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1989 740 Turbo wagon, will not restart Hot 700 1989

posted by  radhaz on  Sun Jul 29 14:45 CST 2007
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OK, I need brains to pick, I have tried to establish where all of the fuel is coming from when the eng is shut down. I've even considered a bizarre route through the Charcoal canister.

O2 sensor seems fine, and responds to all "Simulated" rich or lean conditions, monitoring the sensor output using an analog voltmeter on a 1 volt scale.

I have a 1989 740 Turbo Wagon, T+, M46 Trans, Mitsubishi Turbo, IPD VX Cam.

Car will start on the first rotation, idles rich, then smooths out. Runs great....don't shut it off though, it will not re-start. Let it sit a few hours, and it will fire up immediately again. Temperature does not have to come up for this to happen. Tonight I fired it up, ran it for about 1 minute, Temp gauge had not moved off the rest....shut it down, will not restart.

Spark is still there, so I figure not Hall sensor. It seems to be dumping fuel into the cylinders, spark plugs wet when removed in this dead condition. Fuel pressure regulator is brand new bosch. Temp sensor good, fuel pump relay good, radio suppression relay jumped out, no difference. Injection system is Bosch LH 2.2 . My next step will be to get a fuel pressure gauge in the line and see what I have on the rail...but I don't see how that would explain the wet plug "Flooded" condition.

I may be looking for a used, yet alive ECU. Anybody have any experience or thoughts on this ?

Only thing nagging at me....I have not re-shimmed valves since the Cam went in...it was an engine out, freshen all seals, new head gasket, new cam affair, with a bunch of cleaning.

I really HATE the idea of bringing this to the local Volvo dealer...but it may come to that. I have a Summit Fuel pressure gauge coming that I am going to put on the rail this week to see what happens when she goes "Key on", then starts, then what happens when shut down. Any thoughts on what would hold the injectors open , dumping all the fuel in the rail into the manifold ? Brand new Fuel Pressure regulator....any other way fuel could be dumping to the intake system ?


Again, any help GREATLY appreciated !

Dave Hamm
__________________
__________________
Dave Hamm
Hampton, Va.

1989 740 GL wagon, auto, NT
1991 740 Sedan, auto, NT
1989 740 Intercooled Turbo Wagon, Man Trans, T+, Loaded !








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    1989 740 Turbo wagon, will not restart Hot 700 1989

    posted by  Steve on  Mon Jul 30 11:21 CST 2007
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    last visit: Fri Oct 24 07:16 CST 2014
    [RELATED]

    Check the ECU coolant temp sensor: if it fails, it can cause a very rich mixture. That may explain the no-hot-restart: flooded cylinders. And the fuel line check valve note makes sense too.








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    1989 740 Turbo wagon, will not restart Hot 700 1989

    posted by  greg_mustang on  Mon Jul 30 04:26 CST 2007
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    last visit: Sat May 10 07:26 CST 2014
    [RELATED]

    Had the exact problem wit hmy 89 b230f 240.

    At the end the problem was the check valve in the fuel line at the fuel filter/pump under the car.

    It was leaking backwards, and when hot, some type of vapor lock situation was occuring.

    15$ valve, couple hours of mess to change. New filter while at it.
    Fixed the problem 100%, that was almost 5 years ago.

    In essence I had *difficult startups when hot. I had to crank it for VERY LONG like sometimes a minute to get the fuel up. At the end I just shorted the fuel relay instead of cranking to save the starter...

    Check it out.

    Thanks,
    Greg Mustang
    Montreal - Canada
    www.volvoclassic.bravehost.com

    --
    Greg Mustang - www.volvoclassic.bravehost.com







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