lack of power issue

[Rokas Reipa]

Michael,

Even though you pressure tested the intake system, check the Michelin
Man hose. Remove and inspect carefully, replace if necessary. HTH,

Rokas
95.5 S6


On Thu, 21 Oct 2004 06:44:38 -0400, michael <kazin-audi at thismetalsky.org> wrote:
> 
> Car: 1990 200 Quattro 10v turbo.  TAP chip and wastegate spring, K&N filter,
> both installed by previous owner.
> 
> Symptoms: In gear, RPM won't reach 4000, severe loss of power, feels like
> there's no difference between 10% and 100% throttle, boost never above 0.9 bar
> as indicated by stock digital gauge.  Car struggles to accelerate, to get up
> hills, etc.  This started suddenly, no indication, no noises, nothing.
> 
> Replaced: thermostat, multi-function temp sensor, throttle position switch,
> plugs, wires, distributor cap & rotor, coolant, fuel filter.
> 
> Tested: compression looks good
> intake path from airflow sensor pressure tested, no leaks whatsoever
> ECU reports 4-4-4-4, no check engine light
> all fuses intact, all necessary relays present but untested
> audible whine from fuel pump
> turbo spins freely, no shaft play
> throttle opens and closes properly, and fully
> spark plugs a medium-light tan color
> temperature as indicated by dashboard gauge appears within range
> idle stabilization valve seems to buzz happily
> idles fine (other than minor warm start issue)
> 
> At this point, I think the next things to try replacing are going to be
> expensive.  I'm guessing it's a fuel delivery issue, the fuel pump sounds a
> little sick.  Though I'm comparing that to the Walbro pumps in my other two
> cars, I don't know if they're supposed to sound the same.  I also thought
> possibly it'd be injectors, or some part of the fuel distributor setup.
> Really, I don't know these cars well enough yet.  Also, I plan to change the
> oil... not that it will make any real difference.
> 
> I read that there's a screen somewhere in the fuel distributor that sometimes
> gets clogged, have not yet taken it all apart to test this, it was to be my
> next step.
> 
> I do not have volume 1 of the Bentley manual (though I have the other two,
> previous owner must have misplaced that one).
> 
> Anyone have any ideas?
> 
> --
> Michael Stella - http://www.thismetalsky.org
> '97 AWD Eagle Talon & '92 Galant VR4 #1000/1000 & '90 Audi 200 Quattro
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