i have a gsr and it is actually stock right now...even wen it was turboed i had the same problem. Once in a while the rpm needle will be off and will jump around like a guitar tuner...wat can be wrong? any help will be much appreciated. thanks

 

Did the car bog or engine cut out at all when it was jumping or was it just jumping around while the car seamed fine?

 

Have you touched the Ecu? I had the same problem and it was a ground to my Ecu.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JasonST &raquo;</TD></TR><TR><TD CLASS="quote">Did the car bog or engine cut out at all when it was jumping or was it just jumping around while the car seamed fine?</TD></TR></TABLE>

jumping around wen the car seemed fine

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jthm &raquo;</TD></TR><TR><TD CLASS="quote">Have you touched the Ecu? I had the same problem and it was a ground to my Ecu.</TD></TR></TABLE>

the ecu has been tapped to a vafc but the vafc is set at 0

 

nooooobody knowsssss...the trouble i seeeeee????
lol

 

Not sure about this, but maybe clean your IACV. Caused my friends LS to sometimes jump during idle.

 

crazy tach = bad ignitor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crx_88_si &raquo;</TD></TR><TR><TD CLASS="quote">crazy tach = bad ignitor.</TD></TR></TABLE> for this man

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crx_88_si &raquo;</TD></TR><TR><TD CLASS="quote">crazy tach = bad ignitor.</TD></TR></TABLE>

 

my friend had the same problem and it was the ignitor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crx_88_si &raquo;</TD></TR><TR><TD CLASS="quote">crazy tach = bad ignitor.</TD></TR></TABLE>

 

try removing the vfc and see if the tach stabilzes.

 

But looks like distibutor/ignition issues.

 

http://www.g2ic.com/tegtips/engine/10.html i did this and it solved my problem

 

you guys are COOOOOOOOLLLLLL!!!!!! imma try that to see if it works...

 

Most likely loose ground.

 

ignitor