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DI inspection Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Mon, 7 Jun 2004 09:17:23 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Just a note for those DI-equipped cars out there-
My '92 finally suffered a DI failure. It was gradual and the car was quite driveable when I replaced it. It started as a slight misfire at low throttle settings/low rpm.
I inspected the DI by flipping it over and removing the plastic cover. Indeed, the oil level in each tube was quite low. A year ago I had inspected the DI coils, and they had good oil levels and showed no signs of leakage.
So if your DI is getting on in years/miles, I suggest doing an inspection every 6 months or so. It only takes a few minutes. Check the oil levels. Also look at the TOP of each spark plug - look for any signs of carbon or burning. There is no question that too big a spark plug gap will kill a DI. The DI coil connects to the top of the plug via a spring. If that spring gets tired, the connection will be poor, and this is the equivalent of increasing the plug gap. I had signs of carbon buildup on one plug and on the mating surface of the corresponding coil, telling me that the spring wasn't making good contact.
Will this keep you from ever having a sudden DI failure? Probably not. But for a decent number of failures, it should give you enough warning to get a new cassette before you get stranded.
Heck, if the DI is out, check those plug gaps. I have found plug gaps to open up in as little as 10K miles. So don't assume that plugs can go untended for 30K or more.
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