TPS issues

[papak]

I'm throwing this one out to the brain trust. I have a Typhoon ECU on a 2.3l Duratec with Jenvey throttle bodies and a Colvern 17 TPS. When we calibrate the TPS with the engine off, it is perfect (It should be as it is new). When we record an engine run for later analysis, the recorded TPS data shows 0. Performance wise, there is a clear problem coordinating throttle position while running. I have heard that the Colvern TPS is known to have several failure modes. I have verified the wiring continuity. There is no unusual heat source affecting it. No adjacent wiring to cause interference. Is there a better alternative TPS? The Standard TH 265 could work with some modification. Any ideas?

[fastg]

Clarify something for me, can you monitor TPS real time? So you saying the moment you start the engine the TPS goes to 0 and stays there? Or does it dance around and sometimes go to 0?

 

Graham

[slomove]

I had the Colvern TPS fail after hosing it down by mistake and replaced it with a contactless (magnetic) Penny and Giles TP8RH sensor. Works great but very expensive. May also need tweaking of the injection map since the response is not exactly identical to the Colvern TPS.

[papak]

If I connect a laptop, we can monitor TPS in real time as well as injector pulse width, lambda and anything else there is a sensor for. The problem we have is that road performance under load is not showing any TPS signal. What differences did you encounter with the P&G?

[slomove]

....What differences did you encounter with the P&G?

In principle no difference (as it should). But the hall effect sensor is not a potentiometer with a mechanical slider on a carbon strip. It is all solid state, no-contact and sealed so should be more reliable.

Not sure about your symptoms, but if you can get the TPS to respond under certain conditions and not under a different condition it may not be the TPS after all but the ECU or the wiring? Can you tap into the TPS wiring to check the if the output voltage is changing when moving the throttle?