where is the dang fuel mixture adjusting screw? [Archive]


Pirate4x4.Com > Brand Specific Tech > Toyota - Truck and 4Runner > where is the dang fuel mixture adjusting screw? PDA : where is the dang fuel mixture adjusting screw? TyTy 08-10-2002, 05:42 PM I know this is a newbie question and all but I dont have a FSM, all I have is the parts store special. All it says about adjusting the fuel mixture in my book is that it is set from the factory and there is a pin or somehting put in it and it should not be changed except for by a toyota certafied mechanic:rolleyes: Also, anything else besides idle and timing that I can adjust to make it run smoother, lemme know.:D J-Dogg 08-10-2002, 05:52 PM It faces the passenger side of the truck. Its a plug that covers the adjusting screw. I drilled a little hole and used a screwdriver to pry it out. Alabamatoy 08-10-2002, 06:18 PM Th mixture wont affect smoothness. My recommendation is dont mess with it unless you have done some mods that increase intake airflow - filtercharger, larger bore throttle body etc. The AFM is adjusted by removing the black plastic plate on top of it, and adjusting the screw one or two teeth, no more. Be sure to mark the gear in its original location - if you let it loose, you'll play hell getting adjusted back right if you dont mark it. LCE has a good technote on how to do it: http://www.lcengineering.com/TechNotes/TechNote11.htm More than a tooth or two with a stock intake system, and you are gonna cause yourself more grief than improvement. Smooth running is greatly affected by the EGR. 2stroke 08-10-2002, 06:23 PM YOUR TALKING ABOUT A CARB RIGHT? NOT EFI? patooyee 08-10-2002, 07:38 PM This is TyTy ya sorry, carb. Keep the advice coming. Bumping up the idle to about 1000K helped a lot but what happens now is it idles good for about 2 minutes than just chokes out. Also, if you rev it up, it comes down smooth and just dropps past idle and dies. This is why my brother and I thought it was too rich... patooyee 08-10-2002, 07:43 PM This is TyTy again... Im thinkin it has something to do with the fact that I used a low pressure electric fuel pump. The holes on my head were stripped for the stock fuel pump. Might be rough running cause that pump is not adjusting to engine speed like the stock mechnical pump would. I have heard of people having good results from electric pumps though so it has to solvable. thanks again 2stroke 08-10-2002, 07:46 PM i dont agree. after it stalls, is there still fuel in the carb? 2stroke 08-10-2002, 07:47 PM sounds like a vaccum leak 2stroke 08-10-2002, 07:49 PM spay a SMALL amount of carb cleaner or either in the carb wile its running. does the idle go up or down? TyTy 08-11-2002, 06:28 AM I wont have a chance to work on it untill tonight. Ill let ya know. Thanks for the interest though!