Question about 2001 Chevrolet Silverado 1500

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01 silverado check engine light

Had it tested and computer reports a vacume leak in the emission system??? any sugesstions i have not foud any thing obvious.

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Just a loose vacuum line can cause a problem. What I have done in the past is cut just the tip of each rubber vacuum line(that is if there is enough) to reassure the line has a tight fit on the fitting. I don't know if this was any help or not ?

Posted on Nov 09, 2008


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My 2006 Silverado indicates loose gas cap. I have replaced it with new gm cap. What else could it be?

The computer has detected an emission leak when it runs a self test during start up and the drive cycle. One of the most common problems is people forgetting to reinstall/tighten the fuel cap. The manufacturer introduced this light so it will be the first thing checked by the owner before spending money and heading to a shop. There are numerous reasons for this light other than the fuel cap. You may have a problem with a disconnected /leaking evap hose.. purge valve..pressure sensor... charcoal canister etc. The emission system will need to be scanned to isolate the source of the failure

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Evap system problem, 2008 silverado extended cable 5.3 Flexfuel check engine light is off, but, the scanner is showing evaporative system , no code, only yellow light, it won't pass the emissions. I a

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Evap emission system

Have same problem with my 2002 Silverado. Changed purge valve. Still no luck. There is a fitting for forcing smoke into fuel system to find leaks. I checked out a friends Trailblazer (same code) Someone stole his gas cap. Bad gas cap can also cause this code. You can ignore this code. It does not have any effect on engine performance, but if you have to pass emision test must be repaired

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Yellow emission light on left upper side of dash stays on does not flash could it be a thermostat

The information below was complied by me, it explains what causes the check engine light to come on and the process of finding the cause.

When the yellow Check Engine light (or Service Engine Soon) is turned on, the systems computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible system faults (the gas cap is just one of them) that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen/Oriley and Autozone parts stores (USA only) do this testing for free.

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01 dodge ram 1500 5.2 4WD code P0455 evap system leak.

This code will not stall or no start of your engine, evap only work when engine is off, it is to reduce the fume your gas tank lets out to protect the o zone, but it will not pass Emission test, also could be some thing a small as your gas cap not sealing right.

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Finding a leak in these emission systems is almost impossible.
All it takes is a pin hole in a hose to screw up the whole system.
The best way to find the leak is to take and have a smoke test done on it. Smoke is injected into the system and where ever the leak is , the smoke will leak out of it. It's faster and more reliable then replacing hoses and other things you don't need. Call dealers, or repair shops to see who does smoke tests.

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Po442 and po449 codes, gas cap checks ok what is next

P0442=Evaporative Emission System Leak Detected (small leak)
P0449=Evaporative Emission System Vent Valve/Solenoid Circuit
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