Question about 2000 Chevrolet Blazer

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Evap system vapor pressure I keep getting this when the check engine light comes on does any body have any suggetion? 2000 Chevy Blazer 4.3L vortec 4x4

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  • Kosta Jun 08, 2010

    I replaced the gas cap and it seem's to have solved the problem THANKS

  • Kosta Jun 09, 2010

    Ok it worked for a while but it came back

    P0446 evaporative emission system vent control circuit does any body have any Idea?? what I should be looking at next? Thanks



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Start with the simple and replace the gas cap, and see if the check engine light goes out after a day or so. Post me back the DTC codes just to make sure it's not the EVAP purge valve on the intake manifold by the ignition coil.
Thank you for using fixya and good luck

Posted on Jun 03, 2010

Testimonial: "I replaced the gas cap and it seem's to have worked"

  • Harvey N Tawatao
    Harvey N Tawatao Jun 09, 2010

    Is the GAS Cap OEM???? If not the new gas cap may not be compatible with your Blazer, after market gas cap are made for a wide variety of cars. It may fit on the gas filler neck, but might not provide the right seal to hold enough vacuum for a fuel injected system. You can get the gas cap tested also before you go off and buying a new one, if the gas cap is good. Then you have a leak somewhere in your EVAP vacuum line and that's going to be the hard to locate.

    Keep me posted and good luck, try pulling the ECM fuse from the fuse box for 1 min with the power on the ignition "engine not running". Once fuse placed back in, start the engine, this will reset your ECM and clear any old codes you have. The engine may stall at first, but let it. Just start it up again and don't touch anything, the ECM is relearning all the sensor throughout the blazer and after 3 min of idling. Go for a test drive and any MIL light that comes on will be fresh for you to address.

    Thank you once again for using fixya and be glad to help you address the issue your blazer is having.

  • Harvey N Tawatao
    Harvey N Tawatao Jun 09, 2010

    If the codes comes back than the evap vent solenoid needs to be replaced. The vent solenoid is mounted under the spare on the frame and connects to the charcoal canister. The GM part number is listed as PN 214633 referred to as the Vapor Canister Purge Valve or vent solenoid.

    Change the solenoid yourself. If you can get up to the vent valve, the only real tools that are required to replace it are a screw driver and a pair of slip joint pliers. If you cannot see the bolts that holds the valve to the mounting bracket, I think it is a 10mm bolt that holds the bracket to the frame.

    Then disconnect the electrical connection and use the slip joint pliers to move the hose clamp. From there, just twist the vacuum line until it comes off which is a good time for you to inspect the lines for any signs of damage.

    Good luck and you may want to try to clean the valve first to save you some money, most of the time it's dirt that keeps the valve form working 100% which will cause your P0446 code to show up.


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Another suggestion is to inspect the vacuum lines around the evap cannister for cracks or holes - this will also lead to erronous codes.
Also check the vacuum lines on the engine, but I believe that the vacuum lines around the cannister itself are bad or you have constantly overfilled the tank and excessive gas has gotten into the cannister and ruined it. Do not overfill vehicles or top up the tank to the top of the filler tube - if you have been doing this, replace the cannister.
Besides the answer above, this should alleviate your problems.

Posted on Jun 13, 2010

  • Bobby Poirier
    Bobby Poirier Jun 15, 2010

    System Vent Control indicates to me the Purge circuit, so check the vacuum lines for cracks running to it prior to replacing.  Check the Purge wiring and connector, or the wiring around the ECM (computer) leading to this, or just any bad wiring around the computer where the harness may have movement and scuffed against the metal body or corroded, or touched on a manifold...  

    I suspect mostly that it is as I described above in my previous post about the Cannister hoses being weak, cracked, and check the wiring around this as well.  I firmly believe that that circuit is not getting enough voltage because the vacuum is weak going to it.
    Did you check these yet? 


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Could the 3x5 unit on the crossmember above my spare tire be bad? It has a vac. hose comming to it and a Red elec. plug attached to it? What is it called?

Posted on Dec 01, 2011

  • Troy W Dec 01, 2011

    When I clear problem code why does it come back on in 3 days and not right away?


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Ware is the return air filter in a 2000 chevy blazer

Posted on Aug 29, 2011

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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1 Answer

Check engine light on for 2005 chevy impala code 450

Code 450 is for a problem with the pressure sensor for the EVAP system. The computer vents the gas tank to the vapor canister while the engine is running, and checks pressure in the system before and after venting.
The sensor and circuit would need to be checked.

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Dtc p1457,0107

P1457 HONDA - Evaporative Emissions Control System Leakage EVAP Canister Systemxicon.jpg CodePossible causes- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap There is a Honda factory service bulletin with information on how to diagnose the P1456 on the following Honda models:
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1999 Honda Accord
2000 Honda Accord
1998-2000 Honda Accord
symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vaporsP1457 HONDA Description The evaporative emission (EVAP) control system stores fuel vapor from the fuel tank in the EVAP canister temporarily to prevent it from escaping to the atmosphere and to enable it to be drawn into the engine by intake manifold vacuum and burned. In addition, the onboard refueling vapor recovery system (ORVR) stores fuel vapor generated when refueling in the EVAP canister.

