Whenever i start my car or sometimes when im cruising my tach will freak out and jump like 1000 rpms and then it will settle back down until it does it again. Any ideas what this could be??
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odd reason, but mine did this when the altenator was going out. it totally went away after i had it changed. -
A jumping tach is USUALLY due to a failing ignitor.
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Would that cause the tach to jump?
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I never thought of that. I just figured the VSS would make the speedo screwy, but not the tach.
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Wait shit, yeah its the speedo it messes up. Sorry, its been a long weekend.Originally posted by deevergote View PostThere are no black and white suspension answers!!!!!!!!!!!Comment
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That's what I thought. I figured maybe you were telling me something new...
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Mine had a bad connection on the ground wire. Had recently put a new clutch in and left a ground wire hanging loose somewhere. $90 diagnostic fee, took like 5 minutes for the guy to find and fix. Sorry can't remember which wire.Comment
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i have this issue with my tach when i turn on my ac,
and the same issue with the speedo, when I accelerate suddenlyComment
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if its your tach jumping, its your igniter going out.
If its the speedo jumping, its the VSS going out. I changed my speed sensor and that resolved all the problems.
All you need to change out on that is the top electronic part w/ the plug thats what ususally fails, the bottom gear part never gets bad.
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Igniter going bad, or it might just be a loss wire in the dizzy that going to the igniter.
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mine does this crap too, cept after it has its seizure it gets stuck at 5k... i replaced the vss and solved this issue for a while, so i guess it is the ignitor going out of business...Comment
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Very likely an ignitor problem. The tach signal comes off of it
life is good.Comment
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Something else you might want to check is your O2 sensor. It will also make your tachometer jump up and down and idle and driving speeds. The vehicle speed sensor "VSS" isn't directly controlling your tachometer. It will work just fine even with the VSS removed.Comment
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i'll put up a video of how mine is uber stupid see if you got the same problemComment
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