Hi Neil, Is it running on because the ignition is still on, or is it "run-on" caused by pre-ignition AKA dieseling??? It's quite possible for a hot engine to continue to run without spark. Usually that's a sign of WAY too much heat in the combustion chamber, whch could be caused by a lean-running FI/Carb, bad timing, the wrong spark-plug or some other malfunction. Most of the Bosch FI systems I know of should have provisions to prevent dieseling but I am not sure if yours is one of them, so I thought I'd throw this out there. Happy Trails, Greg Potts 1973/74/79 Westfakia "Bob the Tomato" 1987 Wolfsburg Weekender Hardtop www.busesofthecorn.com www.pottsfamily.ca
neil N wrote: > Hi all. > > Just took my VanaJetta for a real test run. Runs much better now! > > Ignition switch is fairly new, worked fine before conversion, and if > "new" engine cold-warmish, works fine. > > When engine hotter after short hwy. run, it won't shut off. > > I put in a separate relay to supply power to Jetta ignition coil. > > I suspect heat as the culprit. > > If a relay gets too warm-hot, would this cause it to stay "on"? > > Here's a pic of relay box/exhaust: > > http://tubaneil.googlepages.com/exhaust.jpg/exhaust-full;init:.jpg > > Maybe relay box is too close to exhaust or exhaust too exposed. > > Would a heat shield on exhaust or relay box help that much? > > |
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