thanks for your input. here are the answers to the questions you posed. they were helpful in eliminating certain possibilities.


>"Fully closed" is actually past center, with an open gap.

The bypass valve has an "open gap" on the bench or when not energized. Once on car and running, it is wide open.



>, it almost sounds as if your TPS is backwards.

I considered this, but the end of the throttle body butterfly shaft is squared off on one side; TPS fits only one way. Also, the wiring harness could not possible reach if the TPS connector was on the opposite side. It also looks like all the pictures I have seen.

>Bentley does not identify which way is clockwise in its TPS adjustment procedure, so I can't compare what you did to what Bentley suggests.

Haynes says that 'counter clockwise' is toward the connector. I assumed they meant with the TB in my hand looking at the TPS. On my car, that would be rotation toward the driver's side.


>Last time I had a problem with the bypass valve, the connector on the wiring harness was faulty - one of the contacts lost it's "spring" and was very loose, causing intermittant idle speed weirdness. Splicing in a recylced connector solved the problem

Good thought, but my problem is not 'intermittant', it is constant high idle (950 rpm) and does not vary with operating temp.

>Is the ECU setting any codes?

No codes on ECU diagnostics.

You sound awfully familiar with this system. My TPS has three pins, #2, #3 and #18. I assume 18 (in the middle of the three) is the common pin and it is connected to ground when the connector is attached. The normally open set of contacts between pin 3 and 18 are closed when the throttle is fully closed. They open when the throttle is .030 open. contacts between 2 and 18 are normally open, reading continuity only at full throttle to send a signal to the ECU. Do you know if there is a rheostat in my TPS that should be sending a VARYING signal to the ECU? If the TPS is simply a switch, how does the ECU receive the position of the throttle to regulate and match the fuel flow thru the injectors?

any help greatly appreciated