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Hit a Huge Puddle - Running Rich 700

posted by  88 740 Wagon on  Tue Dec 14 01:18 CST 2010
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last visit: Wed Dec 15 01:00 CST 2010
[RELATED]

Hi,

I have an 88 740 GLE Wagon. It was pouring rain Sunday night and I hit a huge puddle at about 40 mph. The car sputtered and completely died. Spark is good but I found that the injectors are pouring the fuel in. When I pull the #1 fuse the car will start and run until, I can only assume, the fuel runs out. The minute I plug in the #1 fuse it dies again. It started this morning (30 degrees), with fuse #1 plugged in, and it ran extremely rich and died....
So the injectors are probably getting a constant current. I need to verify but it's definitely running extremely rich which is killing the engine.
Anyone ever have this problem before?

Thanks in advance.








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    Hit a Huge Puddle - Running Rich 700

    posted by  Will740turbo on  Tue Dec 21 08:42 CST 2010
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    last visit: Wed Oct 22 16:09 CST 2014
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    It's good advice to check the fuel pressure regulator. It's easy to check for a blown diaphragm. It could be a coincidence with the water splashing something.
    Remove the vacuum line and check to see if it leaks fuel. If it does, that's your problem. There is another test involving the return fuel line to the gas tank.

    Also, there was another poster who had exposed O2 sensor wiring. Shorting that out will feed the ECU 0V, which is extremely lean. The lean condition will make the car overcompensate by dumping fuel into the engine.

    Also, the temp sensor (or its wiring) can be bad, causing the engine to pour fuel into the engine.

    Given that there is seepage even with the injectors disconnected, I would check the fuel pressure regulator.

    Good luck

    --
    1990 740 Turbo, on its way to stock specs, maybe beyond








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    Hit a Huge Puddle - Running Rich 700

    posted by  someone claiming to be fixit2002 on  Wed Dec 15 03:51 CST 2010 [RELATED]

    Check the fuel pressure regulator vacuum line to see if it's dumping gas into the intake manifold.








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    Hit a Huge Puddle - Running Rich 700

    posted by  someone claiming to be fixit2002 on  Tue Dec 14 02:36 CST 2010 [RELATED]

    So...seems like something got wet. Maybe a cable connector plug? If you could keep it running the engine heat may eventually dry things out but you may need to get a hair dryer and just start drying cable connections. Also check the grounds on the inner front fenders. Take the air filter out and see if it's not soaked.








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      Hit a Huge Puddle - Running Rich 700

      posted by  aleekat on  Tue Dec 14 05:18 CST 2010
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      last visit: Fri Oct 24 13:19 CST 2014
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      Ditto. Maybe check the radio suppression relay under engine hood. It sends signals to the injectors to open/close.
      --
      Post Back. That's whats makes this forum work.








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      Hit a Huge Puddle - Running Rich 700

      posted by  88 740 Wagon on  Tue Dec 14 05:17 CST 2010
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      last visit: Wed Dec 15 01:00 CST 2010
      [RELATED]

      Thanks for the response!

      I'm trying to check the signal to the injectors. I'm seeing the 12 volts coming in but I don't see the drop in resistance on the ECM side. Can someone tell me the best way to check to the ECM signal. I'm currently using a Fluke meter.
      Another weird thing, fuel is leaking out of the joint between the exhaust manifold and the front exhaust pipe even with the injectors unplugged. Fuel is obviously leaking past the injectors and into the cylinders. Is this due to mormal fuel pressure during crank or do I have a pressure/ injector issue? The car will actually kick and almost start with the injectors unplugged.

      Thanks again for any help provided.








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        Hit a Huge Puddle - Running Rich 700

        posted by  aleekat on  Tue Dec 14 05:27 CST 2010
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        last visit: Fri Oct 24 13:19 CST 2014
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        Guess I would pull your passenger side kick panel and look at the computer. Is it wet? You might be able to salvage it by letting it dry out on its own. No hair dryer, etc. If you can get a hand full of the "silicon packing" that comes with most electronics. Put it in a box and let it sit. This is not a one day event to dry it out. It may be damaged beyond repair. (this is worst case stuff, hopefully not) Check your oil, it may be full of fuel.
        --
        Post Back. That's whats makes this forum work.








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          Hit a Huge Puddle - Running Rich 700

          posted by  88 740 Wagon on  Tue Dec 14 07:03 CST 2010
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          last visit: Wed Dec 15 01:00 CST 2010
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          Holy crap.. It started and is running. I had a space heater drying out the rug and maybe (just maybe) I dried the computer. I'm screwed if the car dies again. I need to understand the fuel system better.

          Thanks for the help. If anyone can tell me what fuel system my car has that would great....








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          Hit a Huge Puddle - Running Rich 700

          posted by  88 740 Wagon on  Tue Dec 14 06:46 CST 2010
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          last visit: Wed Dec 15 01:00 CST 2010
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          Here's a stupid question. How do I know what fuel system my car has? It's an 88 740 GLE Wagon, 5 sp. It has an in-tank and main fuel pump. I've been assuming that it's the LH-Jetronic 2.4, B230F.
          Thanks!








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            Hit a Huge Puddle - Running Rich 700

            posted by  N7SC on  Tue Dec 14 07:16 CST 2010
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            last visit: Sun Jul 7 14:12 CST 2013
            [RELATED]

            With 2 fuel pumps it probably is Bosch, but to be sure check the ignition coils. The Bosch ignition, used on the Bosch fuel injection cars, has a normal, cylindrical, coil with three leads on the top of it. The leads are the normal big plug cable to the distributor, and the two little leads that supply voltage and etc. In my Bosch car the coil is on the passenger side, near the back of the engine compartment.

            The Rex/Regina cars have a big, rectangular, cubic, sort of thing for a coil, and it has heat fins on it. It is on the driver's side, on the front of the driver's side strut tower.

            All that said, I have no idea what fuel and ignition systems the GLE cars, like yours have. They are 16 valve variants on the B230F, and may well have the same systems, but I don't know for sure.
            --
            1955 Human, Scott; 1991 745 Turbo, Brunhilde; 1990 745GL, Snuggle Bunny








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              Hit a Huge Puddle - Running Rich 700

              posted by  88 740 Wagon on  Tue Dec 14 07:24 CST 2010
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              last visit: Wed Dec 15 01:00 CST 2010
              [RELATED]

              Thanks!! I have the same system with a traditional looking coil up behind the strut tower...








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                Hit a Huge Puddle - Running Rich 700

                posted by  88 740 Wagon on  Tue Dec 14 07:27 CST 2010
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                last visit: Wed Dec 15 01:00 CST 2010
                [RELATED]

                Sorry for all the posts. The car died again. This time with a huge cloud of grey smoking pouring out of the tailpipe. I noticed fuel seeping from the head gasket too. The coolant doesn't look any lower. Does anyone have a match?








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          Hit a Huge Puddle - Running Rich 700

          posted by  88 740 Wagon on  Tue Dec 14 06:27 CST 2010
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Wed Dec 15 01:00 CST 2010
          [RELATED]

          Thanks.. Good advice. I don't feel any moisture but I suspect the computer did get wet. There is a hole in the floor in the center of the passenger's side and rug is wet but I'm really hoping it didn't fry the computer.

          I don't know what I'm supposed to see on the injector connector. I know one lead should show a constant voltage and I'm assuming the other lead will show a drop in resistance to ground to complete the circuit. I was measuring the voltage on both of the connector pins and I was seeing 12 volts on both with the ignition on. Does one pin drop from 12 to 0 while the other stays at 12 to create the pulse???







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