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Old 05-16-2013, 03:28 AM   #1
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Manufactured plug gap: Champion 7034's.

So I bought a set of Champion 7034’s based on the recommendations on this forum.

When I checked the manufacturer’s gap (the gap the plugs were made with) I found the plugs were gapped at almost .050”. The gap I need for the 4.0L engine is .035”.

I’ve been using Champion plugs for 30 years. I have never seen a Champion plug that was not gapped from the factory very far off from what the engine requires, so, I was surprised to see such a large gap on these 7034’s.

I presume this is due to the fact that the 7034’s can be used in a variety of engines, some of which might require such a large gap, so Champion makes the plugs this way, am I right?

I know I can close the gap, but the ground electrode will not be parallel to the base of the plug, which is the desired outcome and the reason why it is important to manufacture the ground electrode gap close to the final number needed by the application.

Anyone have any issues with closing down the .050”+ gap to .035”? Thanks.

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Old 05-16-2013, 05:43 AM   #2
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I'm a longtime Champion user also and use them in everything I own, never an issue
You did'nt mention what year your Jeep is but for the Coil on plug 4.0's the Champion 7034 was a very good choice. It has the correct heat range and is a double-tipped platinum plug that will last 100k with no problem.
Carefully gap them to the spec label on your Jeep and your good to go!

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Old 05-16-2013, 06:20 AM   #3
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Originally Posted by MarkGLHS View Post
So I bought a set of Champion 7034’s based on the recommendations on this forum.

When I checked the manufacturer’s gap (the gap the plugs were made with) I found the plugs were gapped at almost .050”. The gap I need for the 4.0L engine is .035”.

I’ve been using Champion plugs for 30 years. I have never seen a Champion plug that was not gapped from the factory very far off from what the engine requires, so, I was surprised to see such a large gap on these 7034’s.

I presume this is due to the fact that the 7034’s can be used in a variety of engines, some of which might require such a large gap, so Champion makes the plugs this way, am I right?

I know I can close the gap, but the ground electrode will not be parallel to the base of the plug, which is the desired outcome and the reason why it is important to manufacture the ground electrode gap close to the final number needed by the application.

Anyone have any issues with closing down the .050”+ gap to .035”? Thanks.

That is correct, the same plugs can be used in different engines and different gaps are required. You NEVER go with or TRUST plugs to be pregapped for you specific application. You always check and adjust as required for your vehicle. It does not matter that the electrode is perfectly parallel. The spark is always going to take the shortest path. Just tap the electrode closer and then spread it back out with the gap tool to .035 (been changing and gapping plugs for 30 years)
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Old 05-16-2013, 06:50 AM   #4
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thanks for the feedback...i agree i never trust the gap to be correct out of the box I always inspect each plug and make adjustments....its just i have never had to close such a big gap and was concerned about the operation of the plug.

my 4.0L is a 2002.
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Old 05-16-2013, 09:12 AM   #5
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You NEVER go with or TRUST plugs to be pregapped for you specific application. You always check and adjust as required for your vehicle.
That depends entirely on the type of plug. The gap on some plugs is not adjustable, so it's critical that the "out of the box" gap is correct.
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