Rough idle and smoke - JeepForum.com
 
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post #1 of 6 Old 10-23-2019, 12:46 PM Thread Starter
Jfjustin
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Rough idle and smoke

Hello first time on here. 2006 3.7 wk. Anyone else have the rough idle in gear at complete stop? Also just started ro smoke a little when at temp. Also no codes coming up so dealer tech cant figure anything out. Any help in the right direction would help, thanks

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post #2 of 6 Old 10-23-2019, 12:51 PM Thread Starter
Jfjustin
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A certified chrysler/jeep tech couldnt getit to throw codes
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post #3 of 6 Old 10-28-2019, 11:48 AM
ZJjustin
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How many miles?

White smoke? Black smoke?

Idles smoothly in neutral?
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post #4 of 6 Old 10-28-2019, 03:19 PM
YouStupidBunny
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I would guess that the smoke is a separate issue than the rough idle. It's a 2006, so probably high miles with worn piston rings. With worn piston rings, oil can leak into the combustion chamber. The burning oil will cause it to smoke.

Since you had a tech look at it, I'll assume he tested the common idle issues like spark plugs, injectors, and fuel pressure. A failing camshaft and crankshaft sensors are a common source of rough idle. When they get bad, you may experience; poor MPG, loss of power, difficult to start, stalling. It's also common for neither sensor to trip a trouble code until they are bad enough to lose communication with the PCM.

Both parts are easy to replace and cheap. You can get both parts on Ebay for less than $150 and it'll take less than an hour to replace both even if you're not handy in the garage. Just make sure you order Mopar parts. Don't trust sensors from your local auto parts store.
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post #5 of 6 Old 10-30-2019, 10:05 AM Thread Starter
Jfjustin
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Idles fine in neutral. Its light smoke id say white.15300 miles
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post #6 of 6 Old 10-31-2019, 09:51 AM
ZJjustin
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You can check for worn piston rings, it's called a compression test/check. The gauge for it is inexpensive and instructions are everywhere.

White smoke is usually antifreeze/coolant. Check your oil dipstick, any milky looking fluid on it that doesn't look like normal oil would indicate something in the head is leaking coolant. Could be a failed gasket, as the engine heats up and the metal moves, the coolant finds a path to the combustion chamber causing the smoke. That same leak could cause compression/performance problems. So if you do a compression check you should probably do it with the engine both cold and warm.

YouStupidBunny is right about those sensors failing frequently, they also tend to not throw a code. Very few are lucky enough to see a code for those and spend a lot of time trying to figure it out.
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