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Unread 12-21-2007, 03:00 PM   #1
lakailimited06
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1999 WJ 
 
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Location: Long Island, NY
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still rough idle??

ever since i had all my fluids changed/replaced ( all correct fluids ) and a tuneup done ( included:spark plugs replaced fuel injectors also cleaned ) my wj seems to be idling rough when stopped in drive and sometimes when parked..i brought it back to the mechanic which he then told me that the 5th cylinder was occasionally missfiring but not to the point where it was going to become a problem..he then said he cleaned the spark plug and fuel injector again which seemed to cure the problem for that day..next day same problem..recently my wj stalled out on me and i had to have the cam and crank sensors replaced which seemed to reduce the idling problem but it still wasnt normal..could my K&N intake be causing this rough idle, and how bad is this long term/short term...any responses/suggestions are greatly appreciated..

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Unread 12-21-2007, 03:13 PM   #2
greasefingers
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If the misfire is enough for you to notice it, then that is too much for me. A long term misfire is never a good thing even if it is occasional. Eventually, carbon will build up make that cylinder hotter than normal and then a misfire will always be present.
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Unread 12-21-2007, 04:21 PM   #3
Briandl
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It's your K&N, I'd get rid of that junk if I were you, I'd charge you maybe 5.00 to dispose of it...
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Unread 12-21-2007, 04:42 PM   #4
lakailimited06
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i know alot of other guys have intakes do any of them experience the same thing? i got rid of the stock intake and really dont want to purchase another one...any other alternatives??
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Last edited by lakailimited06; 12-21-2007 at 06:07 PM..
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Unread 12-21-2007, 06:35 PM   #5
lakailimited06
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could it possibly be that the temperature on long island right now is ranging from like 25 to 35 degrees outside along with the intake?
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Unread 12-21-2007, 06:42 PM   #6
greasefingers
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Quote:
Originally Posted by lakailimited06
could it possibly be that the temperature on long island right now is ranging from like 25 to 35 degrees outside along with the intake?
No that temperature is simply common for any engine. Thatís why the MAP & Intake temperature sensor are there.

I am not familiar with the 1999 engine. Do they by chance have a MAF (mass air flow) sensor in the intake? As these need to be periodical sprayed with electrical cleaner to remove residue (or in the case of K&N to remove any oiled filter scum)
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Unread 12-21-2007, 06:43 PM   #7
greasefingers
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Since the issue developed after a lot of work was done, I would check for loose vacuum hoses on the Intake manifold.
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94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 12-21-2007, 07:37 PM   #8
lakailimited06
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will do..appreciate it
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Unread 12-21-2007, 09:09 PM   #9
Vestjam
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Quote:
Originally Posted by greasefingers
Since the issue developed after a lot of work was done, I would check for loose vacuum hoses on the Intake manifold.
I can't remember a time when I ever disagreed with Greasefingers...

I was thinking vacuum leak before reading that above caption. The next thing I would consider is if the 'tune up' included cap/rotor/wires along with those new plugs.

Oil from a K&N can mess up a Mass air if there is too much oil on it. The FORD's mass air definitely doesn't like too much oil on the filter.
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Unread 12-22-2007, 06:36 AM   #10
greasefingers
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Quote:
Originally Posted by Vestjam
I can't remember a time when I ever disagreed with Greasefingers...

I was thinking vacuum leak before reading that above caption.
Thanks for the kind words. And keep that 5.9 happy for the holidays
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88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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