Originally Posted by Edward Wyatt

With CIS, the first step in diagnosing a running problem is a fuel pressure test.

Most people don't have fuel pressure gauges, so let's look at the situation.I bought a fuel pressure test kit specifically to help with this car, and input pressure is 5.8 bar. Until not long ago I didn't know where to check lower chamber pressure, so I will get that when I get a chance.

First, I wouldn't go messing with the EHA, I worked on these cars when they were still new and we never touched it. Agreed

Second, make sure the secondary ignition system is in good shape before doing anything else. Pay particular attention to the rotor button, and check the ohm resistance of the plug wires against specs. Some aftermarket sparkplugs are notorious for causing running problems, and I would make sure you have a good set of plain old copper core spark plugs. NGK makes an excellent copper core spark plug, just make sure you avoid any fancy platinum tipped aftermarket junk.

I would, at the very least, set a baseline and throw a new set of copper core plugs in it first. Currently there are some Bosch +4 platinums, which I doubt are very good, but I also would't think they could make the car run as bad as it is right now. If they really were a huge issue, I could switch to a set of resistor-less NGK plugs I have. Also by the fact that when the car was running, if I pushed on the air meter at the same time I pulled the throttle linkage, I could get the engine to respond quite quickly and without bogging. I'm very convinced the ignition system isn't causing any "big enough" issues at the moment.


Third, when adjusting the mixture at the fuel distributer always remove the 3mm allen key between adjusments and realize the a tiny movement goes a long way so to speak. This adjusts fuel mixture across the board, more than half a turn indicates a more serious issue that needs to be addressed before the mixture can be set. Faulty secondary ignition comes to mind. Counter clockwise movement leans out the mixture, and clockwise movement richens the mixture.

I would at least use a vacuum gauge and try to set the mixture for the highest reading if you don't have access to a CO meter.



The fact that it starts and idles ok makes me think the problem might be ignition related. Or a plugged cat, if it has one. A vacuum gauge will point you in the right direction.Actually, as of the other day when I tried to do some more diagnostics, the car doesn't start up anymore. I'm baffled as to what I've even changed since last time.