This could be something as simple as a broken vacuum line. What were the codes that were retrieved from the system? Let me know and I will help you rack this down.
Now one thing you can look at is the charcoal(or evap)canister. If the vehicle tends to get "topped off", what commonly happens is fuel overflows and makes it way into the canister and then breaks up the charcoal filtering element. When the system goes to purge the system during cruise, the system tends to **** up the charcoal particles and plug the system. Once this happens, the system will ususally come up with a purge solenoid circuit malfunction. Remove the canister and shake it. If it sounds like sand, it's junk. Now I can only professionally advise you to replace the canister. I don't own the car though. Let me know on this and we will move forward. If you can remember he numer of the codes, that will help a bunch. If you can't, don't worry. We will figure it out.
What did it turn out to be?
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Hi!
Check:
vacuum hoses for cracks loose or disconnected,
smog canister,
clogged PVC valve,
Intake gasket leak,
Head gasket leak.
If the Check Engine light is ON, have the codes read. What are the symptoms? Motor size?
keep me posted!!
P0440 Evaporative emission (EVAP) system - malfunction
Possible causes: Hose connection(s), intake leak, EVAP canister purge valve
P0441 Evaporative emission (EVAP) system - incorrect flow detected
Possible causes: Hose connection(s), intake leak, EVAP canister purge valve
P0442 Evaporative emission (EVAP) system - small leak detected
Possible causes: Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
P0443 Evaporative emission (EVAP) canister purge valve - circuit malfunction
Possible causes: Wiring, EVAP canister purge valve, ECM
P0444 Evaporative emission (EVAP) canister purge valve -open circuit
Possible causes: Wiring open circuit, EVAP canister purge valve, ECM
P0445 Evaporative emission (EVAP) canister purge valve -short circuit
Possible causes: Wiring short circuit, EVAP canister purge valve, ECM
P0450 Evaporative emission (EVAP) pressure sensor - circuit malfunction
Possible causes: Wiring, EVAP pressure sensor, ECM
P0455 Evaporative emission (EVAP) system - large leak detected
Possible causes: Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
P0456 Evaporative emission system - very small leak detected
Possible causes: Mechanical fault, hose connection(s), EVAP pressure "sensor
P0457 Evaporative emission system - leak detected (fuel cap loose/off)
Possible causes: Mechanical fault, hose connection(s), EVAP pressure sensor
P0458 Evaporative emission system, purge control valve -circuit low
Possible causes: Wiring short to earth, EVAP valve
P0459 Evaporative emission system, purge control valve -circuit high
Possible causes: Wiring short to positive, EVAP valve
Evaporative Emission Purge Solenoid
Description & Operation
The duty cycle EVAP canister purge solenoid (DCP) regulates the rate of vapor flow from the EVAP canister to the intake manifold. The Powertrain Control Module (PCM) operates the solenoid.
During the cold start warm-up period and the hot start time delay, the PCM does not energize the solenoid. When de-energized, no vapors are purged. The PCM de-energizes the solenoid during open loop operation.
The engine enters closed loop operation after it reaches a specified temperature and the time delay ends. During closed loop operation, the PCM cycles (energizes and de-energizes) the solenoid 5 or 10 times per second, depending upon operating conditions. The PCM varies the vapor flow rate by changing solenoid pulse width. Pulse width is the amount of time that the solenoid is energized. The PCM adjusts solenoid pulse width based on engine operating condition.
Removal & Installation
The duty cycle evaporative (EVAP) canister purge solenoid is located in the engine compartment near the brake master cylinder.
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It's a 4.3 v6. Had code read and it said either gas cap, canister or cracked hose. Didn't find any
No idle problems. Runs fine
Got fixed, thanks
It turned out to be the canister. Haven't gone any further. Maybe at the end of the month when on vacation
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