07 Jetta 2.5l, random misfire as well P0301-05
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Joined: Oct 2009
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07 Jetta 2.5l, random misfire as well P0301-05
07 vw jetta 2.5ltr sedan, auto
intially it started with misfire on bank 5 cylinder, than 4 & 1. so i replaced the spark plugs from vw, after that car was running fine ... no check engine light ... and after a little while like next day ... its running more horrible now ... error codes random misfires and p0301 to p0305 ... its giving me codes for all 5 cylinders now, i checked air filter seems fine, no visible vaccume leaks or crack, car is still driveable right now, its mis idling at this moment but as soon i accelrate to 1500 rpms car feels smoother ... i did pour fuel injector cleaner didnt make much difference ... what should i do to resolve this issue ... thanks in advance ...
intially it started with misfire on bank 5 cylinder, than 4 & 1. so i replaced the spark plugs from vw, after that car was running fine ... no check engine light ... and after a little while like next day ... its running more horrible now ... error codes random misfires and p0301 to p0305 ... its giving me codes for all 5 cylinders now, i checked air filter seems fine, no visible vaccume leaks or crack, car is still driveable right now, its mis idling at this moment but as soon i accelrate to 1500 rpms car feels smoother ... i did pour fuel injector cleaner didnt make much difference ... what should i do to resolve this issue ... thanks in advance ...
Super Moderator
Joined: Sep 2009
Posts: 2,648
From: Stoke on Trent, England
Welcome to the forum. 
Its the same solution for the other cylinders.
https://volkswagenforum.com/forum/ne...gnature-34185/
Its the same solution for the other cylinders.
VAG Error Code: 16685/000769
EOBD II Error Code: P0301
Fault Location:
Cylinder 1 - Misfire Detected - Intermittent
Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Lack/loss of power.
Hard start.
Engine hesitation.
Wiring/Connector(s).
Ignition system.
Fuel injectors.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression.
Base engine problems.
Engine Control Module (ECM) damaged.
Special Notes:
This feature search for engine misfire in a specific cylinder. Most of the time the cause for a misfire is a lack of combustion in a cylinder due to absence of spark, poor fuel metering, or poor compression.
Tech Notes:
The P0301 code means that the cylinder 1 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 1. If the problem persist more tests needs to be done to diagnose problem.
When is the code detected?:
Engine Cylinder 1 is misfiring.
Description:
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.
As taken from my https://volkswagenforum.com/forum/ge...oftware-34973/
EOBD II Error Code: P0301
Fault Location:
Cylinder 1 - Misfire Detected - Intermittent
Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Lack/loss of power.
Hard start.
Engine hesitation.
Wiring/Connector(s).
Ignition system.
Fuel injectors.
Fuel pressure.
Running out of fuel.
EVAP canister purge valve.
Evaporative emission system.
Low compression.
Base engine problems.
Engine Control Module (ECM) damaged.
Special Notes:
This feature search for engine misfire in a specific cylinder. Most of the time the cause for a misfire is a lack of combustion in a cylinder due to absence of spark, poor fuel metering, or poor compression.
Tech Notes:
The P0301 code means that the cylinder 1 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 1. If the problem persist more tests needs to be done to diagnose problem.
When is the code detected?:
Engine Cylinder 1 is misfiring.
Description:
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.
As taken from my https://volkswagenforum.com/forum/ge...oftware-34973/
https://volkswagenforum.com/forum/ne...gnature-34185/
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