XJ ( X351 ) 2009 - 2019

Rough idle

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Old 02-26-2018, 07:05 AM
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Default Rough idle

I have searched and found really nothing like my symptoms. Occasionally when warm the car will go into a rough idle like it has camshaft upgrades. It only happens when in P but will fix itself within a couple seconds, then will start doing it again...then correct itself. Coming from my GEN 3 gm small blocks seems to be a maf issue but no codes where thrown in the XJ. Anyone here have the same issue?Picture just to show that the paint still shines
 
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Old 02-26-2018, 08:16 AM
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Mine had a misfire, rough idle from a bad timing tensioner. It started out very sporadic and got worse. Only happened at idle.
 
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Old 02-26-2018, 10:03 AM
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Appointment made for Wed morning. Heard that was an issue with the SC motors but didn't know it affected the 5.0 NA. Did you car throw any codes?
 
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Old 02-26-2018, 05:38 PM
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No codes, ran perfectly except at idle
 
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Old 03-01-2018, 06:33 AM
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Took it in dealership claimed that it was because of clogged air filters and needed a fuel injector cleaning. I replaced the filters myself....didn't looked clogged to me. I'll see if that helps.
 
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Old 03-02-2018, 10:19 AM
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And did they clean the fuel injectors? I feel like I've read somewhere recently that can be an issue because of the direct injection. Mine had a bit of a rough idle sometimes, changed oil to Amsoil and it went away.
 
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Old 03-03-2018, 05:45 AM
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No they did not. I just ran a treatment of Royal Purple Max fuel cleaner. Car seems to run fine now.
 
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