Please verify my results...
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Freshman User
Joined: Feb 2008
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From: Greensboro,North Carolina
Please verify my results...
Greetings,
I am T/S a misfire on my daughters 2003 Ranger, 3.0L. I have consistenty pulled a P0303 & 0316 code (cylinder three misfire & multiple misfire) . I switched the number three and four spark plug wires at the ignition module. Now I get a P0304 & P0316 code. This would lead me to believe the ignition module is bad since those two are fired in pairs. Correct?
Thanks in advance,
Ken
I am T/S a misfire on my daughters 2003 Ranger, 3.0L. I have consistenty pulled a P0303 & 0316 code (cylinder three misfire & multiple misfire) . I switched the number three and four spark plug wires at the ignition module. Now I get a P0304 & P0316 code. This would lead me to believe the ignition module is bad since those two are fired in pairs. Correct?
Thanks in advance,
Ken
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Kinda sounds that way. You could do an ohms check of that coil across the 3-4 plug wire terminal & compare its resistance with the other pairs reading, or have the autoparts store bench check the coilpacks output, as most have a tester & they'll do it at no cost.
If you opt for a new coilpack, have it bench tested before leaving the store with it!!!!!
Let us know how it goes.
If you opt for a new coilpack, have it bench tested before leaving the store with it!!!!!
Let us know how it goes.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,716
Likes: 0
From: Boston, MA
Greetings,
I am T/S a misfire on my daughters 2003 Ranger, 3.0L. I have consistenty pulled a P0303 & 0316 code (cylinder three misfire & multiple misfire) . I switched the number three and four spark plug wires at the ignition module. Now I get a P0304 & P0316 code. This would lead me to believe the ignition module is bad since those two are fired in pairs. Correct?
Thanks in advance,
Ken
I am T/S a misfire on my daughters 2003 Ranger, 3.0L. I have consistenty pulled a P0303 & 0316 code (cylinder three misfire & multiple misfire) . I switched the number three and four spark plug wires at the ignition module. Now I get a P0304 & P0316 code. This would lead me to believe the ignition module is bad since those two are fired in pairs. Correct?
Thanks in advance,
Ken
Kinda sounds that way. You could do an ohms check of that coil across the 3-4 plug wire terminal & compare its resistance with the other pairs reading, or have the autoparts store bench check the coilpacks output, as most have a tester & they'll do it at no cost.
If you opt for a new coilpack, have it bench tested before leaving the store with it!!!!!
Let us know how it goes.
If you opt for a new coilpack, have it bench tested before leaving the store with it!!!!!
Let us know how it goes.
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
pawpaw...me confused.......his truck does not have a separate ignition module.....I guess he is talking about the coilpack?.........pawpaw I would think that if the misfire was following the sparkplug wire then it would indicate a bad wire not necessarily bad coilpack......thoughts?
Fleet Mechanic
Joined: Feb 2007
Posts: 1,716
Likes: 0
From: Boston, MA
....I did not notice that......so he just swapped the wires only at the coil-pack(what he is calling the ICM).....I never heard of anyone T/S like that before....but if it worked for him!!!...I would think that it could cause a misfire at both cylinders since both cylinders might not be running at 100% thus causing the crank feedback to notice an rpm difference and throw a misfire code for each cylinder............He should test for secondary resistance between the #3 and #4 sockets to help confirm is DX...he wants 13k-15k ohms
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Since he only had a trouble code for the #3 cyl, not the #4 cyl, which uses the other half of that secondary winding, by switching the plug wires at the coil pack, on our waste spark ignition system that fires the plugs on every rotation of the crank shaft, he was just exchanging coil halves & reversing spark polarity to the plugs, to check the plug wires & both halves of the secondary winding.
If the misfire had continued to be on cyl #3, then suspect the #3 plug wire, spark plug, fuel injector, or a compression problem on #3 cyl.
Since #4 had been firing ok, but switching its plug wire to the #3 side of the secondary winding & having the misfire switch to #4 cyl, suggests that the coilpack #3 secondary half of that winding has a problem.
