hello, would any of you experts be able to post a Web site (or suggest a source) that explains *rough idle* (generally) (what is mechanically / technically occurring) thank you in advance!
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A rough idle can be caused by dozens of things, from a fuel or air filter getting plugged to a bad spark plug wire, dirty distributor cap, bad spark plug, to some emissions component with a dirty filter or worn out....
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Oh, so you just want to hear that one or more cylinders not firing correctly, either constantly or intermittently, will result in uneven power pulses from those cylinders, causing a general "roughness"?
If you work on one type of engine all the time, you get to know what is the most 'usual' cause for a rough idle and check that first.
For instance on the Jeep engines I play with, the 'usual' cause for a rough idle is a blocked idle tube in the carb. On the other type of Jeep engine (fuel injection) I work on, the 'usual' cause is a dirty plug on the TPS. (throttle position sensor)
Second 'usual' thing is a dirty distributor cap and rotor, especially on electronic ignitions, so I check that next. (Folks tend to forget about the cap and rotor because there are no points inside it to change during a tune up.)
Then I think of leaky spark plug wires so I open the hood in a darkened place or cover it up so it is fairly dark and spray a mist of water on it when it is running, if wires are leaking voltage the water mist will show it up fast.
thank you for replying (assuming that the above is the end result of the various causes (for example an electrical problem would cause cylinder roughness?)) sincerely Tanya
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