Sometimes a motor is more sensitive to warm conditions. When the water temperature sensor does not cool off it keeps the engine in a warm run mode which is very lean. This is how lower emissions and better fuel economy are made.
The "cold start sequence" makes a richer fuel mix for starting and running. I have not seen a dividing point where this switches from one mode to the other. IF it is say 180 water temperature degrees and your car stays above 180 degrees turned off after running, then the fuel mix will be very lean until the engine coolant loses heat.
About all you can do is put in a new thermostat of proper temperature or a lower temperature thermostat. You could flush the radiator and back flush the block so that heat loss is more efficient. You could put in a new water temperature sensor. You want to get rid of calcium-fication of the internal surface areas so the components are more like factory new.
SOURCE: 1992 Ford Ranger 2.3L 4cyl. 5-speed
what you realy need to do is check your fuel pressure. it sound like a fuel pressure regulator . but ive also seen a dirty fuel system and defective fuel pumps do the same thing.
SOURCE: truck starts, dies. truck runs good some days,bad the next
I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!
SOURCE: 1999 Ford Taurus mechanical problem
Hello,
your problem appears to be the idle control motor located on the air intake manifold it is a small motor that goes bad quite often. Other items that can cause this is a bad /clogged air filter or a tune up (spark plugs and wires), or clogged fuel injectors. to clean the injectors you can buy a container of fuel system cleaner and pour it into the gas tank and as you drive it cleans the system.
Once the fuel system is cleaned via a tankful of cleaner & gas then the idle controller motor would be next on the list to be replaced.
Good Luck !
Rich Lilja
SOURCE: 91 F150 runs rough at low idle
If you put a scanner on it and you have no misfire codes I would be looking at either an egr valve stuck open a little or a bad Idle Air Control Valve
SOURCE: P1401
egr no try a dpfe sensor ford has a lot of this problem it has to hoses coming off the ehxhaust to a sensor that has a plug on it buy one then look for yours dont cry when you see the part it is small an costs about 85 dollars this may not be the problem but 90% of the ones that have p1401 are this problem oh yea check the hoses also dont forget replace the part then disconect the battery to reset the code /turn the check engine light off
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