constant miss fire codes for spart plugs and coils pack - JeepForum.com
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post #1 of 4 Old 09-20-2017, 10:00 AM Thread Starter
adanvdousdi
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2003 KJ Liberty 
 
Join Date: Mar 2017
Posts: 3
constant miss fire codes for spart plugs and coils pack

i am so frustrated at what to do. i have replaced the spark plugs and coil pack and breather hoses. and throttle body. just this past march 2017. and yet i still keep getting miss fire codes in all spark plugs and coil pack. i dont know what to do. i dont have any issues with the jeep. just that the check engine light is on. the spark plugs that are in there are NGK. should i replace them with a diff kind?

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post #2 of 4 Old 09-28-2017, 11:51 PM
Billwill
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2002 KJ Liberty 
 
Join Date: Jul 2007
Location: White River in the Bush, South Africa
Posts: 1,426
NGK plugs are the most recommened plugs if gapped properly.

What codes are you getting?

2002 2.5 Export CRD Manual 5 speed.
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post #3 of 4 Old 10-02-2017, 08:54 PM Thread Starter
adanvdousdi
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2003 KJ Liberty 
 
Join Date: Mar 2017
Posts: 3
p0300 and beyond... are the codes... and from what i have found at auto zone and such they come pre-gapped... i dont know. should i just change them all out with diff spark plugs?
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post #4 of 4 Old 10-04-2017, 07:13 PM
02blue
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2005 KJ Liberty 
 
Join Date: Aug 2011
Location: Frederick MD
Posts: 1,547
Might want to check your fuel pressure. That's about all I can think of given what you've already done.
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"Hey, ya never know til you try." Kurt Russell-Big Trouble in Little China
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