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Evap System shut-off valve code P0442 S90-V90 1998

Well... I have traced the small leak (code P0442) to the Purge Valve by testing the valve with a vacuum pump.
After that I had a re-occurring code P0455 (Evap System Gross Vacuum Leak).
I used a vacuum pump and traced the problem to the back of the car, on top of the fuel tank.
I had to flip over the back seat, remove the 3 nuts that hold the floor panel down and flipped it over.
Under the panel on the driver side is a 10" x 8" access plate, which is secured by four bolts. By removing them you get access to the top of the fuel tank, so if you ever need to replace your fuel pump that is the way to do it.
After removing the access plate I run the smoke pump again and traced the smoke to a vacuum line connected to a white squareish plastic valve (probably the rollover safety valve).
The vacuum hose is slightly curved and of unequal diameter, one end is about 1/4" ID and the other end is about 3/8" ID (maybe sizes are in millimeters).
The crack was right at the curvature, and with no smoke pump would have been almost impossible to locate and fix the problem. There is no way to trace or access this from under the car.
In conclusion, if I will have to do it again it is a job that takes no more than 45 minutes (a total of seven bolts/nuts with a # 10 mm socket wrench). Easy job if you know what to do but I had no direction of how to start and Alldata does not have anything about it.

I know this is an earful but I hope this may save somebody some time, money and aggravation.
As for the code problems, so far so good. Happy motoring!

DanV90






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New Evap System shut-off valve code P0442 [S90-V90][1998]
posted by  DanV90  on Tue Mar 3 12:58 CST 2009 >


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