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Old 02-19-2007, 12:14 PM
justinperkins's Avatar
I ♥ German Cars
 
Join Date: Sep 2006
Location: Austin
Posts: 1,312
No GP Light until second try

I did a bunch of work on my wagon this weekend, most importantly replaced all the GPs (at least one was noticeably bad) and switched to Mobil Delvac 1 (she is much happier now).

I'm 99% sure this is battery related, but when I turn the key to light the GPs the first time no light comes on, but if I turn the key back and then on again the light comes on fine (and it starts perfectly when cold). I notice that the fuel pump is running the first time (maybe to prime the system), but if I let it finish it's cycle it won't come on the next time I turn the key. I'm guessing this extra voltage that's used by the fuel pump the first time is causing too much of a draw for the GPs to even light up, is this correct?

My voltage when cold and not running is 12.7, but I noticed that when the fuel pump is running (no GP light), the voltage can drop down to as low as 12.1 volts.

Never had this problem before, but I guess now that all my GPs are in functioning order there is more of a draw and now they need more volts that my batter cannot provide.

I also replaced my oil level and oil pressure sending units, now my low oil level light doesn't come on during hard left turns, yippee. That oil pressure sender is in a tight spot eh? Had to get a stubby open end 17mm for that one.

Made an attempt at replacing the flex disc joints but couldn't for the life of me get the old (looks original) one out.
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1987 300TD, 1987 300TD
2008 R32, 2000 Passat Wagon
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