Question about 1999 Buick Regal

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My 1999 buick regal wont pass echeck. it says evap system leak (small). i had the filler neck fixed and then had my system smoked and my mechanic found no leak but the service engine light remains on. ive drivin it sparingly since because my plates are expired. anyone know why my engine light wont go off????

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There is a leak somewhere all it takes is a pin whole to set it off had audis that did that sounds like a pain but you will have to check every line or replace them all

Posted on Oct 11, 2010

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Have replaced 2 solenoids near engine, is there a 3rd underneath car?


There is a vent solenoid under the vehicle near the gas tank on the evaporator canister or charcoal canister An your replaced one near the engine you didn't need to. Only 1 on or near engine ( purge solenoid ) But there is also the possability the gas cap leaks , the fuel filler neck is rusted somewhere , or one of the hoses as a pin hole . You could replace all the solenoids an still have the code come back. The best way to trouble shoot these type problems is hook up a smoke machine an smoke the system . Your best bet would be to take your vehicle to a qualified repair shop. I mean unless you like spending money needlessly .
DTC P0442 Evaporative Emission (EVAP) System Small Leak Detected.To aid in locating intermittent leaks, use the J 41413 EVAP Pressure and Purge Station to pressurize the EVAP system. Move all EVAP components while testing with the J 41416 Ultrasonic Leak Detector.

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You should have an EVAP leak test done . It could be a leaking purge valve , you could need a new gas cap as well or it could be the fuel filler neck . or assorted hoses or the fuel tank pressure sensor . If the check engine light is lit there will be a code .
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most of the time a small evap leak may be due to a bad gas cap but other times it could be a line or rusted filler neck or other problems. the best way to find such a leak would be with an evap smoke machine, thee machine pumps smoke into fuel tank and lines for evap system and with vent valve shut the system should be air tight, then you look for smoke and where smoke is that is your leak, most repair shops have the machine, note : some leaks are so small the smoke can not be seen ,at this point soap water in a spray bottle is helpful, spray lines and other areas to see bubbles.

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If you have access to a 'smoke test machine' this will enable you to detect and locate the leak. If UV sensitive dye is also in the oil that creates the smoke for the smoke test, you can trace it with the UV light that comes with the machine.

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1 Answer

I recently purchased this 1999 Chevy Blazer and it wont pass inspection because the OBD2 Diagnostic trouble code states it's problem is, code P0440-Evaporative Emission System. The guy said it looks like...


The evaporative leak detection diagnostic strategy is based on applying a vacuum to the EVAP system and monitoring the vacuum decay rate. The VCM monitors the vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid turn ON, allowing the engine vacuum to draw a small vacuum on the entire evaporative emission system. If a sufficient vacuum level cannot be achieved, a large leak or an EVAP system malfunction is indicated.

The following conditions can cause this problem:
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* A disconnected or malfunctioning EVAP purge solenoid
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* An open ignition feed circuit to the EVAP vent or purge solenoid
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1 Answer

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