mixture?

k9handler · 06-21-2002, 08:38 AM

ok, I have done just about all I can based on my capabilities. The car is running very well... but very hot as well so maybe the mixture adjustment will help cool it off a bit. How much should I expect to pay to have my mixture and timing properly set?

Targa77 · Targa77's Garage

Do it yourself. All you need is a timing light and a gas analyzer. Since you have a CIS system like me, it's best if you learn how to work on it yourself. This way, you'll learn a lot more about your car. If you insist on having these checked by someone else, then I would guess an hour labor to check both.

Superman · 06-21-2002, 08:56 AM

It took John Walker about ten minutes, max, to perform those two tasks on my car a few weeks ago. Still, I'd agree that the best way would be to get the tools and make this a regular maintenance task by the car's owner/lover.

k9handler · 06-21-2002, 09:05 AM

Is the settings/instructions pretty simple? Will this make it run cooler?

davis911s · davis911s's Garage

I say it is a DIY job too. As long as you have a timing light and the gas analyzer.
Here is a link to my post doing the exact same thing: Timing, idle messed up. HELP! Longish

I won't be able to access my friends gas analyzer until tommorow, but the timing was easy.....once I got a better answer on what to set it at. My sticker said 15 Deg ATDC, I set it to 35Deg at full advance as per John Walkers suggestion.

I'll keep it posted on how mine turns out after the gas analyzer is used.

Shawn

k9handler · 06-21-2002, 09:56 AM

Thanks Shawn...seems we are both in the same boat! I must say this all seems a bit above my head, TDC I understand and I have the car at 1000 rpm idle. What is the 35 or 15 advance and how is this done? Is it just rotating the distributor?

Sunroof · 06-21-2002, 10:12 AM

I have been through this exercise many times. Real simple......go buy a 3mm allen wrench, preferably with the "T" handle. Make sure the height is right or you will have a tough time getting the wrench in between the mixture hole and sound insulation pad.

I asked my mechanic about a CO anlayzer and his 30+ years of experience came simply to this.............."you really do not need it if you play around with the adjustment til its perfect for the car".

The engine would idle up and down after a run on the highway. I did everything aside from that adjusting the mixture! I started a turn here, turn back there until to me its seemed to be perfect and everything balanced. The code is.....
RIGHT TO RICH...............LEFT TO LEAN........a click at a time.

I had some gunk in my mixture screw area so what I had to do (if yours does not turn well) is simply take the air filter cover off and hold the sensor plate arm up while applying pressure with the mixture tool for a slight adjustment. Engine off of course! It took a few attempts but all is great at this point.

Perhaps for many mechanics after years of adjusting the CIS units, it became more of a feel than an instrument measurement.
It was certainly that way with my old Triumph and Austin Healy carbs. I would hold off on the purchase and try to tweek it out yourself. Worse case is you can go to one of those emission testing centers, have them stick the pipe in the exhaust and give you a reading before you begin adjustment.

Regards
Bob
1973.5 T "home of the first CIS"

k9handler · 06-21-2002, 12:48 PM

Bob you make it sound simple...so I might give it a try and if I fail then of couse I will take it to my Mech. How does the adjustment screw on the CIS by the throttle link apply to this?