Re: Direct Ignition cassette or what? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Direct Ignition cassette or what?
Posted by Dean (more from Dean) on Tue, 18 Jun 2002 09:11:29
In Reply to: Direct Ignition cassette or what?, Andy D, Tue, 18 Jun 2002 02:46:31
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At higher boost, the breakdown voltage of a spark gap is higher, and those higher voltages may show up as weaknesses elsewhere in the ignition system. So the DI is a possibility, but its early for this to be happening to a 1998 model, but DI failure at 80K is probably not unheard of. (If you are going to keep the vehicle, and the miles WERE over 90, 95K, A new DI in the trunk might be a good idea anyways. If you did that, you could switch the two and evaluate. A working oil spare would be good to have even with a new on in service.)
Does you boost go to the beginning of the red, or well into it. A light high boost induced fuel cut would feel the same.
Also make sure that the battery is in good shape, connectors clean and electrolyte levels etc.
You could unseat and reseat the DIC connector, and check its connector surfaces for contamination etc.... but that has never been reported.
Your 7ES's sound very clean. If your fuel pump was weak and the pressure at high CFM's was a getting low, the would be consistant with cleaner plugs and perhaps the ECU is doing a fuel cut because the injector duty cycle is going out if mapping limits... but that is wild speculation. What is your mix of city VS highway miles? That influences the appearance of spark plug appearance.
Injectors clean?
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