The DPR as it names says controlls the difference in preasure from the upper and lower chambers, its controlled by the o2 sensor and the mass air flow (located at the side of the airbox - opposite side from the DPR) If you unplug the DPR the computer gets into a limp-home state which lets the car run but really badly, missfireing, really low power, etc. The DPR´s do go bad.
I would suggest you check the terminal of the DRP that goes into the Jetronic ECU, mine made a false contact making it run terribly bad. Try Disconnecting the O2 sensor as some of other listers have suggested. If none of this work, check the wiring with a multimeter for continuity. good luck Francesco. ---------------------------------------------------------- DIFUNDE NUESTRA PAGINA WEB http://www.geocities.com/fontaracing ----- Original Message ----- From: [email protected] To: [email protected] Sent: Sunday, August 19, 2001 3:34 PM Subject: Re: Running problems again: More info In a message dated 8/18/01 9:19:01 PM US Eastern Standard Time, [email protected] writes: So if I totally disconnect the DRP, the car runs fine w/o bucking. If the DPR is bad, why did it run OK after they had it at the dealership? What exactly does the DPR do, and why does it run fine without it hooked up? The DPR is controlled by the o2 sensor, and it riches/leans the mixture based on readings from the o2 sensor. Plug the DPR back in, and disconnect the o2 sensor. Let us know what happens. -Dave '91 Jetta GTX 16V '88 Jetta GLI 16V '84 Vanagon
