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Ford focus 2003 zx3 still cuts out at idle does't stall and the check engine light is off

I have posted before and the check engine light has not come back on so what do you think i should check.Can it be scanned still with the light off.It really sounds like a misfire but not sure I put new plugs in it a while back.So if anybody could give me a logical theory I would appreciate it.

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  • 37 Answers

Check out your throttle position sensor voltages w a scan tool , engine off key on, compare to specs given in auto repair manual for your car. Voltages should change smoothly in the specified range, if voltage takes a sudden jump or experiences a zero reading anywhere then the problem is the tps. When is the last time your fuel filter was changed ? Some of these are not replaceable without removing the fuel pump in the tank. When you put in the plugs did you also replace the wires? P.S an intermittent tps won't always leave a trouble code in the computer. Also clean out the throttle body and idle air control unit with an approved spray cleaner and a rag with engine off and key off. Have someone hold the throttle pedal to the floor to make this job easier. After cleaning hold gas pedal to the floor and start up then when engine starts, rev engine half way a couple of times to remove any excess carbon from the system then let engine idle. This should be done once every 6 months whether having idling problems or not, just to avoid having them. If the throttle body is dirty it can and will cause a stumble comparable to a miss.

Posted on Apr 18, 2013

  • Doris Sharp-randall Apr 21, 2013

    what does tps stand for the other thing is it is coil on plugs I don't think it has a throttle body I will check

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SOURCE: 2003 toyota avalon gets check engine light and goes when idleing

Take the car to a local Auto Parts Retailer, and have them check the fault codes on your on-board computer. Given the year of your car, it is probably an OBD-2 type computer. They can print out whatever the computer diagnostic says the problem is. I am going to guess the throttle position sensor is to blame since it sounds just like what my sister's Mazda Mommyvan was doing.

Posted on Feb 22, 2009

  • 3 Answers

SOURCE: I have 2003 ford focus 2.0 SOHC SPI with a bad missfire

Have you checked your cam or crank sensors? Could be one of them.

Posted on Jan 06, 2013

SOURCE: This is a follow up question on my 2003 ford focus zx3 2.3 litre it cuts out when idles does not stall and the check engine light goes on for a while then will go off my question is can I still retrie

You can use a Code Reader or Professional Scan Tool
any time you want to

You connect under the dash & turn the key to the on position
Motor doesn't have to run

Your checking to see if any data is stored or present in the
PCM

If the check light flashed or stayed on & did it several times,
you should have codes

Then only issue will be if they are Enhanced Codes,then the code
reader won't retrieve them

What you need to keep in mind & no one understands, is that
codes do not tell you what is wrong or tell you to replace any
parts

The codes along with trouble charts,knowledge,experience,etc
are use to conduct testing of the system with the fault codes

Posted on Mar 29, 2013

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This is a follow up question on my 2003 ford focus zx3 2.3 litre it cuts out when idles does not stall and the check engine light goes on for a while then will go off my question is can I still retrieve a...


You can use a Code Reader or Professional Scan Tool
any time you want to

You connect under the dash & turn the key to the on position
Motor doesn't have to run

Your checking to see if any data is stored or present in the
PCM

If the check light flashed or stayed on & did it several times,
you should have codes

Then only issue will be if they are Enhanced Codes,then the code
reader won't retrieve them

What you need to keep in mind & no one understands, is that
codes do not tell you what is wrong or tell you to replace any
parts

The codes along with trouble charts,knowledge,experience,etc
are use to conduct testing of the system with the fault codes

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1 Answer

I have a 2003 ford focus zx3 2.3 litre when it idle's the motor cuts out,but when you give it rpm's it smooth's out what do you think it is?


I don't think anything until I have the car & check a few
things to see what it is doing

What I find that does work as it should & what data & operating conditions I don't like & need to find a resolution for, then starts
a testing procedure or component testing

What I'm saying is you can't guess just to make you feel good
here on the internet

There are no details on this question or any test results you or a shop has done,you may have posted the question several times I don't know

We pick & choose to answered whatever we want or not answer at all

Just a social web site or chat room as your using it

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