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?

[larss]

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.

....

I also got this cycling after putting 1911cc together, worst during warm up. I found that if I put an extra 50 to 100 Ohms in serial with the 270 Ohm ballast resistor for the CHT sensor, the cycling was almost eliminated. The extra resistance makes the engine run somewhat richer (the CPU Believes the Engine is colder than what it is).

/Lars S

[DRPHIL914]

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.

....

I also got this cycling after putting 1911cc together, worst during warm up. I found that if I put an extra 50 to 100 Ohms in serial with the 270 Ohm ballast resistor for the CHT sensor, the cycling was almost eliminated. The extra resistance makes the engine run somewhat richer (the CPU Believes the Engine is colder than what it is).

/Lars S

- (IMG:style_emoticons/default/agree.gif) -exactly, i used the pot. to get the resistance that worked and then removed it and put the fixed resistance in like Lars did..