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

[Robert Myers]

*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