Misfire! Help! - JeepForum.com
 
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post #1 of 6 Old 03-13-2015, 12:18 PM Thread Starter
amacree
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2003 TJ Wrangler 
 
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Misfire! Help!

I have a 2003 TJ 4.0 5 speed manual. The other day I was driving home from work and started having a real bad misfire. Engine would not go higher than 25mph, gauges tachometer and speedometer gauges jumping all over the place. I stopped at the auto parts store and had them read the engine light code. It read an engine misfire as expected, and I replaced the ignition coil rail. It ran great for about 3 days afterward. Today I jumped in and before I got out of my driveway I started having the same exact problems. I started reading some posts about the alternator being bad can cause engine misfire. Is this possible?

I plan on removing the alternator and getting it checked out, but has anyone had this problem before? If so, what was the fix action and how?

Thanks to everyone in advance for all the comments and advice.... This forum rules!!

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post #2 of 6 Old 03-13-2015, 12:21 PM
Jeepsr4me
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Did you change the plugs also.. Fastest way to burn up a coil is to have fouled plugs ...
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post #3 of 6 Old 03-13-2015, 01:02 PM Thread Starter
amacree
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I just came inside from checking the spark plugs and saw your post Jeepsr4me. I guess in my haste to get the coil on a few nights ago my [email protected]$$ didn't think to check them then. They are pretty bad and I'm going to replace them now. Do you think this could have ruined my new ignition coil rail? and would this have anything to do with the gauges being all screwy too in your opinion? I just hope this doesn't turn into a drawn out chase to track down the real problem
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post #4 of 6 Old 03-13-2015, 02:41 PM
Jeepsr4me
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change the plugs and see...
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post #5 of 6 Old 03-13-2015, 03:30 PM
u812
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2002 TJ Wrangler 
 
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My daughters 08 Caliber did the same thing with a bad alternator. The first thing it with start doing was missing and would not accelerate. Was told the electronic throttle control on it needed slightly more volts than anything else so it would start doing that before the engine lost enough power to shut down.
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post #6 of 6 Old 03-13-2015, 03:59 PM Thread Starter
amacree
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2003 TJ Wrangler 
 
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Posts: 41
Well after replacing the spark plugs it stopped the misfiring. Then I had the local parts store clear the check engine light and rode around for a little bit to see if it came back. Nothing yet.....I'm not completely sold that will completely fix the problem since it rode well for three days after replacing the ignition coil rod. Hopefully that's all that needed to be done. Thanks for the quick responses. For anyone searching with the same problem, I will repost if the issue comes back. But for now I'm glad my Jeep is running smooth...
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alternator , gauges , ignition , misfire

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