Maybe a broken secondary wire, shorted windings, or maybe a case crack underneath thats letting voltage leak or arc to ground, causing a weak or no spark condition.
Case cracks underneath are common. Would be interesting to hear whats found.
If the misfire had continued to be on cyl #3, then suspect the #3 plug wire, spark plug, fuel injector, or a compression problem on #3 cyl.
Since #4 had been firing ok, but switching its plug wire to the #3 side of the secondary winding & having the misfire switch to #4 cyl, suggests that the coilpack #3 secondary half of that winding has a problem.
Maybe a broken secondary wire, shorted windings, or maybe a case crack underneath thats letting voltage leak or arc to ground, causing a weak or no spark condition.
Case cracks underneath are common. Would be interesting to hear whats found.
Fleet Mechanic
Joined: Feb 2007
Posts: 1,716
Likes: 0
From: Boston, MA
Since he only had a trouble code for the #3 cyl, not the #4 cyl, which uses the other half of that secondary winding, by switching the plug wires at the coil pack, on our waste spark ignition system that fires the plugs on every rotation of the crank shaft, he was just exchanging coil halves & reversing spark polarity to the plugs, to check the plug wires & both halves of the secondary winding.
If the misfire had continued to be on cyl #3, then suspect the #3 plug wire, spark plug, fuel injector, or a compression problem on #3 cyl.
Since #4 had been firing ok, but switching its plug wire to the #3 side of the secondary winding & having the misfire switch to #4 cyl, suggests that the coilpack #3 secondary winding has a problem.
Maybe a broken secondary wire, shorted windings, or maybe a case crack underneath thats letting voltage leak or arc to ground, causing a weak or no spark condition.
Case cracks underneath are common. Would be interesting to hear whats found.
If the misfire had continued to be on cyl #3, then suspect the #3 plug wire, spark plug, fuel injector, or a compression problem on #3 cyl.
Since #4 had been firing ok, but switching its plug wire to the #3 side of the secondary winding & having the misfire switch to #4 cyl, suggests that the coilpack #3 secondary winding has a problem.
Maybe a broken secondary wire, shorted windings, or maybe a case crack underneath thats letting voltage leak or arc to ground, causing a weak or no spark condition.
Case cracks underneath are common. Would be interesting to hear whats found.
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Thread Starter
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Freshman User
Joined: Feb 2008
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From: Greensboro,North Carolina
I'll get a coil pack on order and get back to you with the results.
Pawpaw; excellent details on how it works. That was exactly what I was looking for.
Thanks,
Ken
Pawpaw; excellent details on how it works. That was exactly what I was looking for.
Thanks,
Ken
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Moderator
Joined: Jan 2004
Posts: 13,851
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From: SW Va
Hold on, before you order, do the secondary resistance check between the coil pack #3 & #4 plug wire connection terminals that powersmoked suggested, or lift the coilpack on an insulator & look for arcing at idle, when you spritz it with a spray bottle of water. If you get a positive, Then spend your gold!!!!
Thread Starter
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Freshman User
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From: Greensboro,North Carolina
Using an Ohm meter, I could not tell any difference between 3&4 and 1&6.
I tried carb cleaner and Q-tips in an attempt to eliminate any carbon tracks, no joy.
I found a new one on E-pay for $40. Wish me luck.
Thanks again,
Ken
I tried carb cleaner and Q-tips in an attempt to eliminate any carbon tracks, no joy.
I found a new one on E-pay for $40. Wish me luck.
Thanks again,
Ken
Thread Starter
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Freshman User
Joined: Feb 2008
Posts: 28
Likes: 0
From: Greensboro,North Carolina
Results of new coil pack: Hallelujah! Idle smoothed out, no misfire and as a bonus no more shuttering power loss under load; which, I was thought was another problem.
Thanks all,
Ken
Thanks all,
Ken
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Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Good find fix & feedback & Thanks for closing out your thread.
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