[s-cars] No start, no spark - 1987 5KS with NF engine

Grant Lenahan glenahan at vfemail.net
Sun Apr 19 14:17:48 PDT 2009


i read twice, quickly. You never mentioned the infamous ignition switch.

Did you swap it? Its largely un testable.

Grant
On Apr 19, 2009, at 4:15 PM, Dave C wrote:

>  <200q20v at audifans.com>
> Folks,
>
> I'm about at the end of my rope in trying to find the cause of this no
> start, no spark problem. This car is a 1987 5KS with NF engine and  
> CIS E-III
>
> The car always ran fine and then began to act up about a few weeks  
> ago...
> failed to start once or twice, but later would start and run as  
> normal. Shut
> it off and maybe it would start again, maybe not. Now for the past  
> couple
> weeks I haven't been able to get it to start at all. I checked for  
> fault
> codes several times and got none ... just 4444. The battery has  
> lots of
> juice and the starter cranks the engine nice and fast.
>
> There is no spark from the coil. I tried various tests as described in
> Bentley ... coil, power stage (ignition booster?), and a few other  
> things. I
> swapped various parts including:
>
> Knock sensor control unit (aka ICU, aka electronic ignition control  
> unit) in
> drivers side footwell
>
> ECU (fuel injection control unit)- in the passenger footwell
>
> Coil incl power stage (ignition booster)
>
> Distributor ... although I don't think that has anything to do with  
> lack of
> spark at the coil
>
> I checked the grounds in the engine compartment, all looked OK,  
> cleaned them
> up anyway.
>
> Checked all wiring connectors at coil, distributor, etc
>
> Examined all related wiring that I can see/identify for obvious  
> signs of
> damage ... all looks OK.
>
> Bentley's test of the ignition coil seems to indicate either a bad  
> ICU, or
> damaged wiring to the ICU. I checked for continuity in the wire  
> between the
> coil and the ICU and it's OK. I swapped the ICU with another one  
> out of a
> car that runs fine and the car still won't start.
>
> The only remaining thing I can think of is a broken/damaged wire  
> somewhere,
> maybe inside the harness. But where to look?
> I'm very close to giving up and having it towed to an Audi specialist.
> Admittedly, I'm not a pro ... it's possible I'm not doing the tests
> correctly, and my wire diagram skills are not the greatest.
> Does anyone have a suggestion re: what I might have missed? A likely
> location for a damaged wire? Anything at all?
> thanks,
>
> David Conner
>
> Columbus,OH
> 87 5KTQ
> 89 100 NF engine
> 87 5KS NF engine
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Grant Lenahan
glenahan at vfemail.net
(201) 602-4702 mobile






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