Weird Engine Stutter
 

Help Please!

When I'm driving the car and just maintaining a constant speed or using very low throttle pressure the car stutters and hiccups quite badly, no problem once you start to apply enough throttle to make the car accelerate.

I've recently replaced the leads with Magnecors, had the distributor rebuilt and recurved and added a Pertronix, had the Webers apart, cleaned & rebuilt, replaced the coil.

The car is a '71T running a 2.4 S motor with 2.2 S pistons & Webers. The problem seemed to start a while after the Webers were apart....

Any ideas what the cause could be? :confused:

Thanks

I should add the the distributor cap is new and the NGK BP8ES plugs only have a couple of hours on them...

With Webers I would try hotter plugs to see if they help. try bp7es. I know the PMO guys recommend BP5es for carbed Porsches. Depends on your compression ratio. I'd go slow. Don't want to burn a hole in those pistons. Good Luck.

Are you convinced it's ignition related and not a carb problem? I'm no expert on carbs, but it sounds more like a fuel delivery problem at specific rpms and not an ignition fault or incorrect heat range on the plugs.

Cameron

I am having the same problem. I think in my case it is due to worn throttle shafts. I am curious to see if yours are the same.

I have a 71 2.2 s motor, 55 idle jets, 130 main, 180 a/c, f1 tubes and 32mm venturries.

Check out this thread.
http://forums.pelicanparts.com/showthread.php?s=&threadid=287335&highlight=Weber+ Idle+Air+leed+adjustment+opinions

Do you have much play on the throttle shafts?

Thanks Guys

I dd put some BP7ES plugs back in yesterday but haven't had the chance to drive the car. I also blew out the idle jets but that had no effect.
The throttle shafts seem ok but I will be pulling the carbs out in another week or so when I have more time to look at them more closely.
I'll keep you posted on progress...!