My 2003 Ford Focus is hesitating severely at all speeds and at idle. Emmissions light has been on for a while and will start flashing a bit then remain steady, does that the whole time. We have changed spark plugs, ignition coil, one O2 sensor, cleaned maf sensor, and did check on dpfe sensor. I am completely confused. Please help.
Change the plugs and the rotor insode the distributor. Sounds like your focus has either a hole in the Rotor Button, a cracked rotor button or the plugs need to be changed. Anotehr thing that would make your focus stall, **** and generally be a pain in the **** is: Fuel injectors out of hole; bad fuel injector; bad gasoline; Air filters need changing.
Those are basically some of the things that cause the Focus to jump and ****.
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This can be caused by a defective Maf sensor and coolant sensor, they will not trigger a code because as long as there is a signal the computer doesn't know the actual engine running condition enough to say the signal from the 2 sensors is wrong, this goes double for MAF sensors, another area is the idle speed control motor.. I want you to read about the problem at the link below.
Hello! #1...I need to know if the Check engine Light is on...If it is, take the vehicle to an Auto Zone or Advanced Auto (any auto parts store) and they, for free will read the code/codes...send the trouble codes to me and I'll fix your Focus...#2 tell me which engine is in the car; give me the sub model ie...SE, ZTS....etc...If there isn't a CEL tell me....Guru...Saailer
There are several things that can cause your cruise control to not function. Anything from a bad speed sensor to a faulty speed control servo. It is impossible to tell you what is wrong without diagnosing your speed control system. Here is a quote from the vehicle manufacturer regarding this issue:
"Start by running speed control servo integrated self test diagnostics. The servo
has integrated self test diagnostics which is a key tool in quickly and
accurately diagnosing speed control system faults. Self test diagnostics are
also the basis for starting speed control trouble shooting."
Please note that a diagnostic scan tool capable of accessing the speed control data is required for performing this task.
Is this when the engine's cold? check the auto choke
when it's warm -air ingress to inlet manifold - listen for air noise - you will also notice that it will hesitate when you accelerate also check if servo vacuum is affecting the engine speed - when idling pump brakes if it is this then speed increases Air intake sensor unit Now you need to get a garage to plug into the ECU [car computer]
If you have an Autozone near you, they will scan your car for error codes for free. Try going there and have them scan your car. Once they have the code that is causing the check engine light to come on they can tell you which part the computer is detecting as causing a problem. If you found this solution helpful please rate it.