VS V8 running issues

[mrv8]

Hi all,
My VS has started playing up. Its got a mean dead spot. It is very random, and doesnt matter whether the car is hot or cold. It is both under light and heavy throttle. Feels like the spark is being cut. Only codes it brings up is TPS voltage too low (but has for over 2 years) and VSS, which I also know the reason for, but both these codes were have been present for a while. Anyone else experienced this?
Thanx, Anthony.

[BlackVXGTS]

Refer to the item below. Suggest you change your TPS.

DTC 22 V8 ECM - THROTTLE POSITION (TP) (SIGNAL VOLTAGE LOW)
Circuit Description:
The Throttle Position (TP) sensor is attached to the throttle body, and is internally rotated by the throttle body shaft. It is a potentiometer with one end connected to 5 volts from the ECM and the other to ECM earth. A third wire is connected to the ECM, allowing it to measure the variable output voltage from the TP sensor.
As the throttle valve angle is changed (accelerator pedal moved), the TP sensor output voltage also changes in proportion. At a closed throttle position, the output voltage is usually below 1.25 volts. As the throttle valve opens, the output increases so that, at wide-open throttle, the output should be above 4.0 volts. By monitoring the output voltage from the TP sensor, the ECM can determine fuel needs based on throttle opening (driver demand).
A broken or loose TP sensor, or one that has an unstable output, can cause intermittent bursts of fuel because the ECM thinks the throttle is moving. Results could include engine surge or poor idle quality. If the ECM interprets a high voltage when engine RPM is less than 400, hard starting could be the result (Clear Flood mode). A problem in any of the TP sensor circuits will set either a DTC 21 or DTC 22 after the engine is started. Once a DTC is set, the ECM will use an artificial default value for TP sensor based on MAP and engine RPM to enable the vehicle to be driven, although performance could be less than normal.
The TP sensor is not adjustable. The ECM records the TP sensor voltage reading at idle and uses this as 0% throttle, so no adjustment is necessary.
DTC 22 will set if: TP sensor signal input voltage is less than about 0.2 volts for two seconds.

[VrWagz1]

Changed leads, plugs and rotor cap yet?

[mrv8]

Hi,
Have tested all the wiring etc, and know the TPS is faulty. did that when the light came on about 2 years ago.
As for thwe cap and leads, they have all tested ok, except one which I replaced.

[VrWagz1]

How did you test them. You need about 20 thousand volts to do that....do you have access to a HiPot tester? Its not continuity ur after, its load insulation breakdown you need to be worried about.

Have you had a look around the coil? It could possibly be the dfi module on the way out also.

Basically, to me it sounds electrical. Dosnt seem logical to be anything else. Though it could be somthing else, its just the logical choice.

[Not_An_Abba_Fan]

If you know the TPS is faulty, replace the bloody thing. It will produce the symptoms you are experiencing.

[mrv8]

I know i should, just keep forgetting to get the rep to bring one, only $32 for a new one. And as for the testing the stuff, have access to a fully equiped workshop with all the gear, even a dyno and all gear for reprogramming the late stuff, just havent been able to get the car to fault while being tested.

[BlackVXGTS]

I know i should, just keep forgetting to get the rep to bring one, only $32 for a new one.

Even genuine new TP sensors from Holden are only around $15. $32 is a rip-off - change your supplier.

[mrv8]

I'm over the ditch on the eastern island of Australia and Holden NZ want an arm and leg, so $32 is cheap here