i have a 2002 ford focus zx5 manual drive with 93000 miles. last week the battery light started flashing when i would gear down into second to come to stop. Then this week the car is cutting completely off when i brake or shift down into second. Doesnt do it all the time, usually after i have been driving for 30 miles or so. took it to ford place, no codes came up and they dont know what is wrong with it. i had my fuel filter replaced and new plugs and wires, and still doing the same thing--cutting off. anyone have any suggestions since ford doesnt. car cranks right up after it cuts off. thanks
ford focus cutting off when i slow down! on 2002 Ford Focus
Its hard to say your engine has computer controlled idle so perhaps that idle speed control valve is failing, the computer sees it is trying to control it and perhaps sees that it is trying to control it and assumes it is OK and therefore doesn't set a code. You've covered the other basics by replacing the plugs and fuel filter I wonder do you have any vacuum leaks but threat should show up in fuel trim figures on the scan tool.
definetly check for vacuum leaks, alot of times you will get a code of PO171 bank lean with major leaks but a good place to start it the air filter makes sure its clean, follow back to the ass Air Flow sensor making sure the claps on it are nice and snug after that there is a hose that dives off to the throttle body and were it plugs onto the throttle body there is a rubber elbow that gets fragile and often fails, check EGR lines, basically just check all lines, if you spray a little carb cleaner arond and you hear the engine idle down and smooth off you have located a problem area, good luck
its not cause your slowing down its a ground issue all the focuses are having similar issues ford cheaped out and went with a shitty ground and never cleaned up the paint under the contact in the wheel well and the ground design is crap replace your ground off the battery the terminals and ground wire iz junk