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I have 160K on my car Check engine light is on for last 3-4 months took it to pepboys for code check it was evap leak issue. For couple of weeks now Its giving me trouble when starting. My friends checked batteryrelay in the box cabels etc they looks good He went under and knocked the Black Canister? Then It started? I Talked to some one he thinks it could be distributer cap (has moisture is it preventing start) Should I change the distributer cap or Fuel Filter or Fuel pump? Thanks

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How old is the truck? On electronic ignitions these days, water seldom gets in dist. but there is a spray you can get to dry up water, just take dist. cap off and spray then wait a few minutes before replacing cap.

Posted on Sep 02, 2010

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2001 Toyota Prius with 155,000 miles. The engine battery on this had been replaced in late 2010 under warranty. The car has been suddenly losing power almost everyday for a week, with the triangle warning...


code p0441 refers to evaporative emission EVAP system-incorrect flow detected===causes hose connections--intake leak---EVAP canister purge valve
Po144 refers to the same fault and causes
Po446 refers to EVAP system--vent control-circuit malfunction===causes --wiring---EVAP canister purge valve---ECM In all cases codes the canister purge valve gets a mention and then the ECM. I would take it back and ask that the canister purge valve be changed or even ask for a new canister as there are occasions when filling the tank to the filler hole will induce fuel into the canister causing it to malfunction.

Aug 03, 2013 | 2001 Toyota Prius

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Getting a smoke test is the right direction to go in.
The computer vents the gas tank to the vapor canister while the engine is running. It also pressure tests the system for leaks. Some where between the gas tank and the vapor canister there may be a leaking hose or valve. Or it could be the gasket on top of the tank where the pump assembly went in.
The gas cap could have been a source for the leak, the other things are not involved.

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2003 Jeep Liberty


p0455 is evap control system no purge or large leak
p0442 is evap control system leak detected (small leak)

the cause for both could actually be a loose gas cap.

Dec 18, 2009 | 2002 Jeep Grand Cherokee

1 Answer

Jetta 2.0 2000


16826/P0442/001090 - EVAP Emission Control Sys: Small Leak Possible Symptoms
  • Malfunction Indicator Light (MIL) active
Possible Causes
  • Evaporative Emission (EVAP) System leaking
Possible Solutions
  • Check Evaporative Emission (EVAP) System Sealing
    • Check Fuel Cap

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you were told your vehicle has small/large evap leak detected? The leak could be coming from any number of components. Fuel tank seal, evap purge valve, check valve. The best way is to find the leak with a smoke machine. It is designed to find leaks in the evap system. There is a port with a green cap in the engine compartment. This is where the hose from the machine attaches to. Turn machine on. Where ever you see smoke, this is where the leak is.

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I have the same failure that occurred when smogging my Ford Ranger. The EVAP test was just added a couple of years ago and it tests for leaks in the gas tank vapor recovery system. What this is a system of vapor recovery lines that connect from the gas tank and goes to a canister then returns to the intake and on the next engine start and gets used, instead of leaking into the air.

The only issue is these lines can develop a leak at any of the connection points or along the rubber portions and can be a pain to replace depending on your application. So until you fix the leak you will fail this test since they pressurize the system and if there is a leak it won't hold the pressure.

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You may not have a leak, the problem may be with the sensor on the fuel tank that tells the Power Train Control module if the system holds vacuum, like all sensors these will and do fail on occassion, if you ran a leak down test and the system held vacuum within the manufacturers specs then the sensor may very well be the problem that is turning on the check engine light.

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