Question:
I have a 2003 Ford Focus with 70,000 miles. Recently its started to stutter a bit when I initially accelerate, from a complete stop. I've replaced the spark plugs and the fuel & air filters. Also I've used some good fuel injector cleaner additive, yet the problem still persists. What are the other things that could cause this to happen? Spark plug wires maybe? Is the fuel additive just not good enough to clean the injectors? Thanks for your help!
Answers:
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First two things to check: TPS and fuel pump output - pressure and volume. Bad news is that ford on-board computers are calibrated so that they don't set a code in case of a malfunction...O2 sensor, don't know if your car has one but mine went out on my 92 camaro and it did that. Also could be a map sensor.
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Rummy, may be correct about sensors, but a vehicle newer than 1996 should throw a check engine code for bad sensors and just about anything else that could make a car sputter.. Is the engine light on? If so, have it read by an autozone, they will do it free of charge.
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My 2001 F.F. is in the shop right now with the same problem. At first thot bad gas/moisture/plug wires/gas filter,but none of that. Worse going uphill and on rainy days. Will get back to you when I find out!(freakin' Fords!)OKAY I'M BACK.....replaced plugs,plug wires,coil pack &fuel filter...runs like new now!!Moved my car this morning. 6 hours later tried to drive it. Nothing! Any ideas what's wrong with it?
You are on the right path, always start with the basics. You have already done plugs, fuel & air filters. check your plug wires, then your induction system sensors, a sticking tps or maf sensor can also cause these problems.I am not a beliver in additives. I think you will find your problem is in the ignition or induction system of your car. If you can not isolate and resolve the problem then I suggest visiting a ford service center.
best of luck.
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Is your check engine lite on ?? if so have it checked out, usually if the lite is flashing there is a missfire.it could be a coil,wires,fuel pressure. or like you think a bad injector. good luckHelp! My 1985 S10 Chevy Blazer wont stay running!! I start my Blazer it idles rough then stalls...?
sounds like possibly spark problem // starting with replace coil // possibly spark plug wire or a plug partially broken on yhe tip or ceramic plug body brokencould be the plug wires or the mass air flow sencer or u could have some water in your fuel
sounds like a fuel pump problem considering you change the spark plugs it could also be plug wires.
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