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I haven't worked on one of these for a while but... Do a compression test, had one that had the automatic lash adjusters for the valves stick and hold some of the valves slightly open. Virtualy no compression on two cylinders but would just barely start and ran better the higher the revs got. Just do a compression test, I dont know the spec, put the cylinder will run if its got over a hundred psi by rule of thumb. Plugged exshaust fits your symptoms pretty good. Cant rember how the catilist is mounted but basicly cut or undo the the pipe to the cat and see if it runs better. You can do this test with a pressure guage, but why spend the money, you will be able to tell imediately if this is the problem. An initial test i do is to have the car drive away from you at full throttle, if you can hear the normal rap or pulse of the engine its probably not plugged. If it sounds like a snake hissing away its probably plugged. The exception is late 70's fords they all sounded plugged. The other things are cap and rotor (very likely but they should have been changed with the wires) if this equiped with a distributor, and pattern comming from the injector. If you have a sensitive enough timing light it will sense the injector pulse and show you the pattern. My snap-on will. Anything other than a nice even cone of sprayed fuel is bad. Good Luck |
RV and bus conversion info since 1996.
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