Re: when to replace DI cassette - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: when to replace DI cassette
Posted by JustinHiFii (more from JustinHiFii) on Tue, 16 Sep 2008 21:39:37
In Reply to: when to replace DI cassette, Jayson, Tue, 16 Sep 2008 20:44:34
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You have a red DI for the Trionic 5 engine mngt system. They really only need to be replaced when they fail, keeping a good used or new unit in the trunk is always a good idea as they sometimes fail without warning.
Usually the check engine light will come on when the DI is failing as it is misfiring and causing the engine to run rough. In extreme cases, the CEL may flash since at this point at least one of the four coils are dead and your dumping raw fuel into the cat converter.
They do not always fail like this, as I recently replaced an original DI on a 95 9k Aero which had 110k on it. It would only miss under high boost levels at full thottle.
The crankshaft position sensor can also give you intermittent missing when the engine is running.
JustinHiFi
Strictly Saab
Melbourne, FL
posted by 70.119.47...
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