Help--cyl. 3 & 4 not firing

[Pritchard]

I have a stock '74 914 2.0L.

Recently I had the heads rebuilt. Afterwards, the car ran very well. Learning as I go, I learned that I needed to set the end play. So I removed the transmission, flywheel, etc. and set the end play. Reversed the steps and started up the engine. To my shock and horror, cyls. #3 & #4 were not firing. I checked for compression, good. I checked for spark, good. It was getting late so I haven't checked for fuel through the injectors yet or signals to the injectors. That's for this PM. I haven't disturbed the timing that I know of. It is still close enough for the other two to fire.

If you have any thoughts on what may be happenning, let me know.

Thanks

Pritchard

[Joe Bob]

Triger points in the bottom of your dizzy...if you are running FI...

[Pritchard]

I thought about that. But, correct me if I'm wrong, they fire in pairs (1&4, 2&3). So if I'm having problems with cyls. 3 & 4, I'm thinking that it wouldn't be the trigger points.

During lunch today I remembered that I banged the grounding connections near the air distributor several times while removing the nut on the starter/bell housing bolt. If I knocked on of the connectors loose, could this be the problem?

Keep your ideas coming please!

Pritchard

[Ian Cubus]

Hey Pritchard it sounds like you are tracking by checking those grounds. The F.I. system won't function properly unless those grounds are intact. Keep us informed. Thanks, Ian

[Dave at Pelican Parts]

Yup! On my D-jet wiring harness (74 2.0), there are three ground plugs. Each has two wires going to it. The wires are:

Ground for the ECU
Ground for the throttle switch
4 * ground for the injector

In other words, it is likely that one of the plugs has come off.

--DD

[Pritchard]

Bingo!!

It was the grounding plugs at the air distributor. Whew! Finally something easy to fix! Ha! Ha!

Thanks guys!

Pritchard