[s-cars] Short term rough idle - follow-up

djdawson2 at aol.com djdawson2 at aol.com
Mon Jan 25 18:12:20 PST 2010 

 Check the vacuum lines from the door lock pump.

 


 

 

-----Original Message-----
From: Cory Pio <cpio921 at gmail.com>
To: djdawson2 at aol.com <djdawson2 at aol.com>
Cc: bob at chips-ur-s.com <bob at chips-ur-s.com>; s-car-list at audifans.com <s-car-list at audifans.com>
Sent: Mon, Jan 25, 2010 7:10 pm
Subject: Re: [s-cars] Short term rough idle - follow-up


What about a surging idle when you turn your headlights on?? Bad ground?new alternator? Someone just back into me so I'm looking at a fresh hood radiator, and condensor. Maybe a new bumper cover if I can convince the insurance guy it wasn't already there. 
 
Sent from my iPhone 
 
On Jan 25, 2010, at 7:37 PM, djdawson2 at aol.com wrote: 
 
> 
> The RS2 EM helps reduce the focus of heat at #5... always good.  You > should see a "hard working" 3B or AAN with a stock EM... cherry red > at #4 and #5. 
> 
> Again, based on the brevity of your symptom, I still think you might > be looking at a leaky injector... something Techron will not cure.  > It is amazing what a new set of injectors can do to smooth out an > engine, but really not worth the expenditure unless you can isolate > the cylinder... or you have deep pockets for an old car. 
> 
> Dave 
> 
> 
> 
> 
> 
> 
> 
> 
> -----Original Message----- 
> From: Robert Myers <bob at chips-ur-s.com> 
> To: djdawson2 at aol.com 
> Cc: cody at 5000tq.com; s-car-list at audifans.com 
> Sent: Mon, Jan 25, 2010 5:08 pm 
> Subject: Re: [s-cars] Short term rough idle - follow-up 
> 
> 
> 
> Dave, 
> 
> The most noticeable symptom is a slightly rough idle which smoothes > outnicely in just a few seconds after start-up.  I wouldn't > reallydescribe it as a miss.  The rpms are pretty solid.  It's > not"seeking" like what usually happens with a sticky ISV. 
> 
> The engine sports a nice RS2 EM. 
> 
> Bob 
> 
> 
> At 07:00 PM 1/25/2010, djdawson2 at aol.com wrote: 
> 
> Bob, 
> I dont' really agree that you are just guessing when you see those > typesof compression numbers.  I'd also argue the #5 cylinder is > where youare going to see to most heat (not #3), especially if not > equipped with agood EM. 
> 
> The bottom end of these engines tend to be very durable.  You're > notgoing to typically see a "miss" as a result of badrings/cylinder > walls either... a "miss" (assuming your fuel andignition systems are > working properly) is typically a symptom associatedwith valve/valve > seat wear... therefore, not sealing as well. 
> 
> Having a fresh head ready is always convenient on a high mileage car> (porting... no way).  But yours looks pretty healthy. 
> 
> Dave 
> 
> 
> 
> -----Original Message----- 
> From: Robert Myers <bob at chips-ur-s.com> 
> To: Cody Forbes <cody at 5000tq.com> 
> Cc: S-Car-List at Audifans.Com <s-car-list at audifans.com> 
> Sent: Mon, Jan 25, 2010 4:34 pm 
> Subject: Re: [s-cars] Short term rough idle - follow-up 
> 
> 
> *This message was transferred with a trial version ofCommuniGate(r) > Pro* 
> 
> 
> 
> Hmmm... Sales pitch? Have a nice AAN just sitting around waiting for 
> 
> a suck.. er..., customer? ;-) Uh...  How much?  :-D 
> 
> 
> 
> 
> 
> At 02:29 PM 1/25/2010, Cody Forbes wrote: 
> 
>> *This message was transferred with a trial version of CommuniGate(r)>> Pro* 
> 
>> Nah, I'd say it's fine. Cylinder 3 runs the hottest and seems towear 
> 
>> a bit more, but your numbers are reasonable. Without a leak downtest 
> 
>> any statement as to why that cylinder is low (piston rings,grouved 
> 
>> cylinder wall, dirty/bent/burnt valve, head gasket, etc) is justa 
> 
>> wild guess at best. 
> 
>> 
> 
>> Time to take apart a running car? No. 
> 
>> 
> 
>>  Time to casually search for a spare cylinder head tohave rebuilt 
> 
>> (and ported hehe) and ready to swap on to the car on a lazyweekend? 
> 
>> Probably. Even better of course would be the same plan with awhole 
> 
>> fresh, tweaked, engine going in. Then sell the old stuff when youare 
> 
>> done and recoup some cost. 
> 
>> 
> 
>> -Cody (mobile) 
> 
>> 
> 
>> On Jan 25, 2010, at 1:37 PM, Robert Myers<bob at chips-ur-s.com>wrote: 
> 
>> 
> 
>>> *This message was transferred with a trial version ofCommuniGate(r) 
> 
>>> Pro* 
> 
>>> 
> 
