88 328 rebuilt wur stalls out after warm up | FerrariChat
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88 328 rebuilt wur stalls out after warm up

Discussion in '308/328' started by fastcarslowride, Apr 13, 2013.

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  1. fastcarslowride

    fastcarslowride Karting

    May 21, 2012
    50
    #1 fastcarslowride, Apr 13, 2013
    I rebuilt the wur and now after the car warms it doesn't want to stay at idol it wants to stall out if I keep a little gas on it it will stay running it runs just fine before warm up. Any ideas?
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,834
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Apr 13, 2013
    Last edited: Apr 13, 2013
    What version 328? US (black fuel distributor = K-Jet with Lambda) or euro (silver fuel distributor = K-Jet without Lambda)?

    Are you saying:

    1) that after the WUR rebuild, the cold and warm control pressures were verified as OK, and

    2) now (with the problem), the cold and warm control pressures still measure OK?
     
  3. fastcarslowride

    fastcarslowride Karting

    May 21, 2012
    50
    #3 fastcarslowride, Apr 19, 2013
    Its US and yes after installing rebuilt wur the cold and warm are good . took the car down the road to my brothers and once it was warmed up it did not want to stay at idle to fiinish getting there I had to keep my foot on the gas to keep going at stops
     
  4. andyww

    andyww F1 Rookie

    Feb 7, 2011
    2,775
    London
    #4 andyww, Apr 19, 2013
    Were any adjustments made which might have incorrectly been done to compensate for the faulty WUR?
    For example maybe the faulty WUR was causing the mixture to be too rich when hot and this was leaned incorrectly by adjusting the mixture screw?
    Maybe check CO / HC readings.
     
  5. umsneeze

    umsneeze Formula Junior

    Nov 16, 2004
    449
    Knoxville, TN
    #5 umsneeze, Apr 19, 2013
    Mine did something similar after rebuild and turned out to be fried rotor. It was two different failures in short time.
     
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,834
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #6 Steve Magnusson, Apr 19, 2013
    Have you checked to see if the frequency valve is "buzzing" when the fuel pump is running? -- i.e., unplug the safety switch on the airflow metering device, turn key "on" (engine not running) = you should hear the fuel pump run = then touch/feel the frequency valve to confirm/deny if it is buzzing. If it is (correctly) buzzing (but you still have the runability problem), then you are left with going back to remeasure the cold and warm control pressures to see if they've changed from before. JMOs.
     
  7. fastcarslowride

    fastcarslowride Karting

    May 21, 2012
    50
    #7 fastcarslowride, Apr 24, 2013
    I checked the fuel mix by testing o2 sensor and got it within range and the car seemed to be fine drove it for about 20 miles and then started noticing the same little miss . so I started looking around the engine bay for anything I might have missed and I noticed the 19 mm hose that goes from the intake just after the filter and before the large hose going to the manifold after the tee but before the metal line that goes under the manifold, was collapsed. So I replaced it with the proper hose and it drove better than it has in a while . so I drove around town several different places over a few hours . no problems. So I get on the freeway to go home about 5 miles away. About two miles into it I start getting a very small miss. I am going to check fuel mix again since hose replaced,and it seemed like it was a little ruff idle when I pulled in to hthe driveway not much though. This has been driving me half crazy
     
  8. fastcarslowride

    fastcarslowride Karting

    May 21, 2012
    50
    #8 fastcarslowride, Apr 24, 2013
    I did check the rotors when I did the new wires. I will go back and check them
     

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