[s-cars] Still on 4 cylinders, some background.

[Ingo Rautenberg]

Ooh -- likey your theory there, Bob!  May I suggest a Treatment of SeaFoam 
to remove any gunk in the lifters (maybe with a dose of dino oil) for a few 
hundred miles (up to five hundred) and then an oil and filter change.  Sure 
beats having to do a motor swap in his weather ;-)

Ingo

----- Original Message ----- 
From: "Robert Rossato" <r0ssat0_987 at att.net>
To: "'chris chambers'" <fastscirocco_2000 at yahoo.com>; <AUDIJIM at aol.com>; 
<s-car-list at audifans.com>; <quattro at audifans.com>; 
<Audi5TurboTech at yahoogroups.com>; <acna_pcc at yahoogroups.com>
Sent: Tuesday, December 20, 2005 10:29 AM
Subject: RE: [s-cars] Still on 4 cylinders, some background.


> I've been reading Jim's not-so-excellent adventures these past few weeks
> and at this point I'm more, and more convinced that it is lifters.
>
> Coils tend to be a problem under boost.  Jim's problem smoothes out with
> more boost.  Also, given that there was a significant change when he
> changed his oil, unless that was completely coincidental - which it
> still could be, it would definitely rule out anything electrical.
>
> One thing you could try is to change your oil again to a lighter
> viscosity, like a 5w30 and see what happens.  Just be sure to clean the
> drain plug area really, really well and drain into a clean container so
> you can reuse the 15w50 Mobil 1 you just put in.
>
> bob
>
>> -----Original Message-----
>> From: s-car-list-bounces at audifans.com
>> [mailto:s-car-list-bounces at audifans.com] On Behalf Of chris chambers
>> Sent: Tuesday, December 20, 2005 9:32 AM
>> To: AUDIJIM at aol.com; s-car-list at audifans.com;
>> quattro at audifans.com; Audi5TurboTech at yahoogroups.com;
>> acna_pcc at yahoogroups.com
>> Subject: Re: [s-cars] Still on 4 cylinders, some background.
>>
>>
>> Jim,
>>
>> Just because you have the same amount of spark on all cylinders
>> doesn't mean the coil is good. I'm wondering if you have more
>> than one weak Coil, before you start swapping out lifters I'd suggest
>> swapping your coil pack.
>>
>> Or atleast shipping it to somebody who can try it out on their car.
>>
>> Based on your tests so far 'm inclined to guess failing coils.
>>
>> HTH
>> YMMV
>> Chris
>>
>> --- AUDIJIM at aol.com wrote:
>>
>> > Since many of you are saying the same things, I'll let you know what
>> > I've
>> > done so far.
>> >
>> > New #4 coil and boot.
>> > 5 new spark plugs.
>> > 2 new POS.
>> > I have swapped #4 fuel injector with #5, no help.
>> > I replaced 5 fuel injector inserts.
>> > I replaced all of the fuel injector O-rings.
>> > I checked fuel injector signal at connector, good and is the same as
>> > the
>> > other 4 cylinders.
>> > I checked compression on cold engine, #4 was the best compression of
>> > the 5
>> > cylinders.
>> > I physically traced the wiring from the ignition and fuel
>> injector to
>> > the
>> > ECU, every thing checked out good.
>> > I swapped a known good ECU with no help.
>> > I removed the fuel injector rail and inserted the injectors and
>> > tested for
>> > fuel quantity and spay pattern, all injectors flowed the
>> same w/ good
>> > pattern.
>> > I removed the coil packs and boots, inserted spark plugs
>> and grounded
>> > to
>> > engine, all 5 plugs sparked consistently to each other.
>> > Spark plug condition (color and/or fuel saturation) is consistent
>> > between the
>> > 5 cylinders.
>> > No codes ever, unless I pull a connector from any of the fuel
>> > injectors.
>> >
>> > Before I pull the engine, I'm going to try one last thing that two
>> > people
>> > mentioned/suggested, lifters. An oil change with a different
>> > viscosity may have
>> > influenced a bad lifter to get worse, or possibly effected
>> the piston
>> > rings on
>> > #4 cylinder. I'm leaning towards the lifters right now. I come from
>> > the world
>> > of 10 valve turbo, and I can always hear a bad lifter on a 10v. Why
>> > can I not
>> > hear any lifter noise on a 20v? With this being an unknown, I will
>> > replace the
>> > lifters, valve cover gasket and do the whole timing belt water pump
>> > routine.
>> > After that, I have two more options. Replace the engine, and/or
>> > replace the
>> > engine and engine wiring harness. This might also account
>> for why the
>> > engine
>> > feels like it smoothes out over 3000 RPM. Sometimes when it is warm
>> > and running
>> > smooth, if I blip the throttle, it will run rough again and clear up
>> > right
>> > away, but that was before the oil change. Now it runs rough a lot
>> > longer than it
>> > used to.
>> >
>> > Jim
>> > ///S4cyinder
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>> >
>>
>>
>> Make April 15th just another day http://www.fairtax.org
>>
>>
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