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Old 11-07-2005, 09:06 AM   #1
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Default P0171, P0442 EMISSIONS

FAILED EMISSIONS WISCONSIN PRINT OUT HAS CODES OF P0171 SYSTEM TOO LEAN AND P0442 EVAP CONTROL SYSTEM LEAK DETECTED (SMALL LEAK) P0446 EVAP CONTROL SYSTEM VENT CONTROL CIRCUIT . FATHER IN LAW TELLS ME IT IS A VACUM LEAK . I COULD NOT HEAR ANY REALLY LOUD OR HISSING OF ANY KIND
LOOK AT HOSES THE BEST I COULD BUT DID NOT SEE ANY CRACKED OR OFF ANY SUGGESTION
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Old 11-07-2005, 09:15 AM   #2
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First suggested action on the Evap leak is to remove and reinstall the gas cap.

This may clear the remainder as well.

Being in WI I think your emission stations have the ability to test the gas cap independently. If it fails again, ask them to do it seperately.
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Old 11-07-2005, 09:56 AM   #3
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YES THEY DO CHECK PRESSURIZATION OF GAS CAP INDEPENTLY. HAVING THIS PROBLEM FOR A WHILE CHECK ENGINE LIGHT CAME ON AND ENGINE RUNS A LITTLE ROUGH WHEN IDELING , DRIVING DIFFERENT STORY LIKE NOTHING IS WRONG
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Old 11-07-2005, 10:05 AM   #4
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If the gas cap doesn't fix it, start by check each of the little EVAP vacuum lines. Specifically the short rubber connectors. Those have a tendency to crack with age. You very likely won't hear any vacuum leak, but trace each line and check the connections a both ends.

I just had to replace all the rubber fittings on my '97. I didn't hear any vacuum leak either, but three of the connectors were cracked and/or split. The others were all pretty bad. So much so that many of them just came off in pieces. All except the tees or ells can be replaced with short pieces of vacuum tubing. About $3 worth.

This is the next diagnosis step if the gas cap doesn't fix it. Let us know what you find.
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Old 11-07-2005, 12:11 PM   #5
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Also, check the vacuum connection under the snout of the super charger. I haven't had a problem with mine, but have read in other threads here that they are a common problem. It'* a bit hard to see, but it'* under there.
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Old 11-07-2005, 02:44 PM   #6
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I had the same problem not long ago.
Yes, that was a small rubber tube.
Do a search using my ID or "P1071" you will find my post.
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Old 11-08-2005, 10:14 PM   #7
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turn your caps lock off brian, thank you.
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Old 11-15-2005, 09:51 AM   #8
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I've been reading different places/sources that leaks in the EVAP system are one of the most common SES codes kicked out in cars and causes of cars failing to pass State inspections,......most vacuum leaks are too small to detect by just looking and listening for them,........you'll probably have to put the car through a garage/dealership smoke(usually using ultraviolet-activated fluorescent dye) injection/vacuum test machine(all major garages have them),they have VERY sensitive vacuum leak-down test capabilities and test/check all the hoses,fittings,tees,elbows,purge valves,etc for any tiny leaks.I've also heard of people who have had repair/maintenace work done on the car where a mechanic has 'pushed' EVAP hoses/connectors to one side or the other and have cracked brittle hoses and tees,to where they leak......
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