Distributor Advance Curve Question

[chris belyea]

I have a '70 911 E with a 0 231 159 006 (JFDR6) distributor. When I purchased the car it had an Electromotive electronic ignition but I wanted it to be more stock. My mechanic found a distributor and installed it. This past weekend I decided to check the timing because the car is idling too high. I found that at about 950 RPM I have about 10 degrees of advance. At 6000, I'm at 28 degrees. So I have about 18 degrees of total advance. Looking at the manual, I should have a bout 30 degrees. Is that correct? If so, what could be causing this?

Thanks

Chris

[Trackrash]

Are you running the MFI? Are you sure the distributor you have now is the same PN as original?

How is your car running?

Stock IIRC the idle should be 2* ATDC, which was required for smog. Ideally you would want ~7* BTDC idle advance. 10* may be a little too much, but?

Your total advance should be 30*, so you aren't too far off.

You can pull the dist cap off and twist the rotor to make sure the advance is not sticking. Perhaps compare to the old dist.

I would mark off your pulley every 10* and put a timing light on it and see how the advance works over the RPM range.

[chris belyea]

Yes I'm running a MFI. From the research I've done, I believe I have the correct distributor for the car. I have pulled the cap off and the rotor rotates and returns back. The runs fine. It just idles at 1600. Air adjustment screws will not bring it down.