spark knock problem

[tomtom72]

I'm lost on this one guys and would be thankful for any advice.

When my 90 is all up to temp I get this spark knock during part throttle. It happens at part throttle with a moderate load like going up hills at less than 40 mph in 4th or 3rd. Sometimes I can even hear it on level ground at the same mph if I'm in 4th and give it small throttle input. I would like to add that this happens regardless the chip I use in the ECM. I have 3: AUAH, AYBK, and Marc's generic mail order piggyback.

I am not getting any DTC's, let alone the ones that signal a knock sensor problem. It has done this as long as I have owned the car. It seems to me the hotter the air temp gets, the worse this knock gets. Above 80* air temp is when, cooler air and it doesn't seem to do it...but I don't know if that is related to anything?

I used to put it down to the odd bad dose of fuel, but I try to stick to the name brands from stations that I know to move volume.

I have a new knock sensor that I was going to put in, but I was thinking what do I do if that doesn't address this issue? I was thinking that I could hook up the scanner and drive around and when the knock happens give a glance to see if it gives me anything to go on? I'm not real sure what to look for, knock events or what? My scanner has a line items "Knock Counts" and "Knock Retard".....is that what I should be looking at? TIA


Tom

I just want to state something so that there is no doubt about Marc's piggy-back thing. My car has done this since I bought it, AUAH or AYBK not withstanding. I just got a really bad load of gas last week and it kind of brought this to a head for me. The bad gas is gone and the knock is back to it's normal symptoms which the car had before I bought Marc's "chip" thing. I don't want anyone seeing this and connecting the knock issue to Marc's chip.