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Old Yesterday, 07:21 AM   #23
panda_gti3
Passed Driver's Ed
 
Drives: 2007 MKV GTI
Join Date: Sep 2018
Location: Colorado
Posts: 11
Alright guys. Still no access to VCDS. Spark plugs are black as all hell. So it appears to be running rich but saying "low pressure to rail." How is this possible if the fuel filter is new and rail pressure is calculated before the fuel gets to the injectors?
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Old Yesterday, 07:24 AM   #24
panda_gti3
Passed Driver's Ed
 
Drives: 2007 MKV GTI
Join Date: Sep 2018
Location: Colorado
Posts: 11
Fuel cuts are still apparent, but the car appears to be operating better and better every day... like extremely gradually. I just purchased it about a month ago. Apparently it sat for 4 months. Anyways... if this updated info helps anyone diagnose without VCDS let me know.
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Old Yesterday, 07:57 AM   #25
vwengineer
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Drives: Golf 5 GTI (stock AXX)
Join Date: Oct 2017
Location: Switzerland
Posts: 331
It's quite difficult to know what's going on if you cannot see what are the sensors reading. Your black spark plugs could by an entirely different issue, if I can give you one advice is to invest in VCDS or eventually ODB-11 which is a bit cheaper but I am not sure how it works. It's not cheap but I think it is the best investment you can do if you own a VW and you service it yourself. You will save money in the long run as you will not be throwing parts on your car hoping that it solves your problem.
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