Problems with 84 4KS

[Ti Kan]

b1biker writes:
> My 4KS refuses to run. It starts just fine and runs until the cold start =
> valve closes, 10-15 seconds, and just dies. It will resart almost =
> immediately. This process will repeat with progressively shorter run =
> times. If I let the car set for 10-15 minutes the whole process starts =
> over. I have discovered that the car is not strictly an 84. The engine =
> code is JN and some of the sensors are from 85/87. Any help on what =
> years the JN engine was used woulod be helpful as would any information =
> relating to testing of the various components of the fuel system. I have =
> replaced the fuel pump relay with no discernible effect on the problem. =
> I do not have a Bentley for this car only for 80-83 and find that none =
> of the information appears to be particularly pertinent.

Before you think about expensive repairs, first do the basics.  Check
all vacuum hoses and the big intake boot for vacuum leak.  Even a
small crack can cause this sort of problem.  Then, when you are certain
that there is no leak, change the fuel filters.  Then do a basic ignition
timing, fuel pressure/ mixture and idle speed diagnostic.  Follow the Bentley
manual's procedure and do not just make random adjustments.

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
-- 
    ///  Ti Kan                Vorsprung durch Technik
   ///   AMB Research Laboratories, Sunnyvale, CA. USA
  ///    ti at amb.org
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