Re: O/T- 1984 Chevy 6.2...........

Posted by jdemaris on November 02, 2006 at 18:03:53 from (69.67.235.89):

In Reply to: Re: O/T- 1984 Chevy 6.2........... posted by Bob on November 02, 2006 at 14:06:25:

I don't know of a good reason why it was ever needed - in the GMs that is. Same switch does work well in my Isuzu diesels for the fast-idle circuit.
All it does is prevent the plugs from working once the temp. is over 120F. But - it either HAS to work - or it needs to be bypassed/eliminated.
Just about all the later diesels cycle (fast cycle) the plugs on and off at any temperature to keep emmissons down.
That little fact just about drove me nuts when I first got my 94 F250 with the IDI 7.3 turbo-diesel. Every time I start it, warmed up or not, the voltmeter jumps all over the place but "cures" iself after about 30 seconds. Not being a Ford lover anyway - I was expecting some weird electrical problem that I could forever blame on Ford Mo. Co. That is, until I discovered it is the normal draw of the "afterstart" cycling glow-plug system making the needle jump. I knew the European deisels use the system - but hadn't known the newer US stuff does also. None of my 6.2 do, nor does my 85 F250 with the 6.9 diesel.

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