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

Mon Jan 25 16:32:04 PST 2010

Nope, I'm a 10v guy. An MC swap in your car would surely get us both  
killed and just be not too smart ;-).

-Cody (mobile)

On Jan 25, 2010, at 6:34 PM, Robert Myers <bob at chips-ur-s.com> wrote:

> *This message was transferred with a trial version of CommuniGate(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 to wear
>> a bit more, but your numbers are reasonable. Without a leak down test
>> any statement as to why that cylinder is low (piston rings, grouved
>> cylinder wall, dirty/bent/burnt valve, head gasket, etc) is just a
>> wild guess at best.
>>
>> Time to take apart a running car? No.
>>
>>  Time to casually search for a spare cylinder head to have rebuilt
>> (and ported hehe) and ready to swap on to the car on a lazy weekend?
>> Probably. Even better of course would be the same plan with a whole
>> fresh, tweaked, engine going in. Then sell the old stuff when you are
>> 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 of CommuniGate 
>> (r)
>> > Pro*
>> >
>> > Yeah, Cody. You're right and I screwed it up.  Now the question
>> > remains - do I need to get a new head gasket and/or valve job on  
>> the
>> > car?
>> >
>> > Bob
>> >
>> >
>> > At 12:46 PM 1/25/2010, Cody Forbes wrote:
>> >> *This message was transferred with a trial version of CommuniGate
>> >> (r) Pro*
>> >> Note that the compression gauge has a one way valve - it doesn't  
>> hold
>> >> pressure in the cylinders, only in the hose for the gauge.
>> >>
>> >> -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 of  
>> CommuniGate(r)
>> >>> Pro*
>> >>>
>> >>> Original post:
>> >>>
>> >>> Hi Y'all,
>> >>>
>> >>> My well modified '95.5 urS6 has developed a relatively minor  
>> but a
>> >>> bit disturbing problem.  On initial start-up the engine idles a  
>> bit
>> >>> roughly.  The idle smoothes out again after a few (perhaps 10-15)
>> >>> seconds and becomes as solid as a rock.  Obviously this is not,  
>> of
>> >>> itself, a major problem but it could be a portent of something  
>> more
>> >>> serious to come.  Any ideas/suggestions?
>> >>>
>> >>> Other than the idle problem the car is running superbly.   Let's
>> >>> see...  modifications which might be related...  Running the Dave
>> >>> Forgie 1.8t coil mod as expressed by Apikol.  All the RS2 mods -
>> >>> turbo, ECU, EM, injectors.  Stromung exhaust.  Big FMIC, etc.
>> >>>
>> >>> Bob
>> >>>
>> >>> And now the follow-up:
>> >>>
>> >>> There were several suggestions ranging from "don't worry about  
>> it"
>> >>> to
>> >>> "try some Techron" to "check out the ISV" to "uh-oh might be a  
>> blown
>> >>> head gasket".  (Oh joy.  :-()
>> >>>
>> >>> OK, here's what has been done since the first post:
>> >>>
>> >>> Item 1 - a can of Techron has been added to a 3/4 full tank of  
>> fuel
>> >>> and about half of it has been burnt.
>> >>> Result 1: idle is smoother.  Not perfect yet but improved.  (It
>> >>> wasn't REAL bad to start with so...)  Indicating possible dirty
>> >>> injector(s).  I'm planning on doing the Techron bit again the  
>> next
>> >>> time I fill the tank.
>> >>>
>> >>> Item 2 - I pulled and inspected all the NKG plugs.
>> >>> Result 2 - They all looked the same - dry and with normal
>> >>> coloration,
>> >>> no excessive wear.  They looked as good as any plugs of that age
>> >>> in a
>> >>> big boost I5.  There is a hint of black deposit on the threaded
>> >>> portion of #1 well outside the internals of the engine area.  It
>> >>> is a
>> >>> little greasy feeling and left a smudge on the fingers.
>> >>>
>> >>> Item 3 - The symptoms don't seem to indicate ISV troubles to me  
>> so I
>> >>> haven't messed with it (yet) - I will if the problem persists.
>> >>> Result 3 - none (yet).
>> >>>
>> >>> Item 4 - While the plugs were out I checked the compression of  
>> each
>> >>> cylinder (only one try - no repeated testing and averaging,  
>> cranking
>> >>> time was the same for all cylinders twelve pulses per cylinder)  
>> and
>> >>> found:
>> >>> Result 4 -
>> >>> Cylinder    max pressure
>> >>>  1          150
>> >>>  2          150
>> >>>  3          135
>> >>>  4          160
>> >>>  5          155
>> >>>
>> >>> Additionally after cranking the gauge was just left alone while
>> >>> still
>> >>> connected to the cylinders.  The pressure held and there was no  
>> sign
>> >>> of leakage - at least not in the short term (a couple of  
>> minutes).
>> >>>
>> >>> I'm not thrilled with #3 pressure but it is pretty close to being
>> >>> acceptable.
>> >>>
>> >>> OK, whadya think?  Should I be making an appointment with my
>> >>> favorite
>> >>> independent Audi wrench or should I just quit picking at nits and
>> >>> get a life?
>> >>>
>> >>> Bob
>> >>>
>> >>> _______________________________________________
>> >>> S-CAR-List mailing list
>> >>> http://audifans.com/mailman/listinfo/s-car-list
>> >>> http://www.audifans.com/kb/List_information
>> >
>> _______________________________________________
>> S-CAR-List mailing list
>> http://audifans.com/mailman/listinfo/s-car-list
>> http://www.audifans.com/kb/List_information
>