[s-cars] I'm broke but my car is filthy rich (update)

Tue Jul 3 03:43:11 PDT 2012

Darin,

I have two thoughts for you:

1. Is there any chance your ECU got wet?

2. If the fuel is only leaking at or near full, pull the access cover in the trunk and I am sure you will find that a "plug" 
for an un-used furl fitting has ripped/rotted. BTDT.

Good luck
Chris

>________________________________
> From: Darin Nederhoff <scarsgo at gmail.com>
>To: "S-Car-List at Audifans.Com" <s-car-list at audifans.com> 
>Sent: Monday, July 2, 2012 11:13 PM
>Subject: Re: [s-cars] I'm broke but my car is filthy rich (update)
> 
>Well, I've done a bit more prodding on my non-uber S4.  Pulled the plugs
>and O2 sensor that had been in there since last November and they were all
>dark as the night with soot on all cylinders.  When I start the car and
>initially start driving things seem OK until it gets up to full operating
>temp - then it starts running like horse$h!t.  Putting in clean (lightly
>used) plugs and a new O2 sensor did noting.  Did a test for boost leaks and
>she's as tight as can be at least up to the 18 psi I was able to put into
>the system with my little compressor.  The car does still make full boost
>albeit with a cloud of black smoke out the back.
>
>Tonight I swapped in my other RS2 fuel pressure regulator and there was no
>change.  I haven't been able to test the fuel pressure otherwise since the
>034 fuel pressure gauge leaks no matter what I seem to do (grrr) and
>honestly it's been so hot here in Minneapolis I haven't been able to bring
>myself to mess with it.
>
>This video clip shows how the car runs once it gets warm... things just get
>lumpy and it stinks up the neighborhood.  I need to change my clothes after
>a few minutes exposure to the overly rich exhaust.  Nasty.
>http://youtu.be/ENUIXHJ5J4g
>
>The car does have a Bosch 040 fuel pump from 034 as well as their fuel pump
>wiring harness kit.  At times it has been crazy loud (
>http://youtu.be/O3Tkn8VDos4 ) after longer drives.  Would fuel TANK
>pressure have any potential effect on things here?  I suspect I do have a
>leak brewing at the fuel tank or on a line somewhere up by the tank
>connections.  Haven't been able to diagnose the location yet but I only
>really noticed wetness or a drip if the tank is full or near full.
>http://youtu.be/b7o3MK3Uc4I
>Anyone ever replaced a tank?  How fun is it?  ;-)   (I actually have a new
>tank for mine... but one thing at a time here.)
>
>Anyhow, any other ideas gents?  ECU issue perhaps?
>
>
>
>
>
>On Wed, Jun 27, 2012 at 6:14 PM, Paul Gailus <gailus at mindspring.com> wrote:
>
>> Darin,
>>
>> The suggestions about the fuel pressure regulator and MAF connections
>> sound like good things to check out.
>> Just for diagnostics have you pulled the plugs to see if they look about
>> the same. I'd expect all of them to be "sooty" if all of the cylinders are
>> running rich. If only one plug looks darker then the injector on that
>> cylinder is probably at fault.
>>
>> Does your added FP relay get activated through the original FP relay
>> contacts? If not then the new relay won't respond to a pump shutdown from
>> the ECU if it detects excess airflow through the MAF due to a boost leak.
>> But if there's a boost leak then more air will flow through the MAF causing
>> a rich mixture --but you already knew that :-)
>>
>> Regards,
>> Paul
>>
>> ---------------
>>
>> Darin Nederhoff scarsgo at gmail.com
>> Mon Jun 18 14:26:05 PDT 2012
>>
>> Previous message: [s-cars] Pikes Peak Urq Car #5 almost ready for 25th
>> year celebration....
>> Next message: [s-cars] I'm broke but my car is filthy rich
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>>
>>
>> --------------------------------------------------------------------------------
>>
>> Gents,
>>
>> After many years of reliable service my full RS2'd UrS4 has starting
>> driving me slightly insane.  Last year it developed an issue with a
>> high boost cut out problem which seemed very much like a weak coil.
>> After MUCH tail chasing it came down to the one year old Bosch fuel
>> pump being a bit too wimpy (the prior OEM Pierburg had worked
>> beautifully up until the day it suddenly died).  Anyhow, the pump was
>> replaced with the 034 Motorsports high flow unit and relay and the
>> problem went away... until a few days ago.
>>
>> Now it is a bit like deja vu.  Car is once again sporadically running
>> super rich at idle and under boost.  It sort of stumbles at idle and
>> stinks up the neighborhood with fumes and smoke.  Example:
>> http://www.youtube.com/watch?v=rkmTC2_RRj8&feature=g-upl
>>
>> Coils/boots, plugs, O2 sensor, bypass valve, intake hose and fuel pump
>> all done last fall.  I also tried swapping MAFs and carefully cleaning
>> my RS2 MAF last fall as well.  No change.  Tested over and over for
>> boost leaks and could find anything.
>>
>> I've been averaging 20.7 MPG in mixed city/highway driving although I
>> suspect that as of the last few days it is far worse.
>>
>> Anyone else ever dealt with this sort of thing?  Kind of scratching my
>> head here as this car rarely stumps me.
>>
>> One thing I DO notice is that it tends to act up more if it is
>> especially warm outside or hot & humid.  Could be coincidental....
>>
>>
>>
>
>-- 
>Darin Nederhoff
>Plymouth, MN
>
>http://S-CARS.ORG/site
><http://panasonicbikemuseum.info>
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