Question about Chevrolet S 10

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I have a 2003 S-10 crew cab with the V-6 vortec engine my service engine light came on showing a po442 fuel system vacuum leak and then when i went to fuel up fuel is backing up so i unhooked vent hose from charcoal canister and its ok to fuel so i know something down there is plugged or not working but don't want to replace everything

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  • middlebarry1 Jul 30, 2008

    thanks i guess its canister then cause i unhooked hose at canister and it was ok to fuel so hose must be ok

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This is either going to be the charcoal canister being full or plugged, or the hose being colapsed or plugged. Try a new hose first, then the canister.

Posted on Jul 29, 2008

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How to repair engine code po442 2009 mazda 5?


Check the purge solenoid under the hood common problem in mazda 5 6 cx7.

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What does PO442 and PO463 codes mean


PO442 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.A 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:
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Hi I have a 98 gmc sierra 1500 with 5.7 vortec, recently replaced gas tank and fuel pump engine light came on had obd code po442 change gas line to evap canister to high pressure fuel line light went off,...


It's hard to find these small leaks. If you have a vacuum pump, there are a few tests you can run on the components of the system. See below.


TESTING

Vapor Canister
See Figure 1

  1. Apply a length of hose to the lower tube of the purge valve assembly and attempt to blow air through it. There should be little or no air should passing into the canister.

If the canister is equipped with a constant purge hole, a small amount of air will pass into the canister.
  1. Using a hand-held vacuum pump, apply a vacuum of 15 in. Hg (51 kPa) to the control vacuum (upper) tube. If the vacuum does not hold for at least 20 seconds, the diaphragm is leaking. Replace the canister.
  2. If the diaphragm holds vacuum, attempt to blow air through the hose connected to the PCV tube while vacuum is still being applied. An increase of air should be observed. If no increase is noted, the canister must be replaced.
jturcotte_228.gif

Fig. Fig. 1: Cross-section of the vapor canister


Fuel Tank Pressure Control Valve

  1. Attach a length of hose to the tank side of the valve assembly and try to blow air through it. Little or no air should pass into the canister.
  2. Using a hand-held vacuum pump, apply vacuum equivalent to 15 in. Hg (51 kPa) to the control vacuum tube. If the diaphragm does not hold vacuum, the diaphragm is leaking. Replace the valve.
  3. If the diaphragm holds vacuum, attempt to blow air through the hose connected to the valve while vacuum is still being applied. Air should pass. If no air is noted, the valve must be replaced.

Thermostatic Vacuum Switch
  1. With engine temperature below 100°F (38°C), apply vacuum to the manifold side of the switch. The switch should hold vacuum.
  2. Start and continue to run the engine until the engine temperature increases above 122°F (50°C). The vacuum should drop off.
  3. Replace the switch if it fails either test.

purge valve location:

jturcotte_229.gif


EVAP vacuum switch pic:

jturcotte_230.gif

EVAP system diagram:
jturcotte_231.gif

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1 Answer

Engine coad po442 how do i fix it


PO442 is the data trouble code for (evaporative emission control system leak detected "small leak") it means that the OBD-II system has detected a small vacuum leak in the evaporative control system.

You will need to find the vacuum leak in the evaporative control system, check for cracked or broken vacuum lines and hoses, especially the vacuum hoses and lines around the evaporative (Evap) canister and the (Evap) solenoid. Also check the gas cap seal for damage.

Vacuum hoses and lines should be checked very well for any cracks or breaks, because they usually hide under the vacuum line or hose.

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I am getting codes Po449 and P0455 on my 2004 GMC Sierra 1500. I put a new fuel cap and then had the computer reset. The engine light went away but came back later that day. What do you suggest I do nest?


This indicates a fuel vapor leak or lack of purge flow in the EVAP control system. It means a large leak has been detected. 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.

Assuming you put on the proper gas cap and one of high quality, I would inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary.

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1 Answer

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P0141 & P0161 are oxygen sensor codes, P0442 is fuel evaporative leak. P0141 & P0161 I would replace the o2 sensors, P0442, make sure the gas cap is on tight, if it is, take it off and look at the rubber seal on the cap where it seals on the filler neck. Sometimes that seal get hard/brittle and cracks. This would allow a vacuum leak in the fuel evap system. If you find cracks in the fuel cap seal just install a new gas cap. Now any time you replace parts from having the check engine light on, doesn't automaticly turn the light off. You need a scan tool for that, however, I you fixed a problen by replacing parts, the next time the computer runs its "on board" diag test & that system passes, the light will turn off. You can alway go to you local parts wherehouse or Aamco & they will scan for free.

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2 Answers

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You likely won't notice any drivability problems. P0442 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.

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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