I bought the truck from a mechanic back in April and it was pretty much straight piped so I never heard a knock if it was present. I haven't driven it since I bought it because I wanted to baseline it.
I've replaced full exhaust with cats and Denso O2 sensors, spark plugs, wires, valve cover gaskets/tube seals/TB gasket, distributor cap/rotor/o-ring/dust shield, crank pulley seal/oil pump seal, water pump/all cooling and heater hoses, fuel filter/fuel pump, PCV, vacuum modulator and lines, charcoal canister hoses, AC idler pulley and belts.
When I started it after these repairs, I heard the knock. It's not necessarily a rough idle but it's a bit lumpy. Tried checking for vacuum leaks using propane, checked the EGR, checked timing(set to 3), cleaned MAF, pulled EFI fuse for a few minutes, no check engine light comes on no matter what I do. The light works and can be seen in the ON position but no codes come up even if I disconnect the O2 sensors.
What am I missing? What should I look for? Additional note, Airbag light is on and no amount of Tc/AB grounding has turned it off. I don't see any dummy sensors or resistors for the O2 at the connectors. Need to order a belt gauge to make sure my belts are to spec.
I've replaced full exhaust with cats and Denso O2 sensors, spark plugs, wires, valve cover gaskets/tube seals/TB gasket, distributor cap/rotor/o-ring/dust shield, crank pulley seal/oil pump seal, water pump/all cooling and heater hoses, fuel filter/fuel pump, PCV, vacuum modulator and lines, charcoal canister hoses, AC idler pulley and belts.
When I started it after these repairs, I heard the knock. It's not necessarily a rough idle but it's a bit lumpy. Tried checking for vacuum leaks using propane, checked the EGR, checked timing(set to 3), cleaned MAF, pulled EFI fuse for a few minutes, no check engine light comes on no matter what I do. The light works and can be seen in the ON position but no codes come up even if I disconnect the O2 sensors.
What am I missing? What should I look for? Additional note, Airbag light is on and no amount of Tc/AB grounding has turned it off. I don't see any dummy sensors or resistors for the O2 at the connectors. Need to order a belt gauge to make sure my belts are to spec.