Erratic throttle response when cold

[steamship]

Originally Posted by HPsauce

Note that I now have a spare briefly-used aftermarket one (noted earlier in the thread, cost me £34) that I just don't know for sure is good or bad.
Happy to pass it on at a big discount (P&P plus beer money I guess) if anyone wants it for testing.

Keep us updated over the next few days, and if the car is running well and you still have the other one, I'd be interested.

[HPsauce]

It's available now if you're interested as I still have the original factory-fit one as backup.

The one thing I can say is that I've seen different behaviour (slightly, but I'm convinced) between the 3 (original, aftermarket and latest Bosch) though the Bosch one has only been in for under 2 days.

It's probably not going anywhere now until Monday.

[Norretal]

Originally Posted by HPsauce

Still feeling good.
Picked SWMBO up just now from the station (3 miles away) and on the way back decided to try Sport mode. She was not best pleased.

It's a lovely feeling when an ongoing problem seems to have finally been sorted, your persistence looks to have paid off, congratulations

[HPsauce]

Originally Posted by Norretal

your persistence looks to have paid off

Thanks, but I'm taking nothing for granted as yet. It definitely feels better but I could be deluding myself or just be down to a change in the weather.

On an unrelated negative note, this evening my RNS-D decided my map CD (supplied by Adrian E and discussed at length elsewhere) wasn't valid, though it did eventually work after several ejects/inserts. Odd as neither car or weather were hot (usual factor in unreliability) and it's been fine for quite a while now even on the hottest days.
Though I guess there will be a new map release soon?

[HPsauce]

Been for a bit of a potter today and all seems well. Fingers and legs crossed.

Observing the revs/gears very carefully the change points don't seem much different to when it was in "slugged" mode, so I think the gearbox behaviour is consistent, just a huge loss of engine power.

I'll plug in VCDS shortly but don't expect to see anything of interest except the ever-recurring, intermittent and elusive ABS code "01119 - Gear Recognition Signal".
Edit. Forgot the alarm horn, low internal voltage - another job already on the list. Otherwise clean as a whistle!

[HPsauce]

Today I've done a fair few miles (200?) over lots of short journeys and a couple of longer ones. (and made two visits to my favourite V-Power emporium! )
No embarrassing "lack of power when pulling out" sessions I'm glad to say. And generally the car feels very sprightly, my right foot has been much lighter than recently but with better effect.

Had a couple of odd moments, but they were just moments and when I was doing out-of-the-ordinary things. I think they were the typical "confused ECU" events that I've experienced on many automatic cars where with sudden changes of turning, braking and accelerating the electronics can't quite decide what you're actually trying to do and change into the wrong gear at the wrong time then change again quite quickly to what you really need.

As an aside I wasn't 100% sure on my kickdown switch, so I checked it's "click" and decided clockwise was "on", then tested it as I joined the M25. Straight past 6000rpm in a flash!

[HPsauce]

Originally Posted by HPsauce

I'll plug in VCDS shortly but don't expect to see anything of interest except the ever-recurring, intermittent and elusive ABS code "01119 - Gear Recognition Signal".

Shock, horror!

I plugged in VCDS after fixing the alarm horn with new batteries, cleared the errors related to that and did a full scan.

What did I find to my total amazement? I've never, ever seen this before.
Nothing. Zilch. Nada. Sod all. No error codes whatsoever! A totally clean scan.

Even the 01119 has gone. Could the new Fuel Pressure Regulator have cured that? Or (worse) something else cured the 01119 which was in turn causing the throttle oddness.

[ainarssems]

More likely this:

Or (worse) something else cured the 01119 which was in turn causing the throttle oddness.

Fault and incorrect signalling could cause torque reduction request being sent from ABS to ECU, hence varying throttle response. Possibly dirty ABS sensor or ring.

[The_Laird]

Originally Posted by HPsauce

A totally clean scan.

Delighted for you!

[Architex_mA8tey]

I think you should celebrate by coming to audis in the park . . . I promise I wont touch your rear headrests!!!