D-jet troubleshooting, Only one item left on my list! Options

[saigon71]

My 1974 2.0 D-jet is running very strong, but there were two lingering issues with the FI that I wanted to address over the winter:

1. A severe idle "hunt." The engine would rush up to about 1200 RPM, then nearly stall...repeat cycle.

2. Every once in a while the car would buck, most notably at highway speeds...it wasn't bad, just annoying.

Last week I installed a new circuit board in the TPS purchased from Dave Sprinkle a few years back. It was calibrated according to the Pelican tech article using an ohmmeter.

I took a 210 mile road trip over the weekend to test things out. The car now idles perfectly through the entire warm-up sequence. Thanks Dave! (IMG:style_emoticons/default/beerchug.gif)

The problem is that I still have the same bucking issue. All my research points to the TPS. Any suggestions on what to check next?

[watsonrx13]

I finally purchased and installed a new Bosch 'Blue' coil on the car and tested it. It ran the same, i.e. I still have the hesitation after holding the throttle at 3000 RPM, then easing off.

I also removed the wire from the air temp sensor and drove the car. With the wire disconnected the car wouldn't idle and it continued to hesitate at 3000 rpm. Here's the wire I disconnected and the temp sensor. If this is not the correct sensor, can someone upload a pic showing the correct one?



--- Rob