[V8] TPS & Not-so-smooth Engine

[urq]

No, the same applies to the 5-speeds ... the ECU only receives the idle and
WOT switch inputs.  

Of course the first recommendation is to pull the codes ... 

I would start with the fuel pressure regulator and coolant temp sender.  The
effects on the dash are not likely to impact the operation of the engine.
If you have ProDiag or VAGCOM you can tell what temperature the engine
thinks it is running at.  If you see the temp reported to be low you might
want to verify that the thermostat is in fact working.  Another shade tree
troubleshooting technique would be to unplug the OXS to see how the behavior
of the engine changes.  I don't have any BTDT on doing this though ... 

Steve B
San Jose, CA (USA)

-----Original Message-----

You seem to imply there's a difference in manual cars. Does the throttle
sensor have any additional functionality on a manual car? I should have
specified earlier that it's a factory 5-speed I'm working on.

Thanks,
Sam

On Wed, Feb 18, 2009 at 1:04 PM, Tony and Lillie <
tonyandlillie1 at earthlink.net> wrote:

> On an automatic car, the TPS is only used for transmission functions,
other
> than full throttle and idle signals.
>
> The first things I'd check are the connections on the TPS, MAF, and unplug
> teh O2 sensor, and see what, if anything, changes. If you do end up
needing
> a TPS, I'd suspect Ron may very well have one, and I may if I do some
> digging for that matter.
>
> Tony
>
> ----- Original Message ----- From: "Samuel Mrowka" <smrowka at gmail.com>
> To: <v8 at audifans.com>
> Sent: Wednesday, February 18, 2009 10:05 AM
> Subject: [V8] TPS & Not-so-smooth Engine
>
>
>  Where can you buy a new throttle position sensor? Are they only sold at
>> the
>> dealer?
>>
>> Also, what other components should I check for a PT engine with these
>> symptoms:
>>
>> 1. Greatly increased fuel consumption (only 200 miles a tank).
>> 2. Hesitation, in the 1000 - 2500 RPM range (most noticeable on gear
>> changes), unless the throttle is greatly increased.
>> 3. Stuttering, in the same RPM range, unless the throttle is greatly
>> increased.
>> 4. Often frozen trip computer/MPG indicator.
>> 5. Sometimes, complete power loss unless the throttle is increased
>> slightly.
>> Then, a huge, and sudden, jolt of power when the throttle is increased.
>> This
>> problem often disappears with a restart
>>
>> The full-throttle power is there. The car has no issues with starting and
>> also the idle is completely normal.
>>
>> Thanks,
>> Sam