[s-cars] 1995.5 S6 Running Real Rich, Flooding Under Boost

[swhouser at gmail.com]

Hi. This problem's been solved, more or less. 

Carefully checked all boost hoses (Samco's and new 034 MAF to turbo), replaced crossever pipe with a steel one from an S4. Replaced FPR, and N75....both original on the car. Cleaned MAF sensor and contacts. Swapped out the 02 sensor to be sure that the one replaced 7K miles ago was good. New plugs to be sure.  

Intereresting that not a single code thrown through this. 

Also early on swapped in another 034 kit.....just to be sure that mine was OK. Also as overkill hooked up the old coils and POS's. 

So now, the issue is that I'm running very lean when under heavy boost. At WOT,  it's still lean. You'll see that I'm starting another thread looking for  fuel pump suggestions.  The FP is clearly not pulling enough fuel. We found a kinked line that may have been an issue, as well. 

So this issue of running too rich is behind us, fingers crossed. Thanks for the advice and suggestions. 

Scott



Sent from my Verizon Wireless BlackBerry

-----Original Message-----
From: Joshua van Tol <josh at spiny.com>

Date: Fri, 6 Feb 2009 21:14:52 
To: <swhouser at gmail.com>
Cc: <fastscirocco_2000 at yahoo.com>; Audifans<s-car-list at audifans.com>
Subject: Re: [s-cars] 1995.5 S6 Running Real Rich, Flooding Under Boost


Have you checked for a torn diaphragm in the fuel pressure regulator?  
Usually that would be worse at idle/high vacuum conditions, but who  
knows?


On Feb 6, 2009, at 9:06 PM, swhouser at gmail.com wrote:

