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91 740 Turbo with Intermittent stall at speed and idle. 700 1991

posted by  dobiesan on  Mon Mar 31 22:07 CST 2008
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last visit: Sat May 3 21:38 CST 2014
[RELATED]

Hi All

Frustration plus!

Quits at all speeds and it's fuel, I believe, as the tach stay's alive.
Have swopped from a goer....pump relay. rs relay, the two ecu's, crank sensor,knock sensor, amm, main fuel pump and filter tray and heard the in tank pump, checked for fuel in the fpr vac hose.
It seems to be an electrical problem that cuts the fuel. The check engine light comes on, I pull #1 fuse and replace as I coast along, seemr to reset and away we go again till the next time. The only code I get is on 6 and is 1-4-4.
I don't know about the ignition switch, coil or distributer though I feel that I need to check some earth(ground)/wiring connections to do with the ecu and ground locations inside the car, but I will really need some advice for that.
I do have a Haines diagram to 89 if that's appropriate.

Any help will be very appreciated.

Cheers
Ian








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    91 740 Turbo with Intermittent stall at speed and idle. 700 1991

    posted by  dobiesan on  Wed May 7 21:34 CST 2008
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    last visit: Sat May 3 21:38 CST 2014
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    It was the fuel circuit in the fuel injection ECU. Swopped with a known good ECU from another car, fixed and the problem swopped to the other car.
    I thought I had already swopped it(as per a previous post). I eventually found it under the right kick panel....duh!








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    91 740 Turbo with Intermittent stall at speed and idle. 700 1991

    posted by  dobiesan on  Tue Apr 1 19:47 CST 2008
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    last visit: Sat May 3 21:38 CST 2014
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    After finding and swopping the power stage and going for a drive.... no change, same code on 6, 1 4 4.
    I do find when it dies at higher revs that if I take my foot off after a few seconds it will re-ignite on it's own and with foot back on, off we go again.

    Thanks for the thought Herb.








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    91 740 Turbo with Intermittent stall at speed and idle. 700 1991

    posted by  Herb Goltz on  Tue Apr 1 12:19 CST 2008
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    last visit: Fri Oct 24 13:23 CST 2014
    [RELATED]

    I don't see the power stage on your list of swapped parts-- they do fail intermittently, particularly when the car is warm.

    Good luck!








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    91 740 Turbo with Intermittent stall at speed and idle. 700 1991

    posted by  dobiesan on  Tue Apr 1 12:15 CST 2008
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    last visit: Sat May 3 21:38 CST 2014
    [RELATED]

    This morning (New Zealand) I drove with the cover off the FI relay and before quiting I heard the contacts break and make again prior to a restart. I assume then that ecu is getting a stop message or power is being lost somehow.







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