2001 B1500 V6 Misfiring at Idle
#1
2001 B1500 V6 Misfiring at Idle
Hello,
Looking for some help as I've been circling around this one for a while.
This summer I started getting misfire codes. Usually cylinder 3, sometimes cylinder 4. Sometimes a general misfire code. Initially I would change something and clear the code and it wouldn't return for weeks.. Now it comes back consistently.
As far as I can tell the misfires are only at idle. Idle is very rough and the engine doesn't drop when I disconnect the wires from cylinder 3 or 4. If the throttle is open then it does drop. Idle has gotten worse over time, sometimes stalling out now or slow to accelerate. Highway driving has been fine.
This started after I had replaced the plugs and wire-set so I initially thought it was ignition, but I've been up and down on the ignition system since then and am confident it is not. It seems like a vacuum issue as it only appears present at idle. I've gone over the hoses several times and tried spraying with carb cleaner and I haven't had any luck finding anything.
Looking for some tips of what to chase next or how.
Parts replaced recently:
Spark Plugs (correct gap)
Wire-set
Distributor Cap
Ignition Coil
Crankshaft Position sensor
Throttle Position Sensor
Valve Cover Gasket (leaky, scraped out lots of carbon)
PCV Valve
Throttle Body Injector Gasket (was cracked)
The PCM recently died and was replaced
Diagnosing:
Good Compression Test
Good Fuel Pressure
Moved plugs and wires and misfire did not move
IAC Valve seems to be working
Check valve to HVAC functioning
All Fuel Injectors are pulsing
Looking for some help as I've been circling around this one for a while.
This summer I started getting misfire codes. Usually cylinder 3, sometimes cylinder 4. Sometimes a general misfire code. Initially I would change something and clear the code and it wouldn't return for weeks.. Now it comes back consistently.
As far as I can tell the misfires are only at idle. Idle is very rough and the engine doesn't drop when I disconnect the wires from cylinder 3 or 4. If the throttle is open then it does drop. Idle has gotten worse over time, sometimes stalling out now or slow to accelerate. Highway driving has been fine.
This started after I had replaced the plugs and wire-set so I initially thought it was ignition, but I've been up and down on the ignition system since then and am confident it is not. It seems like a vacuum issue as it only appears present at idle. I've gone over the hoses several times and tried spraying with carb cleaner and I haven't had any luck finding anything.
Looking for some tips of what to chase next or how.
Parts replaced recently:
Spark Plugs (correct gap)
Wire-set
Distributor Cap
Ignition Coil
Crankshaft Position sensor
Throttle Position Sensor
Valve Cover Gasket (leaky, scraped out lots of carbon)
PCV Valve
Throttle Body Injector Gasket (was cracked)
The PCM recently died and was replaced
Diagnosing:
Good Compression Test
Good Fuel Pressure
Moved plugs and wires and misfire did not move
IAC Valve seems to be working
Check valve to HVAC functioning
All Fuel Injectors are pulsing
#2
I had this same issue for years; it drove me crazy. It ended up being the crank sensor, even though I replaced it several times, only to end up with the same misfire codes. The best option is an OEM one from the dealer, the second-best option is to try a different brand from a different auto parts store.
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