> Thanks, Chris.
>
> Bear with me as I haven't been near the car for the week (I know  
> that sounds crazy....but this has been driving me crazy!)
>
> I know that the MAF sensor was swapped with no change, but I'll  
> clean and check the connectors to make sure we're OK there(if he  
> didn't do it) My tech had pretty much ruled out the MAF, but we'll  
> double check.
> What I'm trying to "connect" is why this would have happened as the  
> new coil kit went in, and as a new MAF to Turbo hose was  
> installed.  Seems to have perhaps opened up the diaphragm tear in  
> the WG, and now this. Wierd.
>
> Thanks for the ideas. I'll look into any and all.
>
> Scott
>
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: chris chambers <fastscirocco_2000 at yahoo.com>
>
> Date: Fri, 6 Feb 2009 18:55:24
> To: <swhouser at gmail.com>; Scar<s-car-list at audifans.com>
> Subject: Re: [s-cars] 1995.5 S6 Running Real Rich, Flooding Under  
> Boost
>
>
>
> Scott,
>
> a bad MAF or dirty contacts on the MAF/MAF cable can cause
> the ECU to think it's in an overboost situation, normally when
> this happens it shuts off the fuel to stop the overboost.
>
> I had this happen to my car, felt like I hit a wall cause the engine
> basicly shuts off momentarily due to the shut off of fuel. If I drove
> with no boost it ran fine up to redline, but if I accelerated hard
> it "bucked" at ~ 4k rpm.
>
> So I'm wondering if the same problem could fool the ECU into thinking
> there is more boost than there actually is (but not overboost) and  
> supply
> more fuel for the boost it "thinks" is there.
>
> You might want to take some contact cleaner to your MAF sensor's  
> connector,
> and to the MAF cable's connector. If you have another MAF sensor  
> you might
> want to swap it in, but make sure the cable/s connector is clean  
> and not
> corroded.
>
> HTH
> Chris
>
>
>
>
> --- On Fri, 2/6/09, swhouser at gmail.com <swhouser at gmail.com> wrote:
>
>> From: swhouser at gmail.com <swhouser at gmail.com>
>> Subject: Re: [s-cars] 1995.5 S6 Running Real Rich, Flooding Under  
>> Boost
>> To: fastscirocco_2000 at yahoo.com, "Audifans" <s-car-list at audifans.com>
>> Date: Friday, February 6, 2009, 9:41 PM
>> Thanks, Chris.
>>
>> Plugs are F5DPOR's.....they were almost new and I just
>> replaced them with a second set to be sure. Think we're
>> OK there.
>>
>> O2 sensor is almost new. Think that could fail in about 6K
>> of driving....a year? Maybe we'll swap that out
>> And see. Lee has probably tried that already.
>>
>> Runs very smoothly out of boost, even under load.
>>
>> Thanks.
>> Sent from my Verizon Wireless BlackBerry
>>
>> -----Original Message-----
>> From: chris chambers <fastscirocco_2000 at yahoo.com>
>>
>> Date: Fri, 6 Feb 2009 18:24:50
>> To: <s-car-list at audifans.com>; Scott
>> Houser<swhouser at gmail.com>
>> Subject: Re: [s-cars] 1995.5 S6 Running Real Rich, Flooding
>> Under Boost
>>
>>
>>
>> Scott,
>>
>> I'd check and make sure it has the right spark plugs,
>> plus I'd
>> be suspicious of the oxygen sensor as a bad oxygen sensor
>> will
>> make it run rich.
>>
>> HTH
>> Chris
>>
>>
>>
>> --- On Fri, 2/6/09, Scott Houser <swhouser at gmail.com>
>> wrote:
>>
>>> From: Scott Houser <swhouser at gmail.com>
>>> Subject: [s-cars] 1995.5 S6 Running Real Rich,
>> Flooding Under Boost
>>> To: s-car-list at audifans.com
>>> Date: Friday, February 6, 2009, 8:29 PM
>>> Hi,
>>>
>>> First post. This one is perplexing me, and our indy
>>> mechanic {who's good.}
>>> Any suggestions appreciated.
>>> Car has 82K miles, and a lot of work has gone into it
>> to
>>> make it right over
>>> the past year. Car has an IA Stage III+ chip {their
>> term},
>>> Samco hoses w/Breeze CT clamps. New 034 MAF to Turbo
>> Hose.
>>> {All mods are
>>> with 5K miles}
>>>
>>> We had a couple of dying coils, and decided to go with
>> an
>>> O34 HO coil kit
>>> after a lot of thought. After installation {a week
>> ago}
>>> we had lots overboost. Found a tiny tear in the WG
>>> diaphragm and replaced
>>> it. That was after checking, and swapping with
>>> another car { one of our shop's tech's has an
>> S4}
>>> the N75, the BPV, the ECU,
>>> the Fuel Pressure Regulator, and testing the coolant
>>> sensor, knock sensors,
>>> the MAF sensor, etc.  O2 sensor was new 5K miles ago.
>> New
>>> Fuel pump and fuel
>>> filter, as well.
>>>
>>> Right now the car will pull very smoothly, under load,
>> to
>>> 6000rpm as long as
>>> you stay out of boost. With more than 5 psi, the car
>>> stumbles, and is held
>>> back. It floods, and is obviously dumping unburned
>> fuel. A
>>> ton of black
>>> smoke. Very strong fuel smell. Pull the plugs and
>>> they're black with soot.
>>> We've pressure tested it to 20 lbs., and it holds
>> for 5
>>> minutes {maybe
>>> drops 1 lb.}. The car's been smoked. No leaks
>> show.
>>> Sure sounds like a boost
>>> leak.
>>>
>>> I'm away on business, and won't get to the
>> car
>>> until next week. It's at my
>>> mechanic's. He's real good and knows Audi
>> fuel
>>> delivery systems inside and
>>> out. He's stumped, and so am I. I guess that the
>> next
>>> step is to pull, and
>>> re-tighten all of the Samco's, to make sure. I
>> would
>>> have guessed a blown MM
>>> hose, but that's not it. I have a metal crossover
>> pipe
>>> on the way, but the
>>> plastic one looks fine. The intercooler tanks are OK,
>> but
>>> I'm replacing with
>>> an aluminum S4 IC.
>>>
>>> Any suggestions and ideas of what to look into much
>>> appreciated. As my tech
>>> says, "there has to be one tiny thing that
>> I'm
>>> missing."  Thanks, very much.
>>> _______________________________________________
>>> S-CAR-List mailing list
>>> S-CAR-List at audifans.com
>>> http://www.audifans.com/mailman/listinfo/s-car-list
>
>
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list