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Car will not run, please help!

Old 07-04-2018, 02:01 PM
  #21  
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Will keep it updated. Yes that was a google photo, mine is clean but not that clean and I'm missing those rings on the engine cover.
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Old 07-04-2018, 02:17 PM
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Originally Posted by ltooz_a6_a8_q7 View Post
... If the seal broke, check to make sure, it may be just out of place, reseating it may help....
HPFP. HIGH pressure fuel pump. Really high... I wouldn't do that, let alone expect the design to be of that sort. Fuel coming out of electrical fitting is never a good thing regardless.

Last edited by MP4.2+6.0; 07-04-2018 at 02:26 PM.
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Old 07-09-2018, 08:52 AM
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So, I am replacing the passenger (US) side HPFP and the new one does not have an outlet hole plugged like the old one does. I can't get the screw out of the old one either; I already broke 2 bits...it's gotta be lock-tited in there. Should I just go to hardware store and hopefully get the same size screw to plug up this hole? I'm stuck here
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Old 07-09-2018, 10:25 AM
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Factory part or aftermarket? Given this delta, no I would be wary of any hardware store type mod not with OE type piece parts. I don't know if that area is inlet or outlet pressure though. Keep in mind design pressure can be like 120 bar on the high pressure side. 120 atmospheres...! Hence the brass attachment points, probably flare fittings or metal sealing rings and so on. On extracting it, if breaking sockets maybe get the allen wrench type torx tools? Put old one in vise and then rap long end of wrench with a hammer to try to break free. Maybe heat, but after part thoroughly flushed of fuel.

Notice BTW in the earlier pic the other side seems to have a sensor screwed in there. FWIW, on EKTA diagram it looks like there is no individual part listing for the plug:


Last edited by MP4.2+6.0; 07-09-2018 at 10:30 AM.
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Old 07-09-2018, 05:32 PM
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Thanks for the advice, MP. I did put old one in a vise and used a small impact on it, came right out. Plugged up the new one and installed. Car runs much better now. Before it failed, it was actually taking longer to start up (both cold and warm). Now it starts right up. Thanks for everyone's assistance.
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Old 07-09-2018, 09:41 PM
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Glad you fixed it. Please summarize the whole thing to help the next person.
Cheers,
Louis

Last edited by ltooz_a6_a8_q7; 07-10-2018 at 07:40 AM.
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Old 07-10-2018, 07:06 AM
  #27  
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Before



After help with others from this site and from doing some troubleshooting on my own, I figured it was the right side HPFP that was causing my ECU fuse to pop thus causing multiple faults and the car to not run. I first noticed that the connector for this HPFP was soaked in fuel, which caused it to ground out and pop the fuse. Tools used for replacement of right side HPFP (part# 079127025C): 17mm and 14mm line wrenches to take off fuel rails from pump, t-30 torx to take off pump. First I loosened the fuel rails going to pump very slowly and covered area with rags to avoid fuel spray. Then loosened the 3 T-30 torx bolts evenly holding down the pump (install same way). Took off pump, inspected cam follower for any damage (none noticed). Then installed everything tightening the two fuel rails. Started it up and checked for leaks, cleared codes, and car runs better than before.

Last edited by Mike141; 07-10-2018 at 07:09 AM.
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Old 07-11-2018, 03:09 PM
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Great to hear. Thanks for sharing.
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