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Old 01-09-2001, 08:57 AM
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Join Date: Nov 2000
Location: Jacksonville, FL USA
Posts: 113
Well I finally ordered a new OVP and replaced it. But now am having problems again. Is it possible that my driving for about a month with the OVP has caused problems somewhere? What happens is, when the new OVP was placed in the car the engine almost flooded itself trying to start. Well I took the OVP out and the car started right up, I let it warm up a bit and put the new OVP back in the car, the car started running real rough and just smoothed out after about 5 seconds of rough running. I took the OVP out and the engine RPM and sound did not change. When I put the OVP back in it started running rough so I took it back out, when I did the engine smoothed out. I have heard about something called Fixed operating mode or something along those lines. Could a bad O2 sensor put the car in FOM and cause the running problems stated above? Or might it be something else. I just left the OVP in the car (which made my Antilock brakes work again) and now every time I start it (when warmed up) it runs rough for about 5 seconds or less and smooths out again also now if I leave the car idling for about 10 mins or more the O2 light illuminates and goes away after a driving about 1/2 mile. Thanks for your help and sorry about the long post.

2003 Volkswagen Golf GL 24,000 miles. 1.9L I-4 TDI 5spd.

1986 300E. 115,000+ miles. 3.0L I-6 1st daily ride, around town only. (Gone)
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Old 01-09-2001, 03:29 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
When the OVP relay is bad or missing the KE control unit is unpowered. With a warm car the feedback control system (Lambda) should be set to zero current correction. This normally means the car runs about the same warm with or without electrical control.

If your car runs good without electrical control it probably is running rich to cover up a problem. When the OVP is installed the system tries to adjust itself to its appropriate lean mixture. Your car either doesn't like it there or there is a problem with the control system. It will have to be monitored for the answer.

Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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