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How to smoke evap system on 01 blazer - 2001 Chevrolet Blazer

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  • Donnie Wilson
    Donnie Wilson May 11, 2010

    Are you getting codes to point in this direction?

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P0440 trouble code 98 chevy blazer


This code indicates a leak in the fuel vapor system know as the evap system this can be caused by several things. a faulty purge valve, a vent valve, any one of the fuel vapor lines or even a gas cap that is lose or the seal is bad on gas cap. to isolate the exact problem requires a high end scan tool and a smoke machine to find the problem. on this vehicle the two most common problems are a gas cap, or a bad vent valve

Dec 20, 2011 | 1998 Chevrolet Blazer

2 Answers

Abs light on with a p0452 code


ABS -- is one problem
Possible Wheel Speed Sensor ,but
you can't guess Use codes & other
resouces to diagnose

EVAP System Code PO452 -- may be a
Pressure Sensor issue ,all I have is Low Input
I assume that means high resistance in the solenoid coil,
thus low voltage detected
Again- need scanner & evap smoke machine ,to check out,
unless your guy shot guns common items & gets lucky at
your expense,changing parts

Aug 04, 2011 | 2000 Chevrolet Blazer

1 Answer

DTC # 01-PO442 and P1407 are the codes that come up possible solution help


PO-442 EVAP Control System Leak Detected (Small Leak)

You will need to put an EVAP Smoke Machine, on system to find leak

P1407--Should be EGR related.

Most likely need new EGR Valve

May 23, 2010 | 2001 Ford F150 Styleside SuperCrew

1 Answer

How to fix a p0442 on a chevrolet blazer


There is a small air leak in the evaperative emission control system,and they are not easy to find. Could be in anyone of the vacuum hoses.
The only sure way to find the leak is to call around and see who does smoke tests. What they do is, inject smoke into the system and where ever the leak is, the smoke will come out, otherwise you could search all day and never find it. All it takes is a pin hole in a vacuum hose to screw up the whole system.

May 18, 2010 | 2000 Chevrolet Blazer

1 Answer

Evap system where all the areas to check , to replace


I would find a garage that can perform a smoke test on the evap system. They inject smoke into the system and look for where it comes out.

Apr 28, 2010 | 2002 Chevrolet Blazer

1 Answer

I need to replace the evap hose and dont know how


This needs to be done at the dealer. They use a special tank of pressurized gas and scan tools. They also use a special fog machine that uses glycol to smoke out the leak.

Apr 07, 2010 | 2002 Chevrolet Blazer

2 Answers

I have a 2003 Trail Blazer with code 442 coming up (small leak in the EVAP system). I know of other owners with the same trouble. Replaced the gas cap without results. It seems to be a common problem, what...


  • Gas cap loose or improperly affixed
  • 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
  • Thats what your looking for....

    Jan 25, 2010 | 2003 Chevrolet Trailblazer Ext

    1 Answer

    2002 chevy cavalier p0440 and service light is on


    that is fuel tank evap related code.
    It can be caused by simply removing the gas cap while the engine is running.
    Dont get too concerned with this code if you think you may have opened the cap while car was running, the computer will soon turn the light off if all is well.
    Other things Like ta cracked or faulty gas cap, The evap purge canister or hoses loose or cracked, filler neck hoses loose or cracked ,damaged orings on evap sensor. could also cause this code.
    They often use a special smoke machine to diagnose leaks in the tank and evap system.
    The special machine fills tank with smoke at 2 psi making it posible to spot leaks.
    Hope this helps.
    If it does dont forget to leave a comment.
    (:DK

    Oct 25, 2009 | 2002 Chevrolet Blazer

    1 Answer

    2004 chrysler pacifica,i got engine light on.code p0440


    his is an Evap sytem fault code. I have seen this problem with old gas caps not sealing correctly, restricted egr and evap canisters. The dealer can smoke test the system for around 50 bucks, but usually the parts can be cleaned (egr) or replaced (vacuum line).

    May 03, 2009 | 2002 Chevrolet Blazer

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