Tach bouncing crazy at 3500 rpms [VIDEO]

[hdjx20]

Hey guys check this video out this is exactly what my tach is doing whether its revving or while driving always at the same spot. if anyone has fixed this kind of problem before please let me know. i have replaced the ignitor and that did not help.
http://www.motionbox.com/videos/d498deb51610e5c55c

[F22HB]

You seriously replaced the ignitor already? That should have fixed it.

[hdjx20]

yeh its got me stumped i looked into it and everywhere i went said that would fix it. im trying to figure out where that blue wire that goes from the ignitor ends up

[F22HB]

The blue wire is for the rpm wire for the ecu and tachometer among other things I'm almost positive. Where did you get a replacement ignitor from?

[hdjx20]

autozone its this one here - http://www.autozone.com/autozone/cat...cyl&store=1793

[F22HB]

hmm that's a good deal. Did you clean off the old and apply new thermal paste when you installed it? From what I've read it is somewhat like installing a processor in a computer.

[hdjx20]

no i didnt apply the thermal paste, could that effect it?

[EJX_Michael]

no i didnt apply the thermal paste, could that effect it?

Yeah it could have fried it. The things get hot.

[hdjx20]

the instant i put it in it couldve fryed? cause i started it up as soon as i got done putting it in and took this video

[wed3k]

thats an ignitor issue. get an oem unit or go home....there's tsb's on this.

[hdjx20]

i have no other symptoms of an ignitor liek car stallign out while driving and having to let it cool off to start it again or anything like that. its just the stupid tach problem and a cold start problem.

[deevergote]

You might want to share with everyone that your wire harness is completely hacked up by the previous owner. That IS your problem... I guess my advice didn't mean much, though, and you had to make another thread.

Good luck to you. Have fun replacing random parts that don't fix your problem. I'm done helping.

[hdjx20]

just making sure there are no other little things that have to do with it. rewiring everythign this weekend. ill let you know how that goes.

[wed3k]

could be a faulty ground then if it is indeed a wiring issue. if the ignitor is trying to ground the primary side of the coil and it never goes to ground...spark never gets distributed.

[deevergote]

just making sure there are no other little things that have to do with it. rewiring everythign this weekend. ill let you know how that goes.

It COULD be something else... but until you fix your wiring, everyone is going to tell you to replace things, like that ignitor, that may not have actually been bad.

Replace the goddamn wiring harness, and we'll go from there. Trust me. Unless you like dumping a ton of money into things that aren't going to fix your problem...