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1994 VW Jetta III cranks and won't start



 
 
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  #11  
Old June 11th 07, 05:58 PM posted to rec.autos.makers.vw.watercooled
external usenet poster
 
Posts: 67
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...

Ads
  #12  
Old June 11th 07, 07:15 PM posted to rec.autos.makers.vw.watercooled
Tom's VR6
external usenet poster
 
Posts: 129
Default 1994 VW Jetta III 2.0 auto cranks and won't start

In rec.autos.makers.vw.watercooled, wrote:

>
>
>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...


The coil pack has the *theoretical* advantage of no moving parts.
Also, one coil or drive transistor could fail and let a six cylinder
engine limp home. (not sure about a 4).

The coil packs have been notorious at flash over during humid
conditions, which then burned carbonized tracks into the insulator.
That same sort of thing could happen with a single coil, but with a
single coil there is probably more room to allow a bigger flash over
path. Your description of running badly with humidity made me think
of my experience with coil packs.


>
>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!!!


Let's see if that new computer fixes your car. Good luck.

If you can start then, I would still look at the engine in the dark
to look for flash-overs on coil, distributor or wires. If the
weather is not foggy, make your own fog with a water mist.

  #13  
Old June 14th 07, 02:04 AM posted to rec.autos.makers.vw.watercooled
external usenet poster
 
Posts: 67
Default 1994 VW Jetta III 2.0 auto cranks and won't start

On Jun 11, 2:15 pm, Tom's VR6 > wrote:
> In rec.autos.makers.vw.watercooled, wrote:
>
> >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...

>
> The coil pack has the *theoretical* advantage of no moving parts.
> Also, one coil or drive transistor could fail and let a six cylinder
> engine limp home. (not sure about a 4).
>
> The coil packs have been notorious at flash over during humid
> conditions, which then burned carbonized tracks into the insulator.
> That same sort of thing could happen with a single coil, but with a
> single coil there is probably more room to allow a bigger flash over
> path. Your description of running badly with humidity made me think
> of my experience with coil packs.
>
>
>
> >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!!!

>
> Let's see if that new computer fixes your car. Good luck.
>
> If you can start then, I would still look at the engine in the dark
> to look for flash-overs on coil, distributor or wires. If the
> weather is not foggy, make your own fog with a water mist.


thanks tom

if automobiles makers realise that they can't get away with putting
lighter duty coils in a coil pack then i'd say coil pack design is
superior to distributor.. i'm sure they know well about statistics as
far as reliability is concerned but reducing bill of material still
their number 1 priority..

anyways, i believe my ECU was shot and a new ECU will fix my car..

i went to benltley publisher's site and found this thread.. the guy's
experiences with his 98 jetta is similar to mine,
and dave was right, OEM ign coil works when after market units don't..
it's all about the ign module working in conjunction, i guess.. but i
havent replaced mine yet..

http://tech.bentleypublishers.com/th...art=0&tstart=0

and then i found a used bosch ECU with matched part number on ebay for
$47 shipped.. bought it and now i'm wating for it to arrive

if it can run, i'd do a water mist just to see what's going on, but i
can never forget that the only times that my german lady quit on me
was when she's given a steam bath.. lol

will let you guys know how it'll go...

  #14  
Old February 1st 16, 11:17 PM posted to rec.autos.makers.vw.watercooled
Hulk
external usenet poster
 
Posts: 1
Default 1994 VW Jetta III 2.0 auto cranks and won't start

replying to bi241, Hulk wrote:
VW should be accountable for this failed electrical system

--
posted from
http://192.168.0.216/vw/1994-vw-jett...art-39162-.htm
using MotorsForum's Web, Mobile and Social Media Interface to
rec.autos.makers.vw.watercooled and other automotive groups

  #15  
Old May 25th 17, 11:18 AM posted to rec.autos.makers.vw.watercooled
Enrico stoffels
external usenet poster
 
Posts: 1
Default 1994 VW Jetta III 2.0 auto cranks and won't start

replying to bi241, Enrico stoffels wrote:
Hi can u hlp me my jetta 3 crank but will not start

--
for full context, visit http://www.motorsforum.com/vw/1994-v...art-39162-.htm


 




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