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1994 VW Jetta III cranks and won't start



 
 
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Old June 11th 07, 05:58 PM posted to rec.autos.makers.vw.watercooled
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Default 1994 VW Jetta III 2.0 auto cranks and won't start

On Jun 8, 2:25 am, Tom's VR6 > wrote:
> In rec.autos.makers.vw.watercooled, wrote:
>
> >long before it died my jetta would behave like a barometer, running
> >erratically on a humid day, misfires, hesistation.. etc. now it only
> >makes sense if a failing ECU is resposible for that..

>
> That sounds like a coil pack.
>
> > why did VW
> >engineers decided to hide the engine computer under the rain gutter is
> >beyond me, did they set up their home computers in a barn too?
> >sheesh!!!

>
> Putting the computer in the engine compartment reduces the number of
> wires running thru the firewall.



hi all,

i got into some serious seff-doubt after reading your replies, so i
tried one more time before heading to ebay... or a junk yard

i gave my cheap multimeter a fresh 9 v battery, carefully selected the
proper scale and again measured the crankshaft sensor resistance. it's
529 ohms and i was able to confirm the specs as 540 ohms +- 40 ohms

then i inspected the 3-pin connector that goes to the ignition module.
pin 3 is a steady 12V, pin 1 is a steady ground, pin 2 is controlled
by the ECU and provides disruptions to ground with an approximately 6
kilo ohms resistance when connected. i hooked up the circuit tester
between pin 3 and 2 then cranked the engine, guess what?? the light
bulb never flashed!!!

that's it, no spark because the primary coil's current never had the
disruptions that excite the secondary coil. i can have a super duper
coil and still no spark... and since the crankshaft sensor is good,
the ECU must be bad...

my 1994 jetta III has a distribution system, it's not using a coil
pack. by the way i think the coil pack is a very ill-concieved idea
unless each coil can be inspected and replaced individually... but why
coil pack??? sheesh!!! ignition by distribution has been around for as
long as automobiles are...

oh i can definitly see the point of mounting the ECU in the engine
compartment but i think i'd wrap my replacement ECU in saran... lol

and i started to wonder if there's a VW conspiracy... i did some
google and found out that some folks were flabbergasted when they took
their dead VWs to the dealers only to hear them talk in a different
language, the dealer would then refer to the crankshaft sensor as
impulse sender, and camshaft sensor as hall sender, and they never
suggested ECU problems as if those things would never fail... such
BS!!!

yeah the RF interferences theory concerning split fire plugs sounds
ridiculous, but the things certainly fail to provide fuel economy as
promised. i'll stay away from them.. bosch has a different approach to
a multiple-electrode spark plug, but i think it just a part of
automobile bull sh*t marketing...

anyway, a friend of mine told me about a yard in houston that hosts
many junked VWs, i'll come by and see this afternoon

just wanted to post a follow up...

 




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