I was wondering if anyone else has had this problem. After about 40,000
> miles I noticed a spark knocking noise (not very loud) at around 40 to 60
> MPH. It seems to do it only when going up a hill or pulling a load, It last
> for about 3 to 4 mins then stops.
>
> After talking to MANY mechanics they pretty much all said, this is normal.
> The timing is controlled by a computer, and can not be manually adjusted,
> the computer lets the engine start to knock then adjust the timing.And they
> are QUICK to add if the computer was not adjusting the timing so often, you
> would get really bad gas mileage.
>
> OK..so is there a timing program version 2.0 that I need? :)
>
> Thanks for the help!!
> Marty
>
>
Marty,
The mechanics are partially correct. The computer advances the spark until it detects knock, then IMMEDIATELY retards it to a safe level. By immediately I mean within 1 second, so fast you usually don't even HEAR the knock. I'd run a bottle or two of Chevron Techron thru yer' gas tank (1 bottle treats 12 gallons, so use accordingly) and change out the fuel filter as well. If that doesn't clear it up post back.
Doc