Rough/stumbling idle 2001 discovery 2
#1
01-18-2019, 07:39 PM
Rough/stumbling idle 2001 discovery 2
I have a rough/stumbling idle it started out to just do it here or there at red light now it’s almost always at idle. I have no check engine light. I have replaced spark plugs,coils,wires,fuel injectors upstream o2 sensors I cleaned idle air valve, oil separator. I really don’t know what else to check !!!
#2
01-18-2019, 08:47 PM
TReK
#3
01-18-2019, 09:04 PM
Super Moderator
#4
01-19-2019, 08:33 AM
#6
01-19-2019, 06:10 PM
Pro Wrench
#7
01-19-2019, 07:06 PM
#8
01-20-2019, 05:50 AM
Camel Trophy
Join Date: Oct 2016
Location: St. Clair County, Michigan
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How many miles? Timing chain and gears, low compression, vacuum leak, maybe try changing gas stations or low fuel pressure (bad pump).
I guess, if l did all of the work you've done with no improvement...my next step would be...throwing a vacuum gauge on it...this will tell you the quailty of the engine. Then check compression and/or exhaust manifold at each cylinder when hot at idle, with IR gun, to see if you have an unusually low output cylinder(s).
Also, are you sure your check engine/service engine soon light works? Does it come on when you first turn the key to the second position?
Brian.
I guess, if l did all of the work you've done with no improvement...my next step would be...throwing a vacuum gauge on it...this will tell you the quailty of the engine. Then check compression and/or exhaust manifold at each cylinder when hot at idle, with IR gun, to see if you have an unusually low output cylinder(s).
Also, are you sure your check engine/service engine soon light works? Does it come on when you first turn the key to the second position?
Brian.
#9
01-20-2019, 07:25 AM
How many miles? Timing chain and gears, low compression, vacuum leak, maybe try changing gas stations or low fuel pressure (bad pump).
I guess, if l did all of the work you've done with no improvement...my next step would be...throwing a vacuum gauge on it...this will tell you the quailty of the engine. Then check compression and/or exhaust manifold at each cylinder when hot at idle, with IR gun, to see if you have an unusually low output cylinder(s).
Also, are you sure your check engine/service engine soon light works? Does it come on when you first turn the key to the second position?
Brian.
I guess, if l did all of the work you've done with no improvement...my next step would be...throwing a vacuum gauge on it...this will tell you the quailty of the engine. Then check compression and/or exhaust manifold at each cylinder when hot at idle, with IR gun, to see if you have an unusually low output cylinder(s).
Also, are you sure your check engine/service engine soon light works? Does it come on when you first turn the key to the second position?
Brian.
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