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Re: horrible gas milage and more
Posted by saabmedic [Email] (more from saabmedic) on Sat, 9 Feb 2013 19:48:19
In Reply to: Re: horrible gas milage and more, burky23, Sat, 9 Feb 2013 11:09:43
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The IDM consists of the 4 coils and circuits that monitor the ionisation when the plugs fire. This tells T7 which plug is firing, (simulated crank sensor) and if there is preignition. When these circuits fail after time from the heat, T7 sets one or more codes, P0340,P1312,P1334. With P0340 present, T7 opens all 4 injectors together every rev. just like an old 900 or 9000 instead of individually just prior to firing. P1312 and 1334 cause T7 to retard the timing and reduce turbo boost to avoid preignition.
P0340 should have only minimal effect on consumption, P1312/1334 more effect. The front O2 sensor trims the actual fuel delivery and can have a major effect on fuel consumption.
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