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328 Slow Down light

Discussion in '308/328' started by NW328GTS, Jul 5, 2011.

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  1. NW328GTS

    NW328GTS Formula 3

    Nov 16, 2009
    2,191
    Washington
    Full Name:
    Hal
    #1 NW328GTS, Jul 5, 2011
    my Slow Down light came on at start last night and never went out on my 1987 328 GTS. Since it came on at start it seems a pretty straight forward enough conclusion that the cat is not overheated.

    I found some old trouble shooting threads about the system and found the CCCU on a parts chart but I have no idea where the cat control box is actually located physically on the car... seems simple enough to trouble shoot to see what needs fixing but I don't know where to look for it.

    Sometimes the simplest things are the hardest.

    any help greatly appreciated.
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,944
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #2 Steve Magnusson, Jul 5, 2011
    See Fig 64 in your 328 US OM -- it's mounted to the same plate (in the floor of your rear trunk) that holds the K-Jet with Lambda ECU.
     
  3. NW328GTS

    NW328GTS Formula 3

    Nov 16, 2009
    2,191
    Washington
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    Hal
    #3 NW328GTS, Jul 5, 2011
    Thanks Steve for ALL of your contributions here. I really appreciate your help
     
  4. mike996

    mike996 F1 Veteran

    Jun 14, 2008
    6,912
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    Mike 996
    #4 mike996, Jul 5, 2011
    The fact that that box is not fixable/replaceble is the reason I removed the cat from my 328 and installed a straight pipe. Not having a working warning system for that function made me too nervous to leave the cat in place. Fortunately, my 328 qualifies as a "historic" car in MD (20 years old) and so it no longer has to pass emissions tests.
     
  5. Robz328

    Robz328 F1 Veteran
    Rossa Subscribed

    Mar 16, 2009
    6,299
    ATL, Georgia
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    Rob Hemphill
    #5 Robz328, Jul 5, 2011
    Whose straight pipe did you use, and did you retain your O2 sensor (if so, how well does it work).
     
  6. mike996

    mike996 F1 Veteran

    Jun 14, 2008
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    Mike 996
    #6 mike996, Jul 5, 2011
    Pipe's from Ricambi - yes, the O2 sensor and the thermocouple attach as per normal (even though the thermocouple has nothing to monitor anyway but it's more elegant than removing it or wiring it up out of the way.
     
  7. Robz328

    Robz328 F1 Veteran
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    Rob Hemphill
    #7 Robz328, Jul 5, 2011
    TX Mike.
     
  8. NW328GTS

    NW328GTS Formula 3

    Nov 16, 2009
    2,191
    Washington
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    Hal
    #8 NW328GTS, Jul 6, 2011
    here in WA, its 25 years... I might have to wait a year if I cant get the slow down light to work... I agree that the straight pipe makes more sense than fixing the cat warning system for $700.

    Just out of curiosity... did the straight pipe have any effect on the noise levels of the exhaust?
     
  9. mike996

    mike996 F1 Veteran

    Jun 14, 2008
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    Mike 996
    #9 mike996, Jul 6, 2011
    No - not that I could tell. Maybe if you had two cars side by side with/without a cat you might be able to hear a difference but I didn't notice any change in driving it.
     
  10. f1nxlife

    f1nxlife Formula Junior
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    May 11, 2010
    258
    harbor city ., calif
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    brett falcigno
    #10 f1nxlife, Jul 6, 2011
    Last edited: Jul 6, 2011
    talk to Patrick at FERR PARTS,i bought a real nice LARINI test pipe,,,its got a nice stainless finish,,and i paid 189.00 for it...916 974 1939,,,the Larini is top of the line...and its got all the sensor fittings..TUBI and the test pipe sound the best,,,,my exhaust note did change for the better when i added the pipe to the Tubi...your car will also run cooler in traffic ........LAX tunnel video soon to follow.,but ill tell you,,the car sounds pretty sick echoing inside the tunnel under LAX..and i have to record it..
     

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