jjdward

Is it odd that the knock sensor code doesn't make the CEL come on?

The fuel trims have been around +/- 5. I'll try and track down the knock sensor issue.

Recently got a 99 k2500 flatbed, DRW,5 speed, with 245k. When I first got it, I did a tune up which helped a lot and then fixed a hot start issue. Its still got a rough idle and seems kinda weak while driving. I tested the fuel pressure yesterday and it was 48psi at idle down to about 42 when driving down the road. It doesn't cut out or bog down when driving just seems a little weak, but I've never had a 454 before. It starts right up no issues. No check engine light(bulb is good as it lights up with key on, not running) , but when I use scan tool it shows "P0327 Knock Sensor 1 Circuit Low Input (Bank 1). Any suggestions? Here at the things I've replaced: Plugs Wires Distributor ICM Coil MAF Fuel Pressure Regulator Both O2 sensors Both Knock sensors