I have a 96 passat. The end of my clear-tube-returned line is connected to a T. The T directed the fuel to the fuel filter and to a sensor(?) near the rear of the airbox. The line from the sensor connect to the exhaust pipe. What is that sensor? Is is just a thing to help heat the fuel? Thanks for any info.
96 Passat returned fuel question
- Thread starter TDI001
- Start date
jck66
Top Post Dawg
Is this the infamous 96 Passat extra fuel injector into the exhaust line maybe?
Lug_Nut
TDIClub Enthusiast, Pre-Forum Veteran Member
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- Jun 20, 1998
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- Sterling, Massachusetts. USA
- TDI
- idi: 1988 Bolens DGT1700H, the other oil burner: 1967 Saab Sonett II two stroke
The "sensor" is a solenoid operated pump that squirts fuel into the catalytic converter. Why? Some theoretical calculation showed that the cat could cool down and become less effective. The raw fuel in the cat would burn and raise the cat's temperature back up to an effective level.
In practice the fuel was squirted into the cat at too low a temperature to burn. The raw fuel could create large black clouds under certain conditions. Talk about embarrasing! The intent was to reduce emissions, the result was an unbelievable increase in emissions.
The cat injector was left off the 1997 Passat. There is a VW service program (not a recall) to delete the operation of the injector from the 1996. Your's may have been done already.
There is also a low cost, at home, means of defeating the injector if the service work hasn't been done to yours yet.
Use the search feature located under the ad for the plate frame at the top of this page. Use "fifth injector" as the search phrase to get so much more information than you'd ever want.
In practice the fuel was squirted into the cat at too low a temperature to burn. The raw fuel could create large black clouds under certain conditions. Talk about embarrasing! The intent was to reduce emissions, the result was an unbelievable increase in emissions.
The cat injector was left off the 1997 Passat. There is a VW service program (not a recall) to delete the operation of the injector from the 1996. Your's may have been done already.
There is also a low cost, at home, means of defeating the injector if the service work hasn't been done to yours yet.
Use the search feature located under the ad for the plate frame at the top of this page. Use "fifth injector" as the search phrase to get so much more information than you'd ever want.
