How steady is your tach
#1
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Location: Waterloo, Iowa
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Year: 2000
Model: Cherokee
Engine: 4.0
How steady is your tach
I have a 2000 Cherokee Sport with the 4.0 and was wondering how steady everyones tach is? Mine will fluctuate maybe 1/8 " which would equal maybe 50-75 rpm? Is this normal or is everyones tach rock steady at a certain rpm? I just bought this a little while ago and wanted to know what is considered "normal".
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#8
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Year: 2000
Model: Cherokee
Engine: 4.0
#9
Sitting at curb idle, every few seconds like clockwork the tach will jump a tad, then right back to steady. You could set your watch by it.
I'm pretty sure it's the electric fan kicking in ever so often.
I'm pretty sure it's the electric fan kicking in ever so often.
#12
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Year: 1998
Model: Cherokee
Engine: 4.0
Cleaned my IAC today after reading this post and doing some searching. Found a good write up on how to clean the IAC. Took about 30 minutes. It was pretty dirty and carboned up. Jeep idles MUCH better now. Nice and smooth.
#13
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Year: 1998
Model: Grand Cherokee
Engine: 5.9
My tach fluctuates a little less than at odd intervals at idol, It could be just because the 4.0 is an MFI, and it adjusts its idle essentially - that's just my understanding, somebody call me on it by all means if it's complete bulls**t.
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