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LH-Jetronic Question

posted by  BDAY55 on  Thu May 27 03:26 CST 2004
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MY 89 740GL takes a little longer to start. I believe its a leak down at the injectors. Any good diagnostic test I can perform to troubleshoot?


In the last week I replaced:
-FPR
-Starter
-plugs/cap/rotor
-oil/filter
-main fuel pump/filter
-rpm sensor


Thanks,
-Bob







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    LH-Jetronic Question

    uid 55's pic
    posted by  john sargent on  Thu May 27 05:06 CST 2004
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    last visit: Wed Oct 22 09:07 CST 2014
    [RELATED]

    Did you re-use the check valve at the fuel pump? If so, it might be leaking and causing the pro-longed start.
    --
    john








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      LH-Jetronic Question

      posted by  BDAY55 on  Thu May 27 06:03 CST 2004
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      Actually I purchased an aftermarket pump (Master ) that included the check valve and had the same results. I tested the Bosch one I replaced and it ran fine (I know I should have tested it first) anyway I put the Bosch back in with the original check valve. Maybe I should just buy a new one ($12.00) but why didn't the other one work? I'm gonna get a guage and test the pressure. Maybe there is a restriction in the line and pressure is alittle low.








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    LH-Jetronic Question

    posted by  Rule 308 on  Thu May 27 04:21 CST 2004
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    last visit: Tue May 8 09:20 CST 2012
    [RELATED]

    Well the injectors and rail pop right out of that thing, you could always pull the rail complete and physically see if they are leaking down. You could simply connect a fuel pressure guage and watch for leak down.








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      LH-Jetronic Question

      posted by  BDAY55 on  Thu May 27 04:52 CST 2004
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      Yeah I'm buying a guage at Pep boys on the way home. Once the car starts, it runs great. I replaced the FPR when I noticed high pressure fuel coming out of the open spark plug port (i was testing for a spark) also the vacuum end of the FPR had fuel in it, so I assumed a ruptured diaphram.








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        LH-Jetronic Question

        posted by  Rule 308 on  Thu May 27 08:10 CST 2004
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        last visit: Tue May 8 09:20 CST 2012
        [RELATED]

        Testing for spark with fuel coming out of the open spark plug hole, hmmmm sounds like a recipe for a wiener roast for sure.








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          LH-Jetronic Question

          posted by  BDAY55 on  Thu May 27 09:10 CST 2004
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          HAHAHA - Spraying out, dude, like a garden hose. No the Lord was by my side that night. The FPR was bad so when I replaced it I didn't seat it properly so when I started the engine gas was spraying all over the place. Well the ignition wires and dist caught fire, luckily I had my trusty garden hose in hand and put it out. Just the wires and cap had to be replaced, I was lucky (and stupid).

          I have a million other stupid things I've done with cars.







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