rough idle, check engine light, but no codes? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 9 Old 11-16-2015, 10:35 AM Thread Starter
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rough idle, check engine light, but no codes?

Anyone have this happen to them? My 2010 is running ok but idling rough (around 4-500 RPM's) and the check engine light came on today but when I checked for codes it hadn't recorded any. I'm gonna take it into the shop tomorrow just wanted to see if there was any easy fixes I could try before I take it in...

Thanks!
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post #2 of 9 Old 11-16-2015, 04:04 PM
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Did you use a code reader? Or did you use the JK's self-reader?
Some codes don't show with the self-reader.

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post #3 of 9 Old 11-16-2015, 04:10 PM
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Originally Posted by Bionicrooster View Post
Anyone have this happen to them? My 2010 is running ok but idling rough (around 4-500 RPM's) and the check engine light came on today but when I checked for codes it hadn't recorded any. I'm gonna take it into the shop tomorrow just wanted to see if there was any easy fixes I could try before I take it in...

Thanks!
Back around 35k miles, my 2010 started having an occasional rough idle, and it died once or twice at stoplights.
I cleaned the throttle body and swapped out the spark plugs and PCV valve, and that shaped it up.

A year or so ago, I had a crappy-ish idle resulting from a cracked exhaust manifold (new manifold fixed it).

That's all I have to offer. My shitbox has been relatively trouble-free (until I jinxed it by typing this ).

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post #4 of 9 Old 11-17-2015, 06:33 AM
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Mine is doing the same. I checked the throttle body and it seems pretty dirty. I'm going to try the same thing and clean it and throw some new plugs in there as well.
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post #5 of 9 Old 11-17-2015, 08:56 AM Thread Starter
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Thanks guys, any idea how to check / clean the throttle body?
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post #6 of 9 Old 11-17-2015, 10:15 AM
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I just pulled the air intake off and stuck a paper towel in there and it came out with a lot of black. I had a similar problem on a dodge truck with it surging at idle and I sprayed it all out with electronics cleaner. That cleared up the problem then so that's my plan now, too.
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post #7 of 9 Old 11-17-2015, 01:34 PM
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Thanks guys, any idea how to check / clean the throttle body?

I pull the throttle body off and spray it with carb cleaner. The sticky residue just runs right off. I would change your plugs and wires also.
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post #8 of 9 Old 11-21-2015, 10:21 AM
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I had the same problem earlier this year. I went to the stealership and walked out with some Mopar throttler body cleaner (part# 04897156AC) for free.99 and it worked great. I pulled the throttle body and sprayed both sides off. I also used some Seafoam and cleaned out the top end too.

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post #9 of 9 Old 11-23-2015, 08:01 AM
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Originally Posted by piratim View Post
I just pulled the air intake off and stuck a paper towel in there and it came out with a lot of black. I had a similar problem on a dodge truck with it surging at idle and I sprayed it all out with electronics cleaner. That cleared up the problem then so that's my plan now, too.
Only different sggtn I'd make is not to use paper towels ; ya don't want anything tearable in the throttle body because the butterfly valve edges are sharp enough to cause paper to tear if it closes on the 'quicker-picker-upper" rag. Use of shop towel or old T-shirt doused w\ the throttle body cleaner a better option ....


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