Multi "miss"?

[cbvet]

I mentioned in another thread that a turbo '66 multifuel I'm looking at seems to run a lot smoother than the one in my '70 non-turbo.
I always thought mine ran great, but now I wonder if there is something not quite right.
David Doyle suggested there may be a miss in my engine. How the heck can you tell?
I know how to locate a cylinder miss in a gas engine with spark plugs, but how can you isolate a weak or dead cylinder in a multifuel?
Eric
CBVET

 

[WillWagner]

With it runing, loosen 1 line at a time at the injector and see if the sound of the engine changes. WARNING...There is high pressure fuel in the lines, DO NOT put a bare hand over the fuel stream. You can fold up a couple of cloth shop towells and let the fuel spray into the rag, just so it doesn't make too much of a mess.

 

[doghead]

Wear safety glasses and leather gloves while doing the above test. Also be sure not to unthread the fuel fitting completely off(just enough to make it leak out only).

 

[m-35tom]

you only have to turn the nut 1/4 to 1/2 turn. another way is to check each individual exaust port with a thermometer as it warms up from cold.

 

[devilman96]

Ditto on the exhaust temp... Use a thermal gun its a much cleaner route.

 

[m-35tom]

it seems to me that a worn ip head will cause uneven idle, mine went bad and after i repaired it it idles much better and has much better performance. when i cracked the lines before, i got a spray at some injectors and a dribble at others.