I have a 2001 Jetta TDI 5spd with 146K miles. I have been slowly loosing poser over the last 2 years. I cleaned the injectors, intercooler and intake (was about 50% restricted). I then disconnected the MAF (original 461 which had not changed in the recall by the previous owner). It had a dramatic increase in power, so I ordered what I thought was the ...461C. It was actually a ...461A. It ran great for a week and then had a sudden failure. The car went into limp mode. I pulled over and disconnected putting the car into the default mode. When I reconnected, it ran the same as the old bad 461. I got my money back and installed a new Bosch 0281002757/038906461C from MJM Autohaus. It was underpowered just like the original with the exception of when I get the revs up to 3,000 rpm, it kicks into the default mode. Everytime I turn the car off. I have to get back to 3,000 rpms to kick in the default settings.
I have cleaned the MAF connection, both ends of the cable and the ECU connection and chassis ground. I get battery voltage (12.5V) on pin#2, 20 ohms on #3 pin and 5V on Pin #4 on the MAF connector.
I get an open circuit between all of the MAF pins (2 to 3 & 4 and 3 to 4), Seems like there should be some ohm reading when checking the others the #3 ground pin.
Bottom line. I notified MJM Autohaus and they suggested that I take my car to a VW dealer to have it checked. This would probably cost more than the $90 for another 461C. The VAG-COM printout show2 90 mg/str at Idle when 260 mg/str is specified. After the default kicks in, It is a continuous 550 mg/str reguardless of rpm. Also the check engine light does not come on with the MAF connected. Shouldn't this be enough to convence MJM to exchange my MAF for another. What should the resistance reading be between MAF pins, so MJM can test if need be?
I have cleaned the MAF connection, both ends of the cable and the ECU connection and chassis ground. I get battery voltage (12.5V) on pin#2, 20 ohms on #3 pin and 5V on Pin #4 on the MAF connector.
I get an open circuit between all of the MAF pins (2 to 3 & 4 and 3 to 4), Seems like there should be some ohm reading when checking the others the #3 ground pin.
Bottom line. I notified MJM Autohaus and they suggested that I take my car to a VW dealer to have it checked. This would probably cost more than the $90 for another 461C. The VAG-COM printout show2 90 mg/str at Idle when 260 mg/str is specified. After the default kicks in, It is a continuous 550 mg/str reguardless of rpm. Also the check engine light does not come on with the MAF connected. Shouldn't this be enough to convence MJM to exchange my MAF for another. What should the resistance reading be between MAF pins, so MJM can test if need be?