318 V8 ignition coil - major problem - DodgeForum.com

Go Back   DodgeForum.com > Dodge Vans & CUVs > Dodge Ram Van
Log In 

Dodge Ram Van The full size Dodge Ram Van that showed that we can go and do as we please. Discuss the Dodge Ram Van here today.

318 V8 ignition coil - major problem

Thread Tools Search this Thread
Old 06-29-2011, 02:28 PM
FDSJr FDSJr is offline
Registered User
Join Date: Dec 2009
Posts: 6
Default 318 V8 ignition coil - major problem

I have a 1993 B250 Ram Van with a 318 V8. The PCM was acting up (no signal to #5 injector), so the dealer replaced it with a new PCM. This was on June 17 and all seemed to be fine.
Then, on June 22, the OEM ignition coil failed. This was after 1 1/2 hours of driving since the new PCM was installed.
The dealer installed an aftermarket ignition coil to replace the failed one.
On June 27 the new coil failed.
Since I was on vacation and about 200 miles from home, I had it towed to a different dealer. That dealer installed an identical aftermarket coil.
After about 2 hours of driving, that coil also failed.
The vehicle was then towed back to the original dealer. They installed an OEM coil this time, but I have no confidence that it will last very long until it is also killed.
I have had 4 ignition coils fail in the 10 days since the PCM was replaced.
The dealer claims it can't possibly be the PCM that is causing it. I tend to disagree since the replacement of the PCM was the only thing that was done before this all started to happen.
Does anyone have any thoughts on this mystery?
Reply With Quote
Old 06-29-2011, 07:21 PM
jasonw's Avatar
jasonw jasonw is offline
Site Moderator
Dodge Forum Moderator
Join Date: Jan 2008
Vehicle: 2013 Ram 1500 4X4
Location: Sioux Falls, SD
Posts: 8,304

Welcome to DF. First, before anything else, please read this.

I will move this to the Ram Van section for you.
Reply With Quote
Old 06-30-2011, 12:09 AM
alloro alloro is offline
Van & CUV Section Moderator
Dodge Forum Moderator
Join Date: Nov 2006
Posts: 4,003

The PCM regulates alternator power. If the new PCM isn't doing so, there could be too much power going into the ignition coil and burning it up. The first step would be to take volt reads at the coil's primary wires both at idle and at 1500-2000 RPMs.
Reply With Quote
Old 06-30-2011, 01:31 AM
stev's Avatar
stev stev is offline
Record Breaker
Join Date: Dec 2005
Vehicle: 2001 Dodge Ram Van B2500 V8 5.2L, 3.92:1, RoadMaster MKII-XXF
Location: Nashville
Posts: 1,354

And to replace the ignition coil, it only takes a few turns on the wrench and pop off the wire. Having a dealer do this is costly. The coil is in an easy place to get at too.

Alloro is correct, the PCM does control the alternator voltage. Go back to the first dealer, take with wisdom and get the PCM replaced with one that works. Also see if they will ocver the coils that burned up too.
71 Duster 340, 74 T&C 440-Interceptor, 74 Duster /6 225, 76 Aspen /6 225, 79 Volare S/6 225, 81 Pacer I6 258, 88 Colt I4, 85 Caravan 2.6L, 94 Caravan 3.0L, 96 Caravan 3.3L, 00 Ram Van B1500 3.9L, 01 Ram Van B2500 5.2L, 05 Caravan SXT 3.8L
Reply With Quote
Old 06-30-2011, 01:22 PM
FDSJr FDSJr is offline
Registered User
Join Date: Dec 2009
Posts: 6

Thanks to Alloro and Stev. The service tech at the second dealer was very helpful. He took me into the shop and showed me exactly where the coil was located, how to get at it, and how to replace it. I am not sure that his bosses would appreciate him passing on that money saving tip....but, I appreciated it.
The coils (after the first failure) have been replaced at no cost to me, other than the aggravation of having to wait to be towed to the dealer and wait for the repair to be completed (but, towing costs were paid in full by AAA).
I will check the voltage at the primary leads of the coil and see if that tells me anything.
Thanks again to both of you.
Reply With Quote
Old 07-04-2011, 03:16 PM
FDSJr FDSJr is offline
Registered User
Join Date: Dec 2009
Posts: 6

I have a little more information and want to see if anyone has additional insight.
The dealer is still reluctant to to look at the PCM as the culprit since the latest coil hasn't failed (yet). I also haven't driven the van much since the latest coil replacement, but I am sure that it will eventually fail.
During this latest coil replacement, the dealer said that they found the resistance on the battery negative cable to be a little high and claimed that this could be the cause. Maybe I am missing something here, but it would seem that a high resistance would reduce the voltage and power rather than increase it and cause the coil to burn up.
I have not been able to check the voltage at the coil primary leads, yet, but I did check the alternator voltage at the battery. It is no higher than 14.28 volts, even at very high rpm.
When I am able to check the coil primary voltage, what value should I expect to see if things are operating normally?
Thanks again for any help that you can give.
Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Coolant in oil, oil not in coolant. SteveTangential 1st Gen Ram Tech 4 09-10-2015 11:38 AM
Help! Track bar problems!! Mudslinger12 3rd Gen Ram Tech 2 07-14-2015 07:18 PM
Need help getting out fuel rail and injectors 2001 4.7L bdkiger 2nd Gen Dakota 1 07-07-2015 05:44 PM
OMG p0303 500e Dodge Charger 1 07-05-2015 11:23 AM
code P0303 OMG 500e Dodge Charger 0 07-05-2015 11:20 AM

318, ignition coil, pcm

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -4. The time now is 03:28 PM.