idle adjustment

[insomniac391]

is there an easy way to adjust idle speed?

[Archangel]

well what are you working on?

[insomniac391]

well what are you working on?

the Lincoln is idling to low, either that or missing at low RPMs. Its hard to tell because the engine is so quiet. It idles so low it wont even push itself forward on flat ground, and stalls on occasion, even in park or neutral. Theres a very slight shake accompanying it, but its so subtle its not like any other car ive had miss. I drove it home from PA fine in the day when it was warmer, but when it got dark and cold it started stalling, it starts right back up and drives perfectly, it just dies sometimes. It has barely been in storage for 10 years and just came out this year and has barely been driven it that helps.

[85MercPark]

Please read....

http://www.grandmarq.net/vb/showthread.php?t=33362

[insomniac391]

Adjusting Idle

Is there an easy way to adjust idle speed. I was thinking there was a way to make it so my throttle is pulled back just a hair, but I'm sure myself. My 351 Lincoln is havin issues at idle, It doesnt feel like a misfire, it just seems like its idling to low to maintain itself so i usually have to keep my foot just a hair on the gas to keep it going. It has been in storage for 10 years and just came out this year, but was still just left sitting 99% of the time.

[Lincolnmania]

should be an idle speed screw on the carb near the linkage

[Lincolnmania]

maybe this will help you

http://images.google.com/imgres?imgurl=http://www.tekatlarge.com/Automobiles/images/2150_topv_01.jpg&imgrefurl=http://www.tekatlarge.com/Automobiles/Carburetor/Motorcraft%25202150%2520Carb1.html&usg=__8eyvL44_ocvL4CWPHaXjy_UPoSo=&h=480&w=640&sz=95&hl=en&start=1&sig2=q9jjxyuTWqEEx2GfobgOFw&um=1&tbnid=VPlT9xq0Ifc9TM:&tbnh=103&tbnw=137&prev=/images%3Fq%3Dmotorcraft%2B2150%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26hs%3DelC%26um%3D1&ei=a-xiS4GOINealAfX1KSHBA

[insomniac391]

should be an idle speed screw on the carb near the linkage

lol i figured it out, my dad thinks the fuel mixture is to rich so he told me theres a screw on the carb that decreases the air/fuel mixture. I read that link you sent me and I'm still not sure what i need to adjust to change the mixture.

[gadget73]

Need to figure out if the choke is working right first. Does it idle high when you first start it, then come down, or does it idle really low all the time? If it doesn't idle up when cold, the choke system isn't working. Quite probably its gummed up from sitting. Usually a washdown with carb cleaner and manually working the linkages will make it go.

If you read over those pages, it shows the choke system and how it works. You'd be looking at the hockey puck on the side of the carb. High idle screw should be on that side, regular idle screw on the driver's side. Fuel mixture screws are on the front side of the carb all the way at the baseplate. I wouldn't mess with those before being sure the choke works right. If its been sitting 10 years and the carb has not been rebuilt, you may want to do that. Chances are its either half clogged with varnish, or the accelerator pump is dried out and not working properly anyway. Torn accel pump diaphragm or a sticky float will make it run rich too.


**threads also merged**

[insomniac391]

Need to figure out if the choke is working right first. Does it idle high when you first start it, then come down, or does it idle really low all the time? If it doesn't idle up when cold, the choke system isn't working. Quite probably its gummed up from sitting. Usually a washdown with carb cleaner and manually working the linkages will make it go.

If you read over those pages, it shows the choke system and how it works. You'd be looking at the hockey puck on the side of the carb. High idle screw should be on that side, regular idle screw on the driver's side. Fuel mixture screws are on the front side of the carb all the way at the baseplate. I wouldn't mess with those before being sure the choke works right. If its been sitting 10 years and the carb has not been rebuilt, you may want to do that. Chances are its either half clogged with varnish, or the accelerator pump is dried out and not working properly anyway. Torn accel pump diaphragm or a sticky float will make it run rich too.


**threads also merged**

when it first starts and idles high until it warms up than drops very low, so low my brakes and steering stiffen if I'm not pushing the gas. The Carb was rebuilt in 07.

[gadget73]

ok so the choke works then. You'll need to tweak on the regular idle screw, which you should find on the driver's side of the carb, somewhere mixed in with the linkages. If yours has the plunger thingamabobby, the idle screw is the long screw that moves the whole plunger giggy around. I think its a 5.5 mm or 3/16" socket.

[1990LTD]

How about efi? I don't have any problems with mine, just curious as to how it works. What is normal warmed up idle speed? Does it vary from car to car or what?

[torquelover]

Might want to see what happens to your idle when the A/C is turned on. Might as well adjust that, too, while you're in there.

[gadget73]

How about efi? I don't have any problems with mine, just curious as to how it works. What is normal warmed up idle speed? Does it vary from car to car or what?

the IAC controls that, and its controlled by the ecm. Target idle is I believe 672 rpm, but it varies a bit depending on conditions. Cold is higher, with the AC is higher, overheated is higher, etc.

[91waggin]

How about efi? I don't have any problems with mine, just curious as to how it works. What is normal warmed up idle speed? Does it vary from car to car or what?

Don't jack threads, mang. If you've got a question, start your own thread, or continue one of your old threads. This is insomniac's thread about his question and his car.

Discussions on this website are a lot easier to follow when each topic has its own thread, even if there are a lot of active threads at the same time. Plus, it makes searching easier later.