Could this be a lambda issue?
congrats and thanks for posting the solution! ;-)
"Redwood" > wrote in message
...
> "Redwood" > wrote in message
> ...
>> 1993 Audi 80 2.0 single point (ABT engine).
>>
>> It's my dad's car, had it from new & been well serviced over the years.
>> I'm trying to diagnose poor top end performance and thinking it may be
>> the
>> lambda sensor, or any other suggestions welcome.
>>
>> Starts & drives well but gutless at top end. Up to about half throttle
>> it
>> has plenty of pull but put your foot down for overtake or approaching
>> inclines and there isn't much there and takes a long time to build up
>> speed - usually have to knock it down the gears. Feels as though it
>> wants
>> to go but a lack of fuelling at top end is holding it back. In fact if
>> your cruising along say at half throttle and plant your foot down it
>> feels
>> like it actually slows down before very slowly starts to build up speed.
>> TPS & various other sensors appear ok (within Autodata spec) & checked
>> for
>> any vacuum, air leaks. The injector unit to manifold rubber flange
>> looked
>> a bit worn & cracked but I've replaced that.
>>
>> Only thing I can think of is the lambda sensor as the cars done about
>> 120k
>> miles on the original so was wondering if that could be on its way out
>> and
>> slow at sending the correct signal to increase fuelling at top end?
>
> Well it did turn out to be the lambda probe. Went for MoT yesterday and
> it
> failed on high emissions (0.5). The lambda passed but garage man said it
> was
> sluggish. New probe fitted and emissions passed & the car is running
> loads
> better with now plenty of pull at top end. Previously if you tried to
> hold
> the revs at a fast idle it would pulsate down & up slightly but now it
> holds
> steady.
>
>
>
>
|