Car ForumAnyone know what a rough idle could mean?Posted:

HTTK
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I drive a 2007 Ford Mustang 4.0 and noticed a rough idle. By rough I mean shaky and loud vibration.

Sounds a bit like a power surge.

My rpms stay at a steady 750 and I just replaced the entire clutch assembly.

Im thinking maybe spark plugs are causing it?

Any thoughts?
#2. Posted:
M3
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Is there a CEL?
#3. Posted:
HTTK
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F80 wroteIs there a CEL?


Nope no lights on the dash
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Misfire possibly?
#5. Posted:
M3
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HTTK wrote
F80 wroteIs there a CEL?


Nope no lights on the dash


injector(s) could be stuck open. could be wet plugs.
#6. Posted:
CWL
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Check for wet plugs, if not that, then check transmission and brakes
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CWL wroteCheck for wet plugs, if not that, then check transmission and brakes


Brakes for a rough idle?
Could you explain this to me
#8. Posted:
CWL
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Sundown wrote
CWL wroteCheck for wet plugs, if not that, then check transmission and brakes


Brakes for a rough idle?
Could you explain this to me

Mine were loose and the break cylinder was snapped in my old durango
#9. Posted:
JZX
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Could be anything related to air, fuel or spark.

An easy check would be to inspect the spark plugs, check the condition of the spark plug but also look at the ceramic coating to see if you can see any cracks. Cracks usually have a burn mark on them so you should be able to spot them quite easily. The spark could be jumping out the sides not giving full spark to the cylinder.

Then trace it up, test the HT leads or coil pack.

Check the throttle bodies aren't getting stuck in a weird position at idle too.
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Could possibly be a misfire. my first suggestion would be to check the spark plugs and see if they're looking good. Most common cause for a missfire is Coil Leads or Spark Plugs.
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