[Sunroof]

I drive a 1973.5T, first with CIS which they should have ended that year!!!! I believe I have tinkered with the mixture setting and idle screw to a point where it still runs a bit rough and I could be on blend when I should be on puree!

I do not possess a CO meter so I have to start from scratch with the help of you wonderful folks. I was told once that the mixture setting is in the sweet spot when the idle needle on the tachometer hits bottom and bounces back to the correct tack setting (8-10 rpm). Its that bounce back!

A bit of background: I picked my car up recently from a shop that rebuilt my top end (valve job, new nikilsil cylinders/piston set), clutch, suspension bushings and a few more small things. Compression went from 7 to 8 with the nikkies and horsepower increased. I did not instruct them to rip the whole CIS system apart; however, they did a fuel pressure test and it was on the numbers, cleaned and lubed the distributor cap and new plugs.

Driving home after I picked up the car I was noticing a slight bump or hesitation at mid range, however, the car felt more powerful and idled well. No backfire, just a slight hesitation at speed. When I got home I started to tinker with the mixture setting. I took the car out for an errand yesterday and some of that was on the interstate. The car ran great, with no hesitation at speed, however, once I hit the exit it went back to the hesitation in the midrange. No backfire, but was rougher. I even stopped to fill up with 93 octane thinking that would help.

So this morning, I inserted the 3mm adjustment tool and went CRAZY trying to get this settled. This goes for the idle screw too.

Without trying to troubleshoot anything else (I was suspicious of the fuel filter, but they said they changed that out), I gave it a try and even at idle I get the hesitation now.

What is the best way to reset the mixture from scratch assuming I turn the wrench to the left (left -lean, right-rich) until it stops and work toward rich. Quarter turn at a time to rich?

How do you manually set a CIS mixture without a meter? and idle screw? Some of you CIS old timers know the secrets. Or am I dealing with another issue?


Thanks

Bob
1973.5T