Mising under load and at idle, replaced coilpack, plugs and leads, swaped injector rail from another puma and problem still there.
Ford say to repace plugs and leads at same time and use silicone grease on out side of plug, waiting on new leads to arive.
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Re: Ford Puma 1.7. Misfire
If the engine is misfiring then the cylinder doing the misfire if irt is only one that is will be easy to read...
As you pull each plug examine it. compare them to eachouter as you do this...
The plug that skips will be wet or more blackened from carbon build up.
Now you know with one. First check toat plug wire and also examine the supressor, that is the part that keeps the wire connection to the plug. Look under the garmets or the rubber insultors on this unit. see if ther is any pothole burn marks. These thing should be part of the ignition wire when you changed the set. Another is to check the compression. With the gauge connection replacing the sparkplug ...At full trottle crank the engine using the ignition key sound like about 4 times.
The gauge should read over 110 if this number is less reset the gauge and do it again a couple of times to make sure. Now doing it over and over still gets you a lower reading then that cylinder piston or valves is not sealing properly letting air escape on the compression stroke reducing the combustion ration and getting a bad burn making the engine skip. I had this happen to me and all it was was a bad suppressor a new, wire set worked.
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What you will need:-
1.Phillips Screw Driver
2.Depending on what stereo system you have, stereo removal keys.
REMOVAL AND INSTALLATION
Climate Control Assembly/heater control unit/
Removal 1. Standard preparatory measures
Make a note of the radio keycode.
Make a note of the preset radio stations. CAUTION: Disconnect the battery negative lead. 2. Remove the radio. 3. Note:The control unit for the heating/air conditioning system, all operating knobs and the air distribution operating switch make up one assembly.
Remove the bezel/control unit.
1 Remove the screws on the top of the unit
2 Unclip the clips either side of the unit
Pull the bezel/unit forwards.
Disconnect the plug. 4. Unclip the air distribution shaft. 5. Remove the heater/air conditioning module and the fan operating switch.
Installation 1. Refit the components in the reverse order. 2. Install the radio. 3. Connect the battery ground lead.
Enter the radio keycode.
Reprogramme the preset radio stations.
Reset the clock.
Carry out a road test to enable the PCM to collect data. 4. Check that the heater/air conditioning operates properly.
let me get this right ? YOU ARE FIXING THE PROBLEM FOR A SHORT PERIODS OF TIME ? SO ONE WOULD GET FROM THAT YOUHAVE THE SOLUTION . Something is allowing your solution to be changed . SO SOMETHING IS LOOSE ? YOU HAVE TO FIND WHAT THAT IS AND PRESTO !
you will need to find out why, is it bad spark plug wires or a vacuum leak or injector problems, start by checking the spark plugs and wire first, replace them or swap with another cylinder to see if the misfiire move to the cylinder you swaped with and if it does then you know its a wire or plug, i would start there and if it has been a while since a tune up then i would just install new spark plugs and wire set.
Try a compression test. You could have a bent valve or a bad ring on the piston. If the compression test shows it to be much lower than the other cylinders then its a mechanical problem. The valve may not be seating or a weak spring isn't allowing the valves to close and its leaking under load.
It's not so much a random misfire when it's always the same cylinder.
If you did not have this problem before you changed the "tower", you might want to remove it, look at it to make sure everything looks like how it should, reconnect it and make sure it connects to the spark plug. If you have a coilpack, try swapping with another coilpack if possible.
If you havent replaced the sparkplug, try doing so to see if its that simple.
If you've had this problem going on before you changed the tower (not sure what you mean by that exactly), then it might be something else. It could be a fuel injector. There's a few ways to test it, one is to disconnect the electrical plug and see if it makes a difference (while running). No difference = bad injector or no spark. Be sure to check that you have a spark before you check the injector to help isolate the problem.
You could try swaping the #4 injector with another and see if you can cause a different cylinder to miss. If it does, that's your culpret.