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124 Posts
I am dealing with a K20A2 swapped Fiat X1/9 that returned to the shop with apparently a bad TPS.
What I have done:
Checked wiring continuity between TPS connector and ECU pins. All good.
Swapped whole TB with a presumed good unit from another car. Car runs fine.
Replaced TPS with new. Ran great for the 80 miles I have driven it. Boss drove it today and it freaked out.
The reason I still suspect TPS is that, as you see in the screenshot, MAP indicates that the engine is under steady load, but TPS sporadically goes to zero. When this happens, mixture spikes lean and injectors apparently are being shut down.
As I said, I checked wiring continuity from end to end. Should I suspect bad wiring or a bad new TPS?
**DEVELOPMENT**
Swapped presumed good TPS back into car and it acted up again. Datalogs show that I am losing TP signal, but a bad original TPS, a bad new TPS and a bad used OE TPS from another car all together seems far fetched.
What I have done:
Checked wiring continuity between TPS connector and ECU pins. All good.
Swapped whole TB with a presumed good unit from another car. Car runs fine.
Replaced TPS with new. Ran great for the 80 miles I have driven it. Boss drove it today and it freaked out.
The reason I still suspect TPS is that, as you see in the screenshot, MAP indicates that the engine is under steady load, but TPS sporadically goes to zero. When this happens, mixture spikes lean and injectors apparently are being shut down.
As I said, I checked wiring continuity from end to end. Should I suspect bad wiring or a bad new TPS?
**DEVELOPMENT**
Swapped presumed good TPS back into car and it acted up again. Datalogs show that I am losing TP signal, but a bad original TPS, a bad new TPS and a bad used OE TPS from another car all together seems far fetched.