Mechanics

F150 DTC

2006 Ford F-150

Engine Performance problem
2006 Ford F150 V8 Four Wheel Drive Automatic 75000 miles

2006 f150 shows misfire #5 cyl changed out coil and plug no change. There is poping noise and chk eng light flashes when under accelaration
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Wlj
March 10, 2009.



Ok it could be a fuel injector. So what I need to know is if you have a digital multi meter and what engine is in your F-150 and is it 4x4 and is it a flex fuel truck? Get back to me and we will test the injector to see if it is bad ok.

Racefan966
Mar 10, 2009.
Yes it is a flex fuel and I do have a tester and it's a 4x4

Tiny
Wlj
Mar 10, 2009.
Ok what engine it in it 4.6 ltr or 5.4 ltr or what? Get back to me with that I will look up the restence valure for it.

Racefan966
Mar 10, 2009.
5.4

Tiny
Wlj
Mar 10, 2009.
Ok first unplug the injector and then check the ohms across the injector terms. You should see around 1200 or so. If you like you can check the resistance of the injector next to it and that will give you the base value. It is giving the value of the non flex fuel injecto so that is what I have to go by. If your ohms is lower by alot or infinet then the injector if the problem. Hope this helps. Get back to me with what you find.
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Racefan966
Mar 10, 2009.
Was not the problem injector had 13.9

Tiny
Wlj
Mar 10, 2009.
Ok if you have a good coil and good coil on boot and the plug it good and gaped right and the injector ohm's out right it is only two things left to believe. The injector is pluged or the compression is low in that cylinder. Have you tryied an injector cleaner like seafoam or something? Have done a compression test?

Racefan966
Mar 12, 2009.

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