So I've still yet to get my tuning stuff as money has been too tight, so I haven't ventured into tuning my rich fuel levels. One problem I am still having with my truck is a retarding of my spark. I'm pretty sure the knock/esc is not the problem. Reason is, the knock sensor needs replaced, as it's not picking up knock. Therefore, it throws code 43, and from what I've read, automatically pulls timing.
Even when this happens and the timing is retarded there is still a further pulling of my timing happening. What I am trying to determine is whether it's something computer related, or something mechanical. Is there anything else in the computer that could pull timing even when timing has already been pulled due to the code 43?
In case it matters....I am getting this extra retard at idle as well as above idle.
Also, this additional timing retard is intermittent.
Info just as a reminder:
Suburban: 350 TBI '7747 $42
stock engine, with all new sensors except TPS which is in spec.
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