Some of you may remember the yellow S4 I pulled a mullered cambelt off last year. Well, it's back today with a new owner. But I have a conundrum. Amongst other bits and pieces, he complained of a high idle, so I whipped out my Freescan and set to work. No CEL, but code 26. Either the CEL has blown or somebody removed the bulb (I have my suspicions). So, reset, ran the engine and got code 26 back immediately. Checked all the relays, powered the circuits, no fault found.
Then I suddenly got code 42 and the engine stuttered and died. Restarted, ran fine for a minute or so, then code 42 and died again. I could carry on all night - it starts, runs for a minute, then fails. During this time, code 26 keeps reappearing, but code 42 has now disappeared. CEL remains off.
I got desperate and swapped ECUs with my GT3 - same symptoms, and my GT3 runs fine on the S4 ECU. Phew! But what in blazes is going on? I can't find a thing wrong, all Freescan parameters look good, nothing disturbed except a few relays that shouldn't make any difference, but the engine only lasts lasts a minute or so - unless I clear the ECU by disconnecting the battery, then it lasts maybe 3 minutes.
Any ideas?
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Sparky
Member Since 04 Nov 2007Offline Last Active Yesterday, 08:26 PM





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