bouncing tach

[93laser1g]

any idea why my tach has been bouncing? the car is idleing at 750 then it just bounces up and down but the car doesnt rev up or bog down when this happens

 

[pyanac711]

Does it have aftermarket cams? Or the alternator can be going bad.

 

[Ozone302]

....

 

[Redslayer]

....

I can't read braille

 

[Ozone302]

Haha sorry my phone is being weird. U said the engine doesn't match what the tach is doing?

 

[DSMBanditFZ6]

I would check your connections. If I was at a computer I would throw the" noise filter delete" link your way. Do a search for that it helps.

I don't want to be a dick but post this in a tech forum and not in the newbie forum(see rules). I have made this mistake before. but if search results come up nothing I would post it in the electircal forum or whatever.

Not trying to berate you, but just trying to help you out.......

Good luck. Let us know the outcome.

 

[Clever Gs-t]

It could be a bad gauge cluster. Or the tach wire could be getting interference from another source like the alternator. Finding the tach wire at the engine compartment and shielding it with foil wrap could help the issue.

 

[DSMBanditFZ6]

My brother to the north clever gst.
My car was a Missouri car, and its still rocking a 417 motorsports sticker. Do you know this place? Im about to change it to 501

 

[Clever Gs-t]

I do know 417Motorsports. Blake has a BMW with a stock bottom end 4g63t that is stupid fast. He really knows his Dsm's. I work down in Conway. So I know where your at as well. Small world.

 

[93laser1g]

Does it have aftermarket cams? Or the alternator can be going bad.

no i have stock cams and the motor does not match the tach. the motor idles good just the tach is bouncing