2001 Chevrolet Silverado 2500 HD Q&A

2001 Chevrolet Silverado 2500 HD Question: Engine misfire

I have a random misfire code. But if you watch it on a scan tool its only the driver side usually cylinder 1 and 3. I have replaced all 8 plugs and wires. I have replaced all 8 injectors, and i have replace the coils for cylinder 1 and 3. The truck still only misfires. But it only misfires after you have driven it for a while and you shut it off then restart it. Pretty much your tipical gas fill up is enough time for it to misfire when you start the engine back up. But if the truck sits long enough it will not misfire or if you take it up the road and beat on it a little it will clean out and run fine until the next time you shut it and start it back up quickly. What could it be? The only other thing i could think of is that the cat is getting plugs when it gets hot and making the engine miss. But that still doesn't explain why it only does it after you shut it down hot. -
Answer 1
lots of problems with the cat causing missfires. have a shop check your cat for failure. there is a left and right cat and can be replaced separately. Roy -
Answer 2
CHECK THE FUEL PRESSURE REGULATOR. PULL THE VACUUM HOSE OFF. IF GAS RUNS OUT THEN REPLACE REGULATOR. -
Related Items:
Been having problems with the truck running rough at an idle for 3 weeks, as well as the service engine soon light coming on. Hooked to diagnostics, which showed cylinder #2 misfire. Changed spar...
Check engine light came on, hooked it to the computer and it said it was #6 then #5 glowplugs...pulled the glowplugs out and tested them only one did not ohm out...I didnt want to go buy new glowpl...
I have replaced the fuel pump four times once a year and crankshaft sencer. charcol canister. fuel relays replaced and still lugs and back fires when give it gas or pull hills. can enyone help. no ...