Causes of Rough Idle when.....
#1
11-16-2002, 01:01 PM
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Causes of Rough Idle when.....
What are the causes of rough idle when the truck is in gear ? Put it in neutral and smooth as silk . (1980)400M/C6 4x4 . There are no vacuum leaks , new plugs , cap / rotor etc...
If it idled erratic in park/neutral I`d suspect a vacuum leak but its smooth . Ideas , thoughts ??
Thanks
Jeff
If it idled erratic in park/neutral I`d suspect a vacuum leak but its smooth . Ideas , thoughts ??
Thanks
Jeff
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11-16-2002, 03:04 PM
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11-19-2002, 04:00 PM
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#5
11-19-2002, 06:14 PM
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Causes of Rough Idle when.....
[updated:LAST EDITED ON 19-Nov-02 AT 07:15 PM (EST)]You know thats a darn good idea because now that I think of it , putting on the brake , it does get worse . I`m going to check that as soon as the monsoon around here stops 
Last weekend I checked the vacuum at idle , with the truck in park and the reading is rock steady at 14 . No fluctuations at all on the gauge , if it was worn engine components , the vacuum would wander or jump . At least thats been my experience so far with engines . Thanks for the tip .
Jeff
Last weekend I checked the vacuum at idle , with the truck in park and the reading is rock steady at 14 . No fluctuations at all on the gauge , if it was worn engine components , the vacuum would wander or jump . At least thats been my experience so far with engines . Thanks for the tip .
Jeff
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11-22-2002, 10:25 AM
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11-22-2002, 05:22 PM
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#8
11-25-2002, 07:28 PM
#9
11-27-2002, 04:29 AM
Causes of Rough Idle when.....
>I checked into the brake theory and its not that . I`ll keep
>fiddling around till I find the culprit
>
>
>Jeff
Jeff check the booster by taking of the vaccuum line going to the booster and blocking the end. If the idle smoothes out then you definitely have a bad booster. I just recently had to change mine.
>fiddling around till I find the culprit
>
>
>Jeff
Jeff check the booster by taking of the vaccuum line going to the booster and blocking the end. If the idle smoothes out then you definitely have a bad booster. I just recently had to change mine.
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11-27-2002, 06:16 PM
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Causes of Rough Idle when.....
Thanks Seymour , I never did get that far but I have Friday off and its going to be SUNNY so I`ll mess with that first . You know , like some other 400M`s I`ve heard , I have a couple(few) noisey rockers and I`m wondering if that would be enough to make it idle lumpy ??
Jeff
Jeff