1977 Ford E350 460cid vacuum diagram?

[Colorado Osprey]

Anybody ever try a mixture of E-85 and gas at a 1:2 or 33% ratio to get these older (pre-80's) non-fuel injection engines to pass.
It used to be a fairly common practice to add high test alcohol to get vehicles to pass.

[Great-Kazoo]

Anybody ever try a mixture of E-85 and gas at a 1:2 or 33% ratio to get these older (pre-80's) non-fuel injection engines to pass.
It used to be a fairly common practice to add high test alcohol to get vehicles to pass.

The lines will have issue with e-85. replacing the vac lines, checking the EGR valve and replacing the PCV valve should do it. The sympton showing is conducive with vac lines AND the often overlooked, EGR. Hooking a vac tester to the EGR will tell you if it is opening or not. Usually a removal (after soaking the bolts) in a good rust penetrater like CRC, etc makes it much easier. The guts of the valve clog up with carbon.

TWO other items often overlooked, the valve cover breather should be replaced AND one that fails a lot of vehicles, The Gas Cap.

[Bitter Clinger]

Anybody ever try a mixture of E-85 and gas at a 1:2 or 33% ratio to get these older (pre-80's) non-fuel injection engines to pass.
It used to be a fairly common practice to add high test alcohol to get vehicles to pass.

I did something similar to get my 66' buick to pass. Damn near empty on gas, pour some 100% rubbing alcohol in the tank. BG 44k works wonders as well. And as a die hard bow tie man i must say......

[RonMexico]

Anybody ever try a mixture of E-85 and gas at a 1:2 or 33% ratio to get these older (pre-80's) non-fuel injection engines to pass.
It used to be a fairly common practice to add high test alcohol to get vehicles to pass.

Yep, tried it in my 1978 ford and it still failed. I used 80% e85 and 20% 91. It was an improvement but if an engine has a bad vacuum leak it won't help.

[Great-Kazoo]

Yep, tried it in my 1978 ford and it still failed. I used 80% e85 and 20% 91. It was an improvement but if an engine has a bad vacuum leak it won't help.

One thing i forgot regarding the 77 fords. IIRC 75-79? had issues with rough idle. There were a few fixes, temporary, it's one of those things. However making sure there are no vacuum leaks is one less thing contributing to overall performance and possible a lean burn / valve issue down the road.