At start up, engine idles like around 100 rpm. When i step on the gas pedal, it goes back to normal. What might it be?? Thanks for the help

 

spark plugs most likely

 

Fast Idle Thermo Valve

 

So the engine Idles @ 100 rpms?

You do know that the motor will not idle under 400, cause it wont stay on!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vlang29 &raquo;</TD></TR><TR><TD CLASS="quote">Fast Idle Thermo Valve</TD></TR></TABLE>

especially if it's only at a cold startup. if the car is warmed up and you shut it off and start it up do yo u have the same issues? if not then check the fitv

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Acidcrakker &raquo;</TD></TR><TR><TD CLASS="quote">So the engine Idles @ 100 rpms?

You do know that the motor will not idle under 400, cause it wont stay on!</TD></TR></TABLE>


The graduation marks between the 0-1k are NOT even graduations. if the idle is below about 4-500, the tach will register ZERO.. and i've had my engine keep stumbling along as low as 250

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vlang29 &raquo;</TD></TR><TR><TD CLASS="quote">and i've had my engine keep stumbling along as low as 250 </TD></TR></TABLE>

indicated by tach on my vafc, not the dash tach