Gotcha. Isnt that about where Street Leathers used to be? The rent costs are nuts around here.

They're just south of me. I'm up in Grants Pass. What was the name of your shop?

Here is where we're at. I tried the knock sensor unmounted but plugged in. 0 knock with the exception of a knock count of 80 only when in 5th gear and 100% throttle. That tells me that my knock...

Just the one. I was reading today about the map sensor values being used for fuel and timing tables. I have a couple of those here so I might just swap it to see if there any changes. I'm just having...

Any thoughts as to calculated knock as opposed to actual knock? Perhaps something that is based upon a correlation between map, maf and TPS to calculate engine load?

Would that account for the low timing? I've used 2 different Snap On scanners, solus and a newer one that came out a couple of years ago and an OTC Encore. The OTC is crap if anyone is curious.

Is it possible that the pcm isn't actually sensing knock but applying a knock value based upon engine parameters?

I depinned it at the pcm and I still have knock according to the data. I also ohmed the wiring and wiggled the harness and it never flickered the ohmmeter.

So this isn't a repost. Someone suggested that I smoke check the evap system so I did that. I've used 2 Snap On scanners and an OTC to verify the data. I didn't swap PCMs because I realized that I...

I did everything including the fuel filter as basic maintenance on a new to me vehicle within 1000 miles of purchasing. The only non AC Delco parts are the spark plugs. Nothing has changed the...

I smoked it today. No leaks. Thanks for the idea though!

I should add that the knock sensor was only unplugged for testing. I wasn't going to leave it that way.

Here we go. I swapped the MAF with a known good one with no change. I grabbed the scanner and went for a drive. I noticed knock counts of 3-5 at full throttle and timing was 11-13 degrees. Under...

I've had 4.3 engines with 3.42 gears in full size trucks and 31 inch tall tires that were peppy. I had a 91 longbed on 245/75/16 that would leave about 25' of rubber at a 5 mph roll and actually...

I'm copying this from another forum in order of my posting.



262ci Forum (4.3)
Something feels like it is holding my truck back.
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Skylark

Hi guys. I'm a long time GM guy. I've owned 250+ vehicles. My wife and I currently own 15 vehicles, 12 of which are 88-03 Chevy and GMC trucks and SUVs. I'm here for a bit of help with my 02 S10.