All Things Mk5 > How to Guides / Troubleshooting

Misfire at idle

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DDale:
Thanks everyone for the response.

I tried the PCV check by unplugging the oil cap, it's hard to take off and the engine barely runs so I assume it's a good sign.

The sparkplugs condition might be because of the DV that I installed, I am running a GFB VTA which is a vent to atmosphere DV instead of diverting it back to the intake which might be the reason why I'm running rich.

I'll come back for an update after installing the purge valve. 

DDale:
UPDATE!

I replaced the N80 Purge Valve and it fixed all the issues!
Car is now running healthy, drove it for few hours and no more Check Engine Light, misfire during idle is also gone. I also noticed a huge improvement in acceleration and overall responsiveness.

Here is the summary in case someone experienced this problem.

The problem
-CEL is on with P0441 Code - EVAP Emission Control Sys - Incorrect Flow - MIL ON.
-Clearing the CEL is a temporary "solution", it will keep coming back.

 

-Occasional Engine Misfire at idle, more common and worse the less fuel you have in the tank (more air in the tank).
-Noticeable loss of power/laziness during acceleration.

Troubleshooting done
-Checked n80 valve using VCDS basic test group 70 returns "EVAP Not OK"
-I tried swapping Ignition Coils and spark plugs to see if the misfire will move to a different cylinder(A common check to see if ignition coil/spark plug is the problem), nothing happened.
-Check for any leaks in the intake system and EVAP hoses, all OK.
-Checked PCV functionality. all OK.

Solution
-First replaced the Charcoal Canister but it did not fix my issue, it is a possible solution.
-Replacing the N80 Purge Valve solves all the issues mentioned above.

Thanks everyone for the help!

mjmallia:
 :happy2:

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