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Starting up trouble 308QV

Discussion in '308/328' started by Austin Newman, Jun 30, 2020.

  1. Austin Newman

    Austin Newman Karting

    Dec 18, 2019
    160
    Memphis
    Full Name:
    Austin Newman
    When i go to turn the key the starter engages immediately and starts chugging..... however the car takes a bit to fire up... i usually have to reset the key in the ignition once or twice and give it some gas and even then it kinda slowly fires up:

    Has...

    New plugs
    Extenders
    Wires
    Rebuilt distributor
    Rotor
    Rebuilt starter
    New air filter


    Any ideas?


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  3. Crowndog

    Crowndog F1 Veteran
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    Maybe bad start injector? Or it’s not getting a signal.
     
  4. Austin Newman

    Austin Newman Karting

    Dec 18, 2019
    160
    Memphis
    Full Name:
    Austin Newman
    Please advise what that part is? A specific fuel injector?


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  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Does this happen at the first initial cold starting attempt or warm restart attempts or both?
     
  6. Crowndog

    Crowndog F1 Veteran
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    Injector located on right side of plenum with a blue connector.
     
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  8. Crowndog

    Crowndog F1 Veteran
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    You’re in better hands answering Steve!
     
  9. topcarbon

    topcarbon Formula 3

    Nov 3, 2006
    2,071
    Sorry if I sound stupid

    battery condition?
     
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  10. Austin Newman

    Austin Newman Karting

    Dec 18, 2019
    160
    Memphis
    Full Name:
    Austin Newman
    All times. Runs fine and strong.. but the start up is a little rough


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  11. Austin Newman

    Austin Newman Karting

    Dec 18, 2019
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    Austin Newman
    Hmmm could look at that for sure


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  13. topcarbon

    topcarbon Formula 3

    Nov 3, 2006
    2,071
    As I have learned, go for the easiest solution first
     
  14. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #11 Steve Magnusson, Jun 30, 2020
    Last edited: Jun 30, 2020
    Always possible that you have multiple problems (some affecting cold starting and others affecting warm restarting), but I'd start with some easy common things that would affect both -- for example, unplug the safety switch on the airflow meter (simulating and "open" safety switch), turn the key "on" (you should hear the fuel pump run), then turn the key to "start" and try starting to see if it makes any difference in the behavior.
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  15. Sky Patterson

    Sky Patterson Rookie

    Dec 22, 2019
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    Push gas pedal down half way then start it
     
  16. dinoart

    dinoart Formula Junior
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    +1
     
  17. Crowndog

    Crowndog F1 Veteran
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    Any update?
     
  18. conan

    conan Formula Junior

    Nov 13, 2011
    371
    Just curious about how long it usually takes to start without pushing the throttle?
     
  19. Hinecker

    Hinecker Formula Junior

    Mar 14, 2011
    376
    Hello all,
    Not trying to be smart,
    My 328 starts right up, yet needs a fully charged battery and needs to be cranked "fast". A weak battery WILL NOT start the engine.

    John
     
  20. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #17 Steve Magnusson, Jul 2, 2020
    Last edited: Jul 2, 2020
    308i-2V, 308QV, and 328 (except KE3-Jet) have two different modes for running the fuel pump when starting (depending on the deflection, or not, of the airflow metering plate) -- spinning the crankshaft faster helps deflect the airflow metering plate so favors that mode of fuel pump operation over the other (this is also why opening the throttle plate during starting sometimes helps -- it favors deflecting the airflow metering plate so.uses that mode to operate the fuel pump). IMO, you should try the test described in post #11 if you have a slow cranking situation that won't start -- if it helps, you most likely have a relay that needs replacement.
     
  21. Hinecker

    Hinecker Formula Junior

    Mar 14, 2011
    376
    Hello Steve,
    What you say is totally correct. With ignition on, as you depress the metering plate with your finger, you can hear the fuel pump kick on.
    Evidently, if you press the throttle while cranking the engine, more vacuum is created and the metering plate will sink even more. This helps on starting the engine.
    I have the habit of stepping on the throttle when starting the engine( like on a carbureted car). I know it's not needed, but bad habits are hard to get away from.
    On the other hand, doesn't seem to harm anything.

    John.
     
  22. Austin Newman

    Austin Newman Karting

    Dec 18, 2019
    160
    Memphis
    Full Name:
    Austin Newman
    So even if all the other electrical aspects of the car are looking good including the starter the car wont actually fire up?


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  23. Austin Newman

    Austin Newman Karting

    Dec 18, 2019
    160
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    Full Name:
    Austin Newman
    What differences should i see? If I notice something different.. then what?


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  24. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #21 Steve Magnusson, Jul 30, 2020
    Last edited: Jul 30, 2020
    If the car starts more promptly when you force the fuel pump control system to be in the "safety switch open" mode (without using the acc pedal), then you would investigate why the "safety switch closed, but starter motor cranking mode" (without using the acc pedal) isn't working -- easiest thing to do would be to just try using a different ...101 relay in the "G - relay for start injector" position (as it's called in the 1984-85 US version 308QV OM).
     
  25. Austin Newman

    Austin Newman Karting

    Dec 18, 2019
    160
    Memphis
    Full Name:
    Austin Newman
    Any specific part number for that relay?
     
  26. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    The Bosch part number should be stamped into the metal case of the relay (and end in ...101 unless yours has previously been replaced), but you don't need a new one for the test -- just take another one with the same Bosch part number (from say a headlight function position) for the starting test.

    PS Many other manufacturers make an equivalent relay. If you need one, and can't get an exact Bosch replacement, just take the old one to any auto parts store -- they can supply an equivalent relay using the complete Bosch part number.
     
  27. Hinecker

    Hinecker Formula Junior

    Mar 14, 2011
    376
    Afternoon Austin,
    Both TDC & RPM sensors are critical on the startup. No only the sensors, the connectors are just as important( had an issue with that). Another point is to not swap these two connectors, car won't start. I know one is black and the other one is white, but, just by a chance the sensors could have been swapped or replaced.

    Just my opinion.

    John.
     
  28. Austin Newman

    Austin Newman Karting

    Dec 18, 2019
    160
    Memphis
    Full Name:
    Austin Newman
    Where are those located?


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