Strange MPS issue, Lew's car Options

[914itis]

I am helping Brian with Lew's car. As most of you may know, it is a 2056 with djet.
The car was running fine, he drive it to CT one day and when he came back he noticed that the MPS was hanging. The car starts to run on 3 cylinders with #4 not firing. We checked for spark and injectors they are all fine, but if you remove spark wire #4, it had no effect.

The strange thing is if you elevate the mps about 6 inches up, it's all fine, even that 4th cyl works. All the electrical wires on the unit are fine

(IMG:style_emoticons/default/confused24.gif) ?

Dies the 2056 uses 1.7 or 2.0 MPS?

He would like to make it to Hershey.

[Mblizzard]

Also make sure you are connecting the vacuum correctly. I did it incorrectly and hooked it to the wrong side of the dizzy. I have an advance and a retard on my dizzy. Switch the and you get good idle with them plugged and very high when connected. I think the Cap'n corrected me on this.

Also check that the injectors are seated and that the do not have leaks. Yea I did that too!

Been playing with my MPS to adjust for my 2056. No air meter but I have it so it runs pretty well. I have two MPS's. One that I don't change and one the I adjust and see what changes. Be interested to seem what you come up with.

The oddest thing I have is what seems to be not pinging exactly but valve clatter when I start out slowly. Not there at higher rev or if I give it a good amount of throttle on the start. I think my TPS board is worn as I get a little bit of a slow start at times.

[worn]

Also make sure you are connecting the vacuum correctly. I did it incorrectly and hooked it to the wrong side of the dizzy. I have an advance and a retard on my dizzy. Switch the and you get good idle with them plugged and very high when connected. I think the Cap'n corrected me on this.

Also check that the injectors are seated and that the do not have leaks. Yea I did that too!

Been playing with my MPS to adjust for my 2056. No air meter but I have it so it runs pretty well. I have two MPS's. One that I don't change and one the I adjust and see what changes. Be interested to seem what you come up with.

The oddest thing I have is what seems to be not pinging exactly but valve clatter when I start out slowly. Not there at higher rev or if I give it a good amount of throttle on the start. I think my TPS board is worn as I get a little bit of a slow start at times.

The valve clatter also changes as the cylinders heat up, so that may play a role here.