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328 stalls at traffic light

Discussion in '308/328' started by jimveres, Jun 16, 2008.

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  1. jimveres

    jimveres Karting

    Oct 31, 2003
    68
    #1 jimveres, Jun 16, 2008
    In the Bosch CIS thread Shark49 wrote the following. I'm starting a new thread because my '89 328 just started doing the same thing. Here's what Shark49 wrote:

    Is this whats causing my car to stall? I did a search but don't know what the hell the thing is called!

    My mondial has been wanting to stall lately when I come to a stop. The rpms will drop down way low and it will cut out if I dont give it a little gas. I remember that turning the knob to open up the valve for the air coming from the air box helps this so I did and my rpms are up but I want to know how to properly set the rpms and this valve so its running correctly. Can somebody help?



    My '89 328 has recently started doing exactly the same thing. As I approach a light I push in the clutch. The rpms drop down quickly and, sometimes, the car stalls. Other times the rpms drop way down then recover back to a normal idle just below 1000 RPM.

    There must be a mechanism in the Bosch injection system that prevents the RPMs from crashing down so far that the car stalls. What part do I need to investigate or replace?

    Thanks for the help,
    Jim V.
    '89 328 in Seattle
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,901
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Jun 16, 2008
    US version or Euro?
     
  3. jimveres

    jimveres Karting

    Oct 31, 2003
    68
    #3 jimveres, Jun 16, 2008
    U.S.
     
  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,901
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #4 Steve Magnusson, Jun 16, 2008
  5. catgolfs

    catgolfs Karting

    Dec 1, 2007
    68
    Columbia, SC
    Full Name:
    Catherine
    #5 catgolfs, Jun 16, 2008
    Our of curiosity, did you just wash the car? If so, perhaps the ECU's somehow got a very small amount of water on them?

    You could be potentially masking another problem by turning up the RPM's. Thoughts?
     
  6. Gatorrari

    Gatorrari F1 World Champ
    Silver Subscribed

    Feb 27, 2004
    16,471
    Georgia
    Full Name:
    Jim Pernikoff
    #6 Gatorrari, Jun 16, 2008
    I had that problem shortly after I got my car, and the problem turned out to be with the ignition cut-off feature of the car's alarm system. If your car has a security system, check that out.
     
  7. Drew_4RE

    Drew_4RE Formula 3
    Owner

    Dec 19, 2005
    2,292
    FL
    Full Name:
    Drew
    #7 Drew_4RE, Jun 16, 2008
    I had a similar problem when i first got my car. Oddly enough what had happened was that I was using the A/C and the belt had broken. Not sure of the technicalities of what was happening but it would kill the engine when I had the a/c on.

    I know its a random chance, but could be the same issue...
     
  8. jimveres

    jimveres Karting

    Oct 31, 2003
    68
    #8 jimveres, Jun 17, 2008
    Thanks guys for the pointers. No, the car had not been recently washed. The problem shouldn't be the alarm as it doesn't feel like the ignition is being disturbed or disabled. I checked the A/C belt and it is fine. The problem happens if the A/C is on or off. The problem feels very fuel related.

    I haven't had a chance to check the throttle switch. I will do that this weekend. What does the throttle switch connect to and control?

    It seems like there should be a circuit that "holds the throttle up a bit" when you take your foot off the accelerator. What happens on my car now (and didn't used to) is that when I take my foot off the accelerator the RPMs rapidly crash down below 500 and then, most of the time, bounce back up to just under 1000 where they hold constant. What I thought used to happen when I took my foot off the accelerator was that the RPMs would drop steadily and settle at just under 1000.

    I'm guessing that there should be an air bypass valve that is supposed to let some air in for a bit of time when the throttle is first closed. I'm not familiar enough with the Bosch injection system to know how it allows RPMs to smoothly settle when the accelerator is released but I'm sure that there is an expert on this list that knows.

    Thanks for the help,
    Jim V.
     
  9. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,901
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #9 Steve Magnusson, Jun 17, 2008
    Last edited: Jun 17, 2008
    It "tells" the Lambda injection ECU that the throttle plate is in the fully closed position (i.e., that there's not much air entering) and to not reduce the fuel delivery so much (based on the O2 sensor output). It's the euro versions (without O2 sensors) that have another gizmo (the vacuum limiting valve) to ensure that the amount of air entering the engine doesn't drop to too low a value under closed throttle deceleration. There is no "smart" air valve on Bosch CIS controlled by electronics for normal warm-running conditions.
     

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