Hi,

With apologies to TxG (whose favorite subject is Mobil 1 and least
favorite subject is DI death), I will repost information which was
posted by someone who experienced DI death which left him stranded in
precarious circumstances. The thread was accidentally deleted during
upgrades to BB system.

He was stating that he had earlier experienced problems with electronic
throttle as well.

The best information we have thus far is that DI is being killed by
excess heat. Sometimes heat kills DI instantly, and sometimes DI is
cooked slowly and the symptoms of the cooking show up later.

One thing which helps prevent DI death is small spark plug gap (about
0.9mm is recommended). This is because plug gap determines maximum
voltage experienced by secondary coil. Until spark jumps the gap,
secondary coil + gap act as a simple circuit consisting of inductor and
capacitor. The greater the gap, the greater the capacitance of spark plug
gap. The higher voltages result in greater heat (wasted energy) which can
fry the semiconductors which form the capacitive discharge ignition system.

All evidence and logic points to the fact that small spark plug gap
does not completely eliminate DI death.

Instant death usually happens in hot summer months. DI death resulting
from slow cooking and resulting unreliability happens at any time of year.

thanks

Jae

posted by 167.4....

• DI Death, J, Wed, 11 Dec 2002 18:05:26 <-- Viewing This Message
  • Feeding time at the shark tank, TG, Thu, 12 Dec 2002 19:10:15
    • Talk about feeding frenzy ..., J, Thu, 12 Dec 2002 23:27:51
    • Hey ... we can't talk about Mobil 1 all day EVERY day., J, Thu, 12 Dec 2002 23:23:12
  • Is this a problem with the V6 as well?, Simon in Vancouver, Thu, 12 Dec 2002 13:38:18
  • Is this a problem with the V6 as well?, Simon in Vancouver, Thu, 12 Dec 2002 12:49:46
    • Don't worry ..., J, Thu, 12 Dec 2002 13:09:00
      • Uhm, Genuine GM Parts?, Stephen Goldberger, Thu, 12 Dec 2002 21:00:10
        • You may be right ..., J, Thu, 12 Dec 2002 21:25:37
          • Re: You may be right ..., dtech, Fri, 13 Dec 2002 07:01:02
      • Was that me? I have changed one set of V6 DI cass, Anders, Thu, 12 Dec 2002 17:14:54
  • Aftermarket DI ?, robp, Thu, 12 Dec 2002 10:12:52
    • Re: Aftermarket DI ?, Jason 0W-40, Thu, 12 Dec 2002 10:58:01
      • Hehehe, I be thinkin' the same thought, robp, Thu, 12 Dec 2002 13:14:35
    • Re: Aftermarket DI ?, dtech, Thu, 12 Dec 2002 10:32:26
  • Re: DI Death, Davec, Thu, 12 Dec 2002 09:10:35
    • Your old VW did not have a DI or Trionics, TG, Thu, 12 Dec 2002 18:57:02
    • Re: DI Death, dtech, Thu, 12 Dec 2002 09:42:33
      • Interesting point about T8, No.9, Thu, 12 Dec 2002 13:02:00
        • Re: Interesting point about T8, dtech, Thu, 12 Dec 2002 13:16:35
          • Re: Interesting point about T8, No.9, Thu, 12 Dec 2002 13:31:12
            • Re: Interesting point about T8, dtech, Thu, 12 Dec 2002 14:21:32
      • What gets me though in this DI failure debate is that>>, Anders, Thu, 12 Dec 2002 11:32:15
        • '96 9000 still going strong on original DI, AdamB , Fri, 13 Dec 2002 11:59:48
        • Re: What gets me though in this DI failure debate is that>>, TG, Thu, 12 Dec 2002 18:48:48
          • Never had a harness fail on the early ones., Anders, Thu, 12 Dec 2002 19:14:37
        • Is there a way to test the DI, Jason 0W-40, Thu, 12 Dec 2002 13:02:16
          • No, not for a grassroot mechanic like me, they don't, Anders, Thu, 12 Dec 2002 15:08:57
      • Re: DI Death, Ron H, Thu, 12 Dec 2002 10:56:45
        • Re: DI Death, dtech, Thu, 12 Dec 2002 11:21:22
          • re: DI death, Ron H, Thu, 12 Dec 2002 13:37:23
    • Re: DI Death, washaero, Thu, 12 Dec 2002 09:25:28
    • Distributor Death, robp, Thu, 12 Dec 2002 09:24:35

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