Engine, Fuel or FI problems, spitting and sputtering again Options

[malcolm2]

75 1911cc with L-jet.

back in January I made this post:

http://www.914world.com/bbs2/index.php?s=&...t&p=2286395

I have been driving quite a bit since then, even took a 6 hour round trip day ride to Knoxville. My guess it 4 or 5 tanks or about 1800 miles and no issues.

Same thing happened today... Driving home from work on the interstate, MPH at 80, revs about 3400. Again, going up a long low hill, not far from my exit. I could feel some spitting and sputtering.

The VDO CHT ring under #3 started heading down. Dropped to 200*F. When I exited and took my foot off the gas, it died. Started right up and I made it home braking with my big toe and gassing with my little toe.

This time, I have a 1/2 a tank of e10 gas (not positive on that). So it is not running empty as hoped last time. Fuel pressure was at 40 on the engine bay gauge.

Other suggestions last time were the filter. I am going to remove that today.

With the #3 temp as it is, I might should start there. I will try my induct timing gun on it to see about spark. Need a noid light for the injector. and i'll take a look at the plug.

I'll remove the disty and take a look. But #3 seems to not be firing and generating heat.

I'll update, but any other ideas?

Thanks,
Clark

[r_towle]

Djet floods when the MPS fails.

Ljet could flood when and if the flapper door gets stuck wide open (80 mph) and then you go and let off the pedal, yet the flapper is still calling for lots of fuel.

It is a 40 year old part....

Timothy may know how to test it electrically, and to test it physically, just pull off the rubber hose and gently use a finger or pencil to feel it open and close....if you feel any notchy area, you need to rebuild it.

these things are rebuilt all the time for the 944 guys, so they could not possibly last that long.

If you look online, you will find the 944 AFM rebuilders....small shops.

I would suggest you see if you can find a spare right now...and get that rebuilt.
Till then, stop doing what you did...

rich