1984 4k - no start

Tue Aug 4 14:15:20 PDT 2009

Shweet ebay find! I've emailed the seller to see if he carries the dist for the 84.

I went out to the car (just finished replacing upper links, tie rod ends and a cv boot on the A4 - its been a very tough Audi August ;)) to diagnose some more.

With a test light - I checked all 4 connections to the coil - they all lit up just fine.

Checked all the fuses just in case.

Put the cap back on the distr - and thought, ah what the heck lets see if anything has changed. She started right up - damn!

The only thing I've learned is that my fuses are good, the coil lights up the test light and the fuel pump seems to be behaving properly. I rolled under the car while blipping the throttle, it didn't seem to change noise.

Its still not running quite right though, under light acceleration it misses slightly (if your just cruising, maintaining a constant speed, 35 or so, although the speed seems to be irrelevant) - Under full throttle it seems to respond well - but I'd say its slightly under power. Like it wasn't getting full flame in the pistons or something - but its hardly noticeable...

My suspects right now remain:
-- ignition module
-- hall sensor/distr
-- fuel relay
-- coil (distant but possible contributor)

Although, I worry about the old wiring in this rig - there could be a break anywhere :\

Vittorio -

-----Original Message-----
From: L DC [mailto:ldc007usa at yahoo.com] 
Sent: Tuesday, August 04, 2009 4:28 PM
To: jlagnese at massed.net; quattro at audifans.com; Bares, Vittorio
Subject: Re: 1984 4k - no start

Check the hall sender connections at the distributor. If is loose, engine vibrations would be enough to cause intermittent failures.

In one of my VW QSWs (same engine and tranny- JT code- as in 4KQ) the plastic wheel inside the distributor broke, causing it to completely fail--no spark. It happened at a gas station right after filling the tank. I started the car and everything went dead 5 seconds or so later.

In any event, $175 just for the hall sender is ridiculous. You could get a whole rebuilt distributor for as low as $85 plus free shipping from e-Bay.  As with any purchase on the internet, especially automotive parts, make sure you contact the seller to make sure they send you the correct part. 

http://tinyurl.com/l6kvo7

-Regards,

-Louis

> From: Bares, Vittorio <Vittorio.Bares at nuance.com>
> Subject: Re: 1984 4k - no start
> To: jlagnese at massed.net, quattro at audifans.com
> Date: Tuesday, August 4, 2009, 3:22 PM
> Don't have a bentley for the 4k. I'm
> in s.NH. Would love to borrow 1 if u'r close by.
> 
> ________________________________
> 
> From: jlagnese at massed.net
> 
> To: Bares, Vittorio; quattro at audifans.com
> 
> Sent: Tue Aug 04 13:18:56 2009
> Subject: RE: 1984 4k - no start 
> 
> 
> I just plugged in another. Do you have an extra? If not,
> where are you? You could borrow one of my extras. I do have
> a few known working units. They are the same on quite a few
> VW/Audi. This went south on my 87 16V Scirocco. I actually
> used one from a 91 Jetta IIRC.
> 
> I'm sure that the Bentley has a way to check.
> 
> John
> ---- Original message ----
> 
> 
>     Date: Tue, 4 Aug 2009 12:25:43 -0400
>     From: "Bares, Vittorio" <Vittorio.Bares at nuance.com>
>     Subject: RE: 1984 4k - no start
>     To: <jlagnese at massed.net>,
> <quattro at audifans.com>
>     
>     
>     
>     
>     
>     
>     
>     
>     
>     
>     
>     
>     
>     
>     
>     
> 
> 
> 
>     How does one test that?
> 
> 
>      
> 
> 
>     Also, there was a suggestion to check
> the
>     12v at the coil - coil has 4 wires
> (2-green on one side, 2 black on the
>     other connector) - which ones deliver
> 12v to the coil? (they look awfully
>     thin)
> 
> 
>      
> 
> 
> 
> 
>     Vittorio -
> 
> 
> 
> 
> 
>     
>     
>     
> ________________________________
> 
> 
> 
> 
> 
>     From:
>     jlagnese at massed.net
> [mailto:jlagnese at massed.net]
> 
>     Sent: Tuesday, August 04, 2009
>     11:48 AM
>     To: Bares, Vittorio;
>     quattro at audifans.com
>     Subject: Re: 1984 4k - no start
> 
> 
> 
>      
> 
> 
>     Check the spark control unit. Its
> piggybacked on the computer.
>     ---- Original message ----
> 
> 
>     Date: Tue, 4 Aug
>     2009 10:42:59 -0400
>     From: "Bares, Vittorio"
>     <Vittorio.Bares at nuance.com>
>     Subject: 1984 4k - no start
>     To: <quattro at audifans.com>
>     >So, has new wires, rotor, cap, plugs
> - was running fine - then about a
>     >week ago, while driving it - it just
> stopped running.
>     >
>     > 
>     >
>     >I cleaned the contacts on the coil -
> started again, but wasn't running
>     >well. Almost as if it was running on
> 4 cyl (it is a quattro 5cyl :-)). I
>     >was trying to diagnose by pulling
> one sparkplug at a time while it was
>     >running, not much change when I did
> so - consistently for all 5 plug
>     >wires.
>     >
>     > 
>     >
>     >Pulled the plug on the temp sensor
> in the rear of the head - no diff.
>     >
>     >Pulled the plug on the sensor that
> is on the fuel distributor - no diff.
>     >
>     > 
>     >
>     >This morning - no start...
>     >
>     > 
>     >
>     >No spark.
>     >
>     > 
>     >
>     >I'm thinking hall sensor??
>     >
>     > 
>     >
>     >Vittorio -
>     >
>     > 
>     >
>    
> >_______________________________________________
>     >quattro mailing list
>     >http://www.audifans.com/mailman/listinfo/quattro

>     >http://www.audifans.com/kb/List_information

> 
> 
> 
> 
> 
> 
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