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.

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

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.


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.

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