Wont rev above 1500 RPM then cooled, continued.

[Leif Karlsson]

Ok, Im still having trouble with this one.

I have checked the idle switch: Works just fine.

So I pulled the error codes. It told me that the temp. sensor is bad. I
also got an error code that I don't recognize: 3434 (or possibly, 4343),
anyone know what this on is about? Anyway, the last one don't seem to
appear again.

So I replaced the temp. sensor, still no good: The old one was
definitely bad, the new one however gives me correct readings (about
2500 then cold and ~300 then warm) but the ECU still tells me that the
temp. sensor is bad... And it doesn't run like it should then cooled, if
anything it runs worse like there wasn't a temp. sensor at al.

Bad wiring comes to mind, is there a good way to test if the ECU signal
gets through al the way to the temp. sensor? Or is there something else
that can make the ECU think that the engine is warm then it really isn't
and therefor make it believe that the temp. sensor is bad?

Any ideas are welcome.

Best regards,

Leif

> Hello,
>
> Newbee warring I guess. Haven't owned a Audi before, and new to this
> list also. I've searched archive a bit, couldn't find anything about my
> car's particular problem, but it seems to be the right place to ask.
>
> Brought a not so new car a while a go: Audi Coupe, 90 2.3E (KE III
> Jetronic). It has been messed with, probably allot... It's giving me a
> headage.
>
> It wont get above ~1500 RPM then cold (about 15C outside right now),
> sounds like it cuts of the fuel then it gets close. It's not like it's
> not responding to engine temp, idle is about 1200 rpm the cold and 800
> rpm then warm. It just isn't getting the fuel it needs.
>
> I have adjusted the current to the pressure acurator (was way of, ~18 -
> 22 mA, warm engine), it's now -2 to 5 or there about, that fixed allot
> of bad behavior, but not the problem above. I checked the temp. sensor
> on top of the radiator hose flange. It works, (but I don't know if it
> works _right_: about 1.78 ohm at ~70C and 0.48 at 90C). I can't find any
> obvious leaks (first thing I checked). Ignition plugs, rotor, wires &
> cap have ben switched at least twice the last two years (I guess im not
> the first one that try's to fix it...).
>
> Good ideas anyone?
>
> Best regards,
>
> Leif