Surging RPM at Idle
11-29-2012, 01:48 PM
#1
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Year: 1999
Model: Cherokee
Engine: 4.0
Surging RPM at Idle
88 XJ when i start it in the morning it surges a few hundred rmps. usually stops after its been completely warmed up. IAC and throttle body clean, new plugs, I'm leaning toward TPS? What do you guys think?
11-29-2012, 03:57 PM
#3
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Correct. With the engine running, spray some throttle body cleaner around where the intake manifold meets the head and all the vacuum lines under the hood. If you spray a vacuum leak, you'll know it.
As for the TPS, it doesn't care whether the engine is cold or hot. but, it is adjustable.
Read through the write-ups in my signature and get ahead of the game by doing some of the maintenance mentioned there which is pretty much free to do.
As for the TPS, it doesn't care whether the engine is cold or hot. but, it is adjustable.
Read through the write-ups in my signature and get ahead of the game by doing some of the maintenance mentioned there which is pretty much free to do.
11-29-2012, 05:20 PM
#4
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Year: 1999
Model: Cherokee
Engine: 4.0
Correct. With the engine running, spray some throttle body cleaner around where the intake manifold meets the head and all the vacuum lines under the hood. If you spray a vacuum leak, you'll know it.
As for the TPS, it doesn't care whether the engine is cold or hot. but, it is adjustable.
Read through the write-ups in my signature and get ahead of the game by doing some of the maintenance mentioned there which is pretty much free to do.
As for the TPS, it doesn't care whether the engine is cold or hot. but, it is adjustable.
Read through the write-ups in my signature and get ahead of the game by doing some of the maintenance mentioned there which is pretty much free to do.
11-29-2012, 10:28 PM
#5
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
1 through 5 plus 11 is a heck of a good start. Post up any questions you may have.
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