flat" spot .
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    Quote Originally Posted by Gammaboy View Post
    Is this a purple one with an auto gearbox?
    Are you talking about the MK3 purple turbo auto car? I used to own it lol.

  24. #24
    not a cunt suzuki dave's Avatar
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    Quote Originally Posted by marshy View Post
    Are you talking about the MK3 purple turbo auto car? I used to own it lol.
    I was wondering if you were the same marshy.

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  25. #25
    Registered User grape drink's Avatar
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    Hi Dave. Yeah the wiring isn't the best by any means. Buying the car interstate and only going by pictures bit me on the arse I guess. When I got the car back from you guys it was running ok. Has just gotten progressively worse since. I agree about taking off in 1st though. I think its more to do with feathering the accelerator. It doesn't like minor inputs. I've organised for Broadhurst to take a look at it. See how we go.

  26. #26
    Non Compos Mentos Gammaboy's Avatar
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    Quote Originally Posted by marshy View Post
    Are you talking about the MK3 purple turbo auto car? I used to own it lol.
    Yes, I was talking about that piece of shit!
    "Where can we get hold of a Vincent Black Shadow?" "Whats that?" "A fantastic bike," I said. "The new model is something like two thousand cubic inches, developing two hundred brake-horsepower at four thousand revolutions per minute on a magnesium frame with two styrofoam seats and a total curb weight of exactly two hundred pounds."

  27. #27
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    Quote Originally Posted by Gammaboy View Post
    Yes, I was talking about that piece of shit!

    Easily the funniest/funnest car ive ever had. That shitbox was pretty reliable and always good for a laugh!

  28. #28
    StinkyWizzleteats GtiMik's Avatar
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    You had an alright time with it back in the day at the drags. It was pretty fucked last time I saw it back when Dave was still at suziauto.

  29. #29
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    I sold it back to some dude in QLD for him and his father to work on, from memory he wasnt all that well. It got repainted just that standard bluey/purple colour, I saw it on ebay a year or two later, and it had either been changed considerably (pics looked same) or the ad was a little suss.

    I went 12.8 or 12.9 with it which was pretty good back then for a FWD on a street tyre.

    i had my fair share of shitty luck with it, but got it there in the end. Wasnt a bad thing for cast piston low comp 1.3 litre - when we rebuilt the motor is was something like 7.2-7.3:1. The day it broke the bearing carrier off the diff was a day ill never forget. Drove fine in a straightish line, but was fucked around corners, problem being that from my house to the workshop back then there was about 50 roundabouts lol.

    How bad was it Dave when you saw it last?

  30. #30
    not a cunt suzuki dave's Avatar
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    Apparently the story goes that the car was stolen , some parts were stripped out of it and was dumped. Ended up at auction where some head wobbler bought it. We ended up with the repair job. The ecu was missing so car didnt run , wiring loom had been cut had to replace both engine bay and under dash wiring loom and ecu. Engine and from memory turbo was fucked rebuilt engine etc to the point where we could drive it , Auto was fucked ! All up i think the bill came to 12 grand or something. Lots more to the story but it was some time ago now.
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