PO441 and misfire on accelerating

[G35Coupe]

My daughter drives our 1998 VE with 160k miles on it. Recently she has had a problem when accelerating. The check engine light flashes while the motor misfires and the car really struggles to pick up speed - like a bad misfire - but once she gets up to about 50mph it runs fine, even when accelerating, and the check engine light stays on. I can sometimes stop the misfire by backing off slightly on the throttle for a second. This only seems to be an issue once the engine is at normal operating temperature.

I know the code points to an EVAP fault but was hoping the other symptom might help someone to help me find the exact fault quickly.

[daniel2002p]

sound like bad plugs or wires... take the plugs out and inspect them as well as see if they are sparking....

D

[Bitter]

on another corolla forum he posed the same question, his code is for the evap system and his daughter admitted topping off the fuel tank which led me to believe a fuel logged charcoal canister, however he probed his purge valve solenoid and got zero ohms resistance.

i dont know alot about the 8th gen evap systems other they they were notoriously fickle.

[bonnie*]

P0441 Evaporative Emission Control System Incorrect Purge Flow

First check spark plugs and spark plug wires. If found O, then check EVAP System Components.

EVAP System
DTC Codes : P0440 THRU’ P0455

EVAP (Evaporative Emission Control System) is fully closed system which maintains stable fuel pressure in the system for proper functioning of fuel injectors and engine. properly. It prevents fuel vapors created in gas tank to escape to the atmosphere.

Cars manufactured after 1995, normally uses ECM controlled EVAP System. The major components of this system are:

1) Gas Cap with Vacuum Check Valve
2) Fuel Inlet Filler Pipe
3) Gas Tank
4) Fuel Lines
5) Charcoal Canister with vacuum & pressure check valve
6) VSV : Vacuum Switching Valve
7) P-Port : Ported VacuumPurgePort on throttle body.

Leak or clogging in EVAP system can trigger “Check Engine” Light on. ECU can generate specific code(s) depend upon nature of fault.

GENERAL EVAP SYSTEM SCHEMATIC IS AS UNDER:




You have to check particularly followings:

1) Thermo Vacuum Valve (TVV) or Vacuum Switching Valve (VSV) Solenoid
2) Charcoal Canister
3) Throttle Valve and throttle Position Sensor
4) Purge and Fuel lines.

For more information read thread:
http://www.toyotanation.com/forum/t171748.html

[bonnie*]

Hint :
Today We Solved Same Dtc Code P0441 In Different Make Vehicle In Which Vsv Was Stuck Closed.