Cjw02001

Hey guys I am throwing a P0301: Cylinder 1 misfire detected Error Code. Some times this is also accompanied by a Bank 1 too Lean as well. I was wondering what if any insight anyone might have?

kevhead75

You need to provide more information about the truck such as engine and any previous matainence. Here are explanations for P030X and P0171. COuld be a COP, plug, injector or any number of other things.


P030X
NOTE: x represents cylinder number 1 through 9.
The misfire detection monitor is designed to monitor engine misfire and identify the specific
cylinder in which the misfire has occurred. Misfire is defined as lack of combustion in a
cylinder due to absence of spark, poor fuel metering, poor compression, or any other
cause.
Possible
Causes:
�� Ignition system
�� Fuel injectors
�� Running out of fuel
�� EVAP canister purge valve
�� Fuel pressure
�� Evaporative emission system
�� EGR system
�� Base engine
Diagnostic
Aids:
The malfunction indicator lamp (MIL) blinks once per second when a misfire severe enough
to cause catalyst damage is detected. If the MIL is on steady state due to a misfire, this
indicates the threshold for emissions was exceeded and caused the vehicle to fail an
inspection and maintenance tailpipe test.

P0171
Description: The adaptive fuel strategy continuously monitors the fuel delivery hardware. The test fails
when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1, Powertrain
Control Software Fuel Trim for more information.
Possible
Causes:
Fuel System:
�� Damaged or leaking fuel pulse damper
�� Fuel filter plugged or dirty
�� Damaged or worn fuel pump
�� Leaking fuel pump check valve
�� Leaking/contaminated fuel injectors
�� Low fuel pressure or running out of fuel
�� EVAP canister purge valve is leaking when the canister is clean
�� Fuel supply line restricted
�� Fuel rail pressure sensor bias
Air Induction System:
�� Air leaks after the mass air flow (MAF) sensor
�� Vacuum leaks
�� PCV system is leaking or the valve is stuck open
�� Improperly seated engine oil dipstick
Exhaust System:
�� Exhaust leaks in the exhaust manifold gasket or mating gaskets before or near the
HO2S
EGR System:
�� Vacuum hose disconnected on exhaust gas recirculation (EGR) system module
(ESM) applications
�� EGR valve tube/gasket leak
�� EVR solenoid vacuum leak
Secondary Air Injection:
�� Damaged secondary air injection system or a mechanically stuck valve


Air Measurement System:
�� Damaged or contaminated MAF sensor

Mod (Ret.)

It's as easy as opening Google.com, typing in the code, and reading. You'll get plenty of information to read, and the good sites (as perhaps the second post provided) even give you item(s) that are suspect.