Hello John, do you really adjust the mixture by feel alone?? If the answer is 'yes' then I say that no wonder so many DeLoreans start and run poorly and have no power. You cannot do that by feel! You are right saying that a little bit goes a long way.. and if you would do it like it should be done by using a gas analyzer you'd know that 1/8 of an inch might take you from one limit to the other limit of the lambda circuit... meaning that it might take you from too lean for the lambda to work properly to too rich or vice versa. The frequency valve will still be buzzing all the time but it will be in the fixed "limp-home" mode running at 50% duty. All that means that the car will still run but it will be harder to start, might hesitate, will not develop full power and might use more gas. This is especially true for harsh weather - hot, cold, wet. My car starts every time in less than a second even after sitting for two months untouched... and regardles of weather or temperature! The ONLY way to properly set the mixture is by using a gas analyzer connected to the exhaust ports upstream of the catalytic converter. Another method, although not as good, that might still work is it to replace the O2 sensor and set the mixture using a dwell meter connected to the frequency valve. In this case you need to set the mixture to the point where the dwell meter reads about 50% of the full swing at idle(note: not 50 on the scale, but 50% of the full swing regardless what numbers are printed on the dial). Plus you need to get it to a point where the dwell goes up and down and the reading is NOT steady 50%. It usually goes from 45 to 55%. If you get a steady reading that means you are outside the range of the lambda circuit and the mixture is not controlled by the ECU. When adjusting it the way it should be done you will see that sometimes just 'pressure' on the wrench might be enough to get it up or down by 10%. If you turn it by 1/8" you'll run out of the lambda range. DO NOT DO IT BY FEEL!!!! Do it right Tom Niemczewski vin 6149 (in Poland!) Google earth: 52°25'17.30"N 21° 1'58.00"E tomciodmc@xxxxxxxxxxxxxx www.deloreana.com ----- Original Message ----- > Ed, Be sure when your adjusting the fuel mixture screw that a little bit > goes a long way. What I do is insert the 3mm long handle wrench into the > hole with the handle pointing at the 12Oclock position then make the small > adjustments left for lean or clock to enrich, just do it in 1/8" steps. > The frequency valve should buzz all the time. What it's doing is allowing > fuel to return to the tank as told by the Lambda system. > John Hervey > www.specialtauto.com To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/