BMW 2002 FAQ - 74tii- which way to turn screw for richness

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Thread Topic: 74tii- which way to turn screw for richness

Date: 7-6-08 11:03
From: eaker02 in Rome,Ga

Subject: 74tii- which way to turn screw for richness

74tii - since I had the head had been re-built and have a different throttle body, KF pump, went back back through and set the baseline setup.
Was getting bas gas smoke, found the warm up regulator enrichment lever had about a 5 or 6mm opening between it and the screw, got it back close to 2.6mm, no more smoke on idle, just a little on punching the gas. (not sure whether to close the regulator up a little more)

Now the problem, idles fine cold, when it starts warming up and as the regulator is expanding, start getting a little surge on idle which right now 900-1300 rpms. (surges about 400 rpms)
After reading archives, was reading about the mixture screw inside the tuna can and that surge may be due a lean condition after warmup. Do I screw the little screw in or out to richen to see if that helps with the surge?
thanks
Ron

Date: 7-6-08 11:16 From: jgerock in Alexandria, VA Subject: Re: 74tii- which way to turn screw for richness
According to the BMW tii injection manual (edited version I have from the registry): "Adjust CO by turning the mixture screw OUT to raise the CO, or IN to lower it". See page 15 of this helpful manual. Good luck - hope you can get it running correctly without the surging. _________________ Jim Gerock BMWCCA # 381868 73tii "Celeste" # 2764081 71 VW Cal-look Bug

Date: 7-6-08 12:37 From: eaker02 in Rome,Ga Subject: Re: 74tii- which way to turn screw for richness
Thanks, the manual is what I'm going by to set everything, are you making it run richer by raising or lower the CO? Even the though manual shows a 71-73 model tuna can , I have the little screw set by what the book says, which is just verily touching the cam. ron

Date: 7-6-08 07:05 From: tjones02 in Vacaville, CA Subject: high CO = rich... (nt)
(nt) _________________ Tom Jones BMWCCA Life 49246 Vacaville CA a Wrench @ http://www.ipb-autosport.com/ & http://www.caseymotorsports.com 67 1600-2 Granada + 3 more 1600-2's 67 1800A stored 76 2002 F/S soon 86 528e 5sp Mine 369k 86 528eA Wife's 90 CRX HF 50mpg!

Date: 7-6-08 08:10 From: peteinjp in Toyama, Japan Subject: Re: 74tii- which way to turn screw for richness
My dad was born in Rome Ga. Anyhow to make it rich you want to close the throttle a bit. If you look at the whole deal and push the gas pedal you can see which way is open and which is closed. Be sure the timing is dead on first though because too much advance can also cause this problem.

Date: 7-6-08 09:16 From: dubois in Hollister, (near SJ) California Subject: Re: 74tii- which way to turn screw for richness
screw it in to rich it - screw it out to lean it. Keep a note book, it only takes about a quarter of turn to fix things. _________________ 72 tii A4 Don't argue with anyone that will not consider the possibility of being wrong... the future is a dream, the present infinitesimally brief, but the memories are forever...

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