>>> Yeah, Cody. You're right and I screwed it up.  Now thequestion 
> 
>>> remains - do I need to get a new head gasket and/or valve jobon the 
> 
>>> car? 
> 
>>> 
> 
>>> Bob 
> 
>>> 
> 
>>> 
> 
>>> At 12:46 PM 1/25/2010, Cody Forbes wrote: 
> 
>>>> *This message was transferred with a trial version ofCommuniGate 
> 
>>>> (r) Pro* 
> 
>>>> Note that the compression gauge has a one way valve - itdoesn't >>>> hold 
> 
>>>> pressure in the cylinders, only in the hose for thegauge. 
> 
>>>> 
> 
>>>> -Cody (mobile) 
> 
>>>> 
> 
>>>> On Jan 25, 2010, at 11:28 AM, Robert Myers<bob at chips-ur-s.com> 
> 
>>>> wrote: 
> 
>>>> 
> 
>>>>> *This message was transferred with a trial version ofCommuniGate>>>>> (r) 
> 
>>>>> Pro* 
> 
>>>>> 
> 
>>>>> Original post: 
> 
>>>>> 
> 
>>>>> Hi Y'all, 
> 
>>>>> 
> 
>>>>> My well modified '95.5 urS6 has developed a relativelyminor but a 
> 
>>>>> bit disturbing problem.  On initial start-up theengine idles a bit 
> 
>>>>> roughly.  The idle smoothes out again after a few(perhaps 10-15) 
> 
>>>>> seconds and becomes as solid as a rock.  Obviouslythis is not, of 
> 
>>>>> itself, a major problem but it could be a portent ofsomething more 
> 
>>>>> serious to come.  Any ideas/suggestions? 
> 
>>>>> 
> 
>>>>> Other than the idle problem the car is runningsuperbly.   Let's 
> 
>>>>> see...  modifications which might berelated...  Running the Dave 
> 
>>>>> Forgie 1.8t coil mod as expressed by Apikol.  Allthe RS2 mods - 
> 
>>>>> turbo, ECU, EM, injectors.  Stromungexhaust.  Big FMIC, etc. 
> 
>>>>> 
> 
>>>>> Bob 
> 
>>>>> 
> 
>>>>> And now the follow-up: 
> 
>>>>> 
> 
>>>>> There were several suggestions ranging from "don'tworry about it" 
> 
>>>>> to 
> 
>>>>> "try some Techron" to "check out theISV" to "uh-oh might be a >>>>> blown 
> 
>>>>> head gasket".  (Oh joy.  :-() 
> 
>>>>> 
> 
>>>>> OK, here's what has been done since the firstpost: 
> 
>>>>> 
> 
>>>>> Item 1 - a can of Techron has been added to a 3/4 fulltank of fuel 
> 
>>>>> and about half of it has been burnt. 
> 
>>>>> Result 1: idle is smoother.  Not perfect yet butimproved.  (It 
> 
>>>>> wasn't REAL bad to start with so...)  Indicatingpossible dirty 
> 
>>>>> injector(s).  I'm planning on doing the Techronbit again the next 
> 
>>>>> time I fill the tank. 
> 
>>>>> 
> 
>>>>> Item 2 - I pulled and inspected all the NKGplugs. 
> 
>>>>> Result 2 - They all looked the same - dry and withnormal 
> 
>>>>> coloration, 
> 
>>>>> no excessive wear.  They looked as good as anyplugs of that age 
> 
>>>>> in a 
> 
>>>>> big boost I5.  There is a hint of black deposit onthe threaded 
> 
>>>>> portion of #1 well outside the internals of the enginearea.  It 
> 
>>>>> is a 
> 
>>>>> little greasy feeling and left a smudge on thefingers. 
> 
>>>>> 
> 
>>>>> Item 3 - The symptoms don't seem to indicate ISVtroubles to me >>>>> so I 
> 
>>>>> haven't messed with it (yet) - I will if the problempersists. 
> 
>>>>> Result 3 - none (yet). 
> 
>>>>> 
> 
>>>>> Item 4 - While the plugs were out I checked thecompression of each 
> 
>>>>> cylinder (only one try - no repeated testing andaveraging, >>>>> cranking 
> 
>>>>> time was the same for all cylinders twelve pulses percylinder) and 
> 
>>>>> found: 
> 
>>>>> Result 4 - 
> 
>>>>> Cylinder    max pressure 
> 
>>>>> 1          150 
> 
>>>>> 2          150 
> 
>>>>> 3          135 
> 
>>>>> 4          160 
> 
>>>>> 5          155 
> 
>>>>> 
> 
>>>>> Additionally after cranking the gauge was just leftalone while 
> 
>>>>> still 
> 
>>>>> connected to the cylinders.  The pressure held andthere was no >>>>> sign 
> 
>>>>> of leakage - at least not in the short term (a coupleof minutes). 
> 
>>>>> 
> 
>>>>> I'm not thrilled with #3 pressure but it is prettyclose to being 
> 
>>>>> acceptable. 
> 
>>>>> 
> 
>>>>> OK, whadya think?  Should I be making anappointment with my 
> 
>>>>> favorite 
> 
>>>>> independent Audi wrench or should I just quit pickingat nits and 
> 
>>>>> get a life? 
> 
>>>>> 
> 
>>>>> Bob 
> 
>>>>> 
> 
>>>>> _______________________________________________ 
> 
>>>>> S-CAR-List mailing list 
> 
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> 
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> 
>>> 
> 
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> 
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