on startup the engine idles around the normal 850rpm. after a long hour's drive to work, the revs sit around 1500 to 2000 and doesnt seem to drop off.

 

not sure if this is right for a zed or not?

should have said when satationary after a hours dirve the revs are aound 1.5 - 2k

Basically no it isn't right. The idle when warm should be 750 yours is a little high at 850. Check your tps voltage is between 0.4 & 0.5 (ideal is 0.44). If it's outside this then you need to adjust it. Once you've checked/adjusted the tps then you need to check the IAA base idle. (search for Base idle adjustment to tell you how to do this).

Also check your temperture sensor is clean and you have a good conection

http://www.300zx.co.uk/forums/showthread.php?t=138532&highlight=high+revs

and the timing.... 15 degrees from TDC (for the tt, don't know about the na)

Mine used to do that on the odd occaision, just before it blew up. I used to turn the aircon on and off until it dropped back to normal. Not sure how helpful that is, but seemed to do the trick.

LOL.. may work but not actually a fix!!! there could be a problem with your IAA then...

 

but Spartan-117 should do the usual check all the connectors for corrosion and good contact and the other checks to rule out issues with those components...

Mine is around 750 - 800 when stopped and with the heater off.

 

However, If I have the heater on mine is over 1,000 at idle.

that isn't a problem.... you're sounds OK...

how is the tps checked, not sure what pins to use. does anyone have a picture?

where is the tps and adjustment pot

never mind found a good guide for the tps. will also check the other stuff out when i get the time. (dame the 300's complex!)

 

cheers