ihscoutlover
NAXJA Forum User
- Location
- Edwardsville
Here are two of the plugs after I pulled them to see whats going on within the engine. This one is of the #1 cylinder:
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Timing Situation Part 2
- Thread starter ihscoutlover
- Start date
ihscoutlover
NAXJA Forum User
- Location
- Edwardsville
Here is one of the #4 Cylinder:
ihscoutlover
NAXJA Forum User
- Location
- Edwardsville
Cylinders #2, 3, 5, and 6 were just a tad less carbonized than #1. These plugs have less than 1 driving mile, and 30 mins of operation time on them. Thoughts on this??
Jeff
Jeff
birchlakeXJ
NAXJA Forum User
- Location
- Melrose, MN
How about running a compression test on ALL cylinders for starters. You need to start gathering actual test data here to narrow this down.
The compression spec for the 4.0 is 120-150, with no more than a 30 psi variation between cylinders.
The compression spec for the 4.0 is 120-150, with no more than a 30 psi variation between cylinders.
ihscoutlover
NAXJA Forum User
- Location
- Edwardsville
Could I get refreshed on how to get the correct readings?? Its been several years since I last did a compression check and want to do it right to post up the results. Thanks.
Jeff
Jeff
- Location
- MilkyWay Galaxy
If new plugs got that bad, that fast, I would say the valve seals (oil seals) are SHOT (and or piston rings, but since one looks fine, the odds are bad valve seals IMHO)!!!! I can't see a rich fuel mix doing that in such a short time!!!!
If it was something like a weak spark, it would be weak on all six plugs IMHO.
Only two options, pull and service or replace the head, or on a temp basis install hotter plugs or antifouling spark plug extenders, and some heavy duty snake oil additives, MMO to free up stuck rings first (It could be a ring problem or a valve seal problem, or both), then a thick oil burning oil additive, like Lucas.
Compression test, Do one cylinder at a time, and pull the primary spark plug wire before cranking. With that much oil the test should not need oil addition, LOL.
If it was something like a weak spark, it would be weak on all six plugs IMHO.
Only two options, pull and service or replace the head, or on a temp basis install hotter plugs or antifouling spark plug extenders, and some heavy duty snake oil additives, MMO to free up stuck rings first (It could be a ring problem or a valve seal problem, or both), then a thick oil burning oil additive, like Lucas.
Compression test, Do one cylinder at a time, and pull the primary spark plug wire before cranking. With that much oil the test should not need oil addition, LOL.
