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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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