2.0 Liter Stalling at Stops

[johnharrill]

I have a 2.0 liter coupe (1967) that starts and runs very well. Carbs rebuilt recently. Ignition is new - MSD and Pertronix trigger, wires.
However, with the warm idle set at 800 rpm, when I come to a stop, the engine revs drop and it dies unless I blip the throttle.

Nearly everything in the car is new, having just finished a lengthy restoration:
New fuel tank, gold top Bendix pump, all lines, FilterKing filter, etc.

Thoughts?

[johnharrill]

Beuller?

[Dinoswede]

Re your description, I would guess you have a fuel feed issue, rather than an ignition problem.

Have you adjusted the fuel pressure through the FilterKing to feed the Webers with 0.25 Bar?

Also, the Weber float level adjustment is of great importance. Note that DCN 40 and DCNF 40
have different recommended float level hight!

The Weber idle mixture needles can cause fuel starvation in low rpm:s, if adjusted all too lean.

Well, just a thought...


Dinoswede

[johnharrill]

Thanks for the responses.
At some point in the past, I raised the float levels when chasing a flat spot around 2500 RPM. That, and a jet change solved the flat spot.

Two things I will try/verify:

• Float levels for DCNs.

• Measure fuel pressure with a gauge while driving.

I'll report my findings.

[2dinos]

+1 on float height! It's actually quite sensitive. 0.25mm (.010") can be noticed when positioning the mixture screws. Also, you may notice a flat spot on acceleration and sputtering when backing up.

Take your time on this one.