New TPS circuit boards $35, Courtesy of Dave Sprinkle Options

[srb7f]

I just want to give a shout out to Dave Sprinkle who is now making brand new TPS circuit boards for the 914 FI system.

This is seriously the best $35 I've spent on the 914 in as long as I can remember. It's a simple installation with the included instructions, and only took me about 30 minutes. After this, all of the jerkiness in the acceleration was gone just like that.

A new TPS is NLA, and cost about $150+ last I checked when they were available. This $30 part restores the switch, so get one while you can.

This will certainly keep me happy with my 2.0 until I have the time and $$ to convert to a 6!

[blitZ]

I've been trying to sort out some poor idle and hesitation and think it may be my TPS. Is there anyway to determine if it is bad? Visually, it looks fine and I have calibrated it.

[davesprinkle]

I've been trying to sort out some poor idle and hesitation and think it may be my TPS. Is there anyway to determine if it is bad? Visually, it looks fine and I have calibrated it.

The TPS has two functions:
1. Idle indication. The TPS has two contacts that indicate when the throttle is fully closed. The TPS calibration procedure takes care of this function. Your car will idle poorly if the ECU doesn't know that the throttle is closed.
2. Transient throttle detection. The serrated traces on the board act to detect changes in throttle position so that the ECU can add additional fuel. The car will have poor throttle response if this circuit isn't working properly.

If you've performed the TPS calibration procedure and you still have poor idle, you should verify that your sensor wiring is OK. Check the continuity of the leads from the TPS connector to the ECU connector.