The EVAP control system leak detection method improves the accuracy and frequency of the detection by determining faulty components and vapor leakage for each part. The EVAP control system (from the purge valve to the fuel tank) is divided into two parts. One is the "EVAP Canister Side" (from the EVAP two way valve to the purge valve) and the other is the "Tank Side" (from the EVAP two way valve to the fuel tank). There is 0.04 inch leak detection and 0.02 inch leak detection. If the 0.04 inch leak detection results are OK, the 0.02 inch leak detection runs. The P1457 code is detected when the EVAP system has a very small leak.

P0107 HONDA - Manifold Absolute Pressure Sensor Circuit Low Voltagexicon.jpg CodePossible causes- Manifold Absolute Pressure harness is open or shorted
- Manifold Absolute Pressure sensor poor electrical circuit connector
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- Engine rough idle
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P0107 HONDA Description The Manifold Absolute Pressure sensor provides instantaneous manifold pressure information to the engine's Engine Control Module. The data is used to calculate air density and determine the engine's air mass flow rate, which in turn determines the required fuel metering for optimum combustion. A fuel-injected engine may alternately use a Mass Air Flow sensor to detect the intake airflow. A typical configuration employs one or the other, but seldom both.

In some vehicles the absolute pressure sensor is built into ECM. HONDA Technical Service Bulletins for P0107 code1999 HONDA ODYSSEY Electrical System 2000 HONDA ODYSSEY Electrical System1998 HONDA ACCORD Electrical System 1999 HONDA ACCORD Electrical System 2000 HONDA ACCORD Electrical System 2001 HONDA ACCORD Electrical System 2002 HONDA ACCORD Electrical System 1996 HONDA CIVIC Electrical System 1997 HONDA CIVIC Electrical System 1998 HONDA CIVIC Electrical System

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EVAP evaporative emissions systems monitoring
This system includes the on-board refueling vapor recovery (OVRV) system with leak detection (LDP) pump.

The ORVR system filters fuel vapor through the EVAP canister to prevent vapor escaping directly into the atmosphere.

The engine Control Module (ECM) determines when appropriate conditions are met and activates the LDP to pump a small amount of air pressure into the fuel tank and lines. The pump runs until a pre-determined pressure or time is reached. If the system does not hold the pressure, a fault or DTC is stored in the ECM.

The area this is located is behind the right plastic rear wheel liner cover. You will see the fuel filler neck from there and the rest of the EVAP system. Visual check for cracks on all the hoses specially the hose clamps. There are 3 lines connected to the Activated charcoal canister (EVAP canister fastened to body) that are detachable and use O-rings for secured sealing. Check if O-rings, if damaged, replace.

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3 Answers

I have 2000 chevy impala 3.4 engine i have check engine light with this code p0442 took it it to auto zone they said it was a small leak dont know where to start

This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
code P0442 most likely means one or more of the following has happened:
  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal
With a P0442, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, or
  • Inspect the EVAP system for cuts/holes in tubes/hoses

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3 Answers

My GMC pickup will only start with starting fluid. After it starts, the engine runs fine. It seems like the carb is getting no gas until the starting fluid starts the engine.

Check your fuel pressure at the shredder valve, there should be 60 to 65 psi when the fuel system is primed. "engine not running" once the engine is started the fuel pressure should drop around 5 psi, any other readings will give you a no start or no run. Your fuel filter may be close to the end of it's life or the fuel pump may not be pushing enough pressure when the battery is under load and under 12 volts, once the engine start's the voltage rises to 13.5 volts giving the fuel pump that extra to keep the fuel pressure up. The other common problem to your Vortec engine is the fuel system. The fuel pressure regulator is know to go bad on the Spider system, which also would give you the no start problem. Start simple with replacing the fuel filter and check the fuel pressure at the shredder valve and then go from there. Keep me posted, be glad to help you get your truck running 100% again. 

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2000 cavalier check engine light code po440

P0440 - Evaporative Emission (EVAP) System

evaporative emission (EVAP) system has a large leak.
Check the gas cap or vent valve. these are the most common problems.

The Powertrain Control Module (PCM) at different times performs various tests on the EVAP system. OBD II Enhanced EVAP systems are in place to keep fuel tank vapors from venting into the atmosphere, and instead purges them into the engine to be burned. Regular pressure tests are conducted by the PCM to monitor the sealed system for leaks. The PCM monitors the EVAP system pressure by watching the Fuel tank pressure sensor (FTP). When the sensor indicates a small leak in the EVAP system, this code is set.

Here are some additional causes.

* A small leak in any of the EVAP hoses or fuel tank hoses
* A small leak in the purge valve or vent valve
* The EVAP Canister may be leaking

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1 Answer

1999 chevy blazer wont start


if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

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1 Answer

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1) Is the service engine soon light ever on when engine is running?
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Let me know.

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