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bustedknuckles 07-27-2013 03:19 PM

idle issue?
Very small "miss" at idle. This normal for 04 4.0?

When I drive everything is fine plenty of power. Replaced the plugs. No change.

Notoriously_rob 07-27-2013 03:32 PM

Check your wires and or distributor i u have it

bustedknuckles 07-27-2013 04:12 PM


bustedknuckles 07-27-2013 04:17 PM

I can get a new coil for 94$

Jerry Bransford 07-27-2013 04:18 PM

They all have coils, do you have a distributor or is it a coil-on-plug spark rail?

Has your mpg taken a recent drop? Exactly what spark plug brand & model # spark plugs have you been running?

Any notice of a gasoline aroma?

Does it idle too low or just has a miss at the usual idle rpm?

And no, a miss at idle is not normal.

bustedknuckles 07-28-2013 05:47 PM

Champions. Yes coil rail no wires. Seems normal around 800 rpm. I do about 70 miles a day all highway around 75-80 mph at 2500 rpms or more. Roughly 200 miles a tank. 229 last week.

bustedknuckles 07-28-2013 05:48 PM

It's a very small hicup at idle. Everything else seems great.

Jerry Bransford 07-28-2013 05:50 PM


Originally Posted by bustedknuckles (Post 4013050)

Ok great but as asked above, what specific model Champions? Some Champion spark plug models listed as appropriate for the TJ won't work well on 2000 and newer that have the distributorless ignition system. For example, the Champion 3034 is listed as ok but its single-tipped platinum coating design (platinum on just the center electrode) can cause rough idles, missing, etc. If the 3034 is installed, replace it with the 7034 which is double-tipped platinum... i.e. its platinum coating is on both sides of the gap. This is important because the TJ's distributorless ignition fires each plug on every stroke but in opposite directions every stroke.

bustedknuckles 07-29-2013 11:03 AM

Copper plugs

bustedknuckles 08-03-2013 09:34 PM

7034. 10/4

bustedknuckles 08-06-2013 01:09 PM

How about Bosch double platinum?

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