Lost a cylinder, Car is missing bad Options

[catsltd]

Been working steadly on fixing my 1974 1.8L.
New injectors,plugs,Petronic point replacemnt.etc.

Driving to the store when all of a sudden something happened.
Car felt like it had dropped 1 of the cylinders.

Car does not rev at all,made it home and parked it.

Diid a compression test (cold),110 110 100 90.

Not happy with 90 on cylinder 1 but felt at least like motor should still be running.

Where do I go next.????

I have a dual vacuum line throttle body,and a single vacum on my for sure non stock distributor that had a 4500 RPm rev limiter.

(Distribitor mark for cylinder 1 is 180 degrees out.)

Like I said I put on a pertronic 1847 and a petronic blaster coil and 8MM wires.

I am thinking its a spark think,but really dont know what to do at this point.

I have ordered a Mallory Unilite distribitor(4554101),but wont install it till I figure this out.


Hoping for some help from you guys.
Thanks Grant.

[Dave_Darling]

First, find out which cylinder is dead.

Next, see what is wrong with it. You need three things to fire: Fuel, air, and spark. The compression check is a reasonable proxy for checking the air. (Your numbers sound on the low side, but lots of things can affect that, many of which don't reflect on the health of the engine.)

It might be worth pulling the valve cover off that side of the engine and looking at what happens to the valves. When they close, is one of them further down toward the head than the rest? If so, and especially if that's the problem cylinder, suspect a dropped valve seat.

So check the spark by hooking up an extra plug to that plug wire and taping it to ground. Crank the starter and look at the plug, you should be able to see a nice white spark.

If you have spark, check the fuel. You can remove the injector from the intake runner pipe and stick it in a jar. Crank the starter and watch the jar--does it get fuel? Or you can pull both injectors off that side and put them both in jars; that way you can compare the spray pattern and the amount coming from each.

If all of the above checks out, see if the car runs OK again. If not, then the main suspect would be amount of fuel going in.

--DD