ignition problem
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Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Lets see if we can think this through. You may have more than one problem, so did the old coilpack test bad, or did you just replace it on a huntch????
You can test the primary & secondary windings resistance, to see if any are open circuit. If thats ok, most autoparts stores can bench check the coilpack for electrical output at no cost. If the old ones output voltage checks ok, you have a known good spare. Just in case Murphys Law is messing with you, you did have the new coilpack bench tested before leaving the store with it.....right?????
Do you have a CEL lit, if so, scan the computer for trouble codes & post All code Numbers, as they can offer up good trouble shooting clues.
Which two plug wires don't seem to have spark???? If they are on the same coilpack winding, check to see if that winding is getting B+ at KOEO & that the computer is ground switching that coil packs primary.
Did this problem come about after some event????
Give us some more clues & maybe the forum can make a more focused guess.
You can test the primary & secondary windings resistance, to see if any are open circuit. If thats ok, most autoparts stores can bench check the coilpack for electrical output at no cost. If the old ones output voltage checks ok, you have a known good spare. Just in case Murphys Law is messing with you, you did have the new coilpack bench tested before leaving the store with it.....right?????
Do you have a CEL lit, if so, scan the computer for trouble codes & post All code Numbers, as they can offer up good trouble shooting clues.
Which two plug wires don't seem to have spark???? If they are on the same coilpack winding, check to see if that winding is getting B+ at KOEO & that the computer is ground switching that coil packs primary.
Did this problem come about after some event????
Give us some more clues & maybe the forum can make a more focused guess.
Thread Starter
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Freshman User
Joined: Feb 2004
Posts: 25
Likes: 0
From: MEMPHIS
store said they couldn'test the coil pack so bought a new one same problem two wires on secendary coil pack not firing. someone else just told me it ould be dis module but a previous auto store tested it good.this truck has not run good since motoer rebuid]ld and just now replaced a crcked head
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
You can test the coilpack primary & secondary windings for continuity, with your multimeter.
Again, which coilpack windings are without spark????
If the trigger module were bad, you wouldn't have any spark output from the coilpacks.
You could swap coilpacks & see if the problem follows the coilpack, if it doesn't, again check the troubled coilpack electrical connector contacts for B+ at KOEO for the troubled winding. If you have B+ at KOEO, then look for a wiring problem back to the ECM, or an ECM ground switching driver problem for that coilpacks winding.
Again, did this problem come about after some "event"????
More thoughts for consideration, keep us posted on your trouble shoot.
Again, which coilpack windings are without spark????
If the trigger module were bad, you wouldn't have any spark output from the coilpacks.
You could swap coilpacks & see if the problem follows the coilpack, if it doesn't, again check the troubled coilpack electrical connector contacts for B+ at KOEO for the troubled winding. If you have B+ at KOEO, then look for a wiring problem back to the ECM, or an ECM ground switching driver problem for that coilpacks winding.
Again, did this problem come about after some "event"????
More thoughts for consideration, keep us posted on your trouble shoot.
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Mary Smith Harner
1983 - 2012 Ranger & B-Series
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