5ktq emissions woes

[ed armstrong]

I bet an oil-change, new plugs and air filter, a fresh
tank of gas and maybe a new O2 sensor will cure this
problem !


--- qshipaz at juno.com wrote:
> Greetings,
>
> The hangar queen ventured out of the hangar these
> past two days, boldened by the temporary tags,
> hoping to get legal.
> Patient is an 86 5ktq. Hasn't been registered since
> 12/99 in California, when it passed Cal emissions
> easily. I admit I have not done all the requisite
> filters yet, although the LOF has just been done.
> 94K on the (working) odometer. In AZ, a Quattro
> doesn't have to pass anything but the idle test (how
> would you dyno one??) and the equipment check (which
> it passed- car is bone stock, so far)
> Idle readings were 363 ppm HC and 7.45% CO!
> Standards are 220 and 1.20%.
>
> Clearly something is amiss. Fuel is mostly Chevron
> premium (but I can't vouch for the age of what was
> in the tank before- probably no more than a 1/4
> tank. And the car was driven around the neighborhood
> fairly frequently by the MBZ/VW shop owner who
> previously was the TQ's custodian. Could this be
> entirely due to the fuel?
>
> Thinking of Phil: "Don't guess. Pull the codes." I
> did. Tried twice, and get 4444, as well as a smooth
> idle at 900 rpm, only about 1.1 bar boost though. I
> attribute this to the fuel quality waking up the
> knock sensor. O2 sensor is my next guess- but
> wouldn't the code come up if that were the case?
>
> I am aware that there are many possible factors
> here. IME, messing with the CIS mixture screw only
> produces a foul-running car if you do not have a
> "sniffer" to check the emissions while you do so. So
> what am I missing? I could just bring it to the
> shop, but I've gotten away from that for every bit
> of mech. work I've done on the Q or the Z-car in te
> last two years. Surely I can figure this out- idle
> testing only can't be that hard a goal to shoot for.
> Any BTDTs will be much appreciated.
>
> Last thing- there is a crack in the downpipe, behind
> the turbo, at the factory weld. I realize this is
> serious, and will be replacing it very soon, but I
> don't think this negatively affects idle emissions-
> or does it?
>
> Before everyone jumps at me for not methodically
> giving it a full tune-up, T-belt, all fluids- think
> of this. I have driven the car approx. 20 miles
> before today. I have a bit of a philosophical
> problem with pouring hundreds of $ into a vehicle
> which currently has only a temp. tag and an open out
> of state title. I can't get title or registration
> until I slay this emissions dragon. Just a thought.
>
> Quattro Kool-aid: I had fun on the freeway today.
> Haven't run a turbo 44 on the highway in three
> years! The corkscrew ramps at double the posted 25
> were great. This is my first Quattro though I've had
> two other Audis- well worth it. But you guys knew
> that already... BTW no driveline vibes and the diff
> locks work. At 94K, this is a low-mileage 5ktq!
>
> Regards,
> Rob
>
>
>
>
>
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=====
-ed

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