trouble shooting
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Originally Posted by jbrew
What kind of plugs where in it before you changed them and what are you using now. How long has it been running like this ? How many miles do you have in total?
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From: MI
Originally Posted by joshmac4.6
I'm a Ford tech and i'm pretty sure i Know what i'm talking about. Why do you think the coil is numbered 123 465, and not in order. The system does work like that, the coil towers across from each other are the paired cylinders in the coil.
You better go back to school - I have a 98 4.2L AND a 5.4L , you can have a dead spot in the coil windings. That's pretty much how they go out..
Don't listen to this poster.
I hope you don't work at a Ford dealership!!
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From: MI
Originally Posted by jdog12
115k it was running ok but still a miss. but now it just got worse when i changed the plugs i had autolites now i have autolite platinums
Yea, Autolite doesn't make plugs for these motors - You need to run Motorcraft, NGK or Denso's or you'll have nothing but problems..
Last edited by jbrew; Feb 22, 2008 at 03:11 PM.
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From: Western NC
Originally Posted by jbrew
You better go back to school - I have a 98 4.2L AND a 5.4L , you can have a dead spot in the coil windings. That's pretty much how they go out..
Don't listen to this poster.
I hope you don't work at a Ford dealership!!
Don't listen to this poster.
I hope you don't work at a Ford dealership!!
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
Likes: 19
From: MI
Originally Posted by joshmac4.6
You can have a dead spot, and when you do it usually kills two cylinders, ALL Ford EDIS ignitions except coil on plug are waste spark. That is why it is so important to use double platnium plugs, one plug fires normally and the other fire backwards. I suggested he had a vacuum leak due to possible intake gasket problems the trucks had in earlier model years.
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From: Western NC
The coil pack has 3 coils inside, two cylinders per coil. Cylinders 1&5, 2&6, 3&4 share a coil and share a coil. If 5 and 6 are dead then cylinders 1 and 2 would likely fail as well, thus equaling 4 cylinders failing.
Last edited by joshmac4.6; Feb 23, 2008 at 12:28 AM.
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From: MI
Well, I would put the right plugs in it and go from there. I tried Autolites once and they lasted about 40 miles. Honeywell , who makes Autolites and Motorcraft wouldn't refund my money because it was my fault for not purchasing the OEM plugs they manufacture for Ford motors. Hell, the Auto supplier told me they where the same as Motorcraft back them. I listened to the wrong people. They are not the same and don't work very well in these motors..
Last edited by jbrew; Feb 22, 2008 at 08:40 PM.
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Originally Posted by jbrew
He's referring to your Idle Air Control (IAC) valve. That's just a cold start valve and does not effect ignition/cylinder firing. Just throw an old plug in those wires and fire it up. Ground the plugs out and they should spark. You can connect a wire to each plug with an alligator clip and ground them out on that stud in front of the motor - heres a pic of the stud -
With the truck running and old plugs inserted into #5 and 6 wires then grounded in that location you should clearly be able to see spark generating @ the plug electrodes. If not , it's the coil. If you do see spark , then you have internal problems..
With the truck running and old plugs inserted into #5 and 6 wires then grounded in that location you should clearly be able to see spark generating @ the plug electrodes. If not , it's the coil. If you do see spark , then you have internal problems..
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From: Western NC
Originally Posted by jdog12
ok i took it to the shop and they said it sounds like a fuel pump or a intake leak but someone told me that my new wires could be bad but i dont think so because it was missing a lot befor i did anything to it but it was drivable but as soon as i put my new wires on it just start missing way worse than it di befor.