my speedo is bouncing up and and down and all around, lol, but if i turn my cruise control on, but dont set it, the speedo works fine. whats weird is my cruise control has never worked, and i just recently put a b20 vtec in my car,

once idea i had was the vss or the cluster, but i have an ITR intake manifold, so there is once less place to put a vaccum line to it..... any suggestions, sorry if this is real confusing....

 

If your speedo is bouncing around my guess would be either the vss or speedo cluster. Leaning more towards a bad cluster.

 

but why would the cruise control being on change it? and make it work again?

 

bump

 

my car did this... right before i blew the fuse for for my vss....
everytime this has happened to me my speed sensor stops working... so then once i fix it it makes the speedo stop bouncing up and down...

 

so your saying its the VSS? and i should just replace that?

 

mine did that and it turned out the plug on the harness was bad and it wasnt making constant contact. i went out of my way and changed my cluster and bought a vss and it was the harness

 

sorry i didn't make my post very clear what i meant to say is that everytime it happens i check the vss plug... (i think mine is not exactly 100%) and then i change the fuse... it has never been the vss
i have had this happen like 4 times in the last year and everytime it hasn't been a bad vss

 

double check your grounds.

 

i'm with him ^^^^..... maybe its stops bouncing because when you turn the cruise on it has its own ground and runs through that???? Just a wild guess.....

 

when i cruised in neutral my rpm's bounced like a mad man

solution.........-vaccum leak.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mikebpem1 &raquo;</TD></TR><TR><TD CLASS="quote">when i cruised in neutral my rpm's bounced like a mad man

solution.........-vaccum leak.</TD></TR></TABLE>

But then how does that explain the cruise control switch fixing it...... ground is my guess

 

i had the same issue a week ago it happend to be my grounds just make sure your grounds have a good contact try to clean the surfaces with some sand paper worked for me

 

hope you fixed that problem...cause if it's the grounds. the ground screw will only get looser with the engine vibes and the ground will actually effect your sparks and make the motor Skipp bangs on your pistons. and the feel nasty. cause you car briefly tries to stop.