'85 duke that i got free a few weeks ago starts right up now but idles at about 2700 rpm. where should i begin looking? i have an '84 parts car so i might have whatever it is i need. also....this is gonna sound stupid but the '85 has a broken shifter or select cable and i'm not sure whether its a 4 speed or 5 speed. guy i got it from said it was a 4 speed but i found a 5 speed shift knob in the car. what would be the easiest way to tell?

[This message has been edited by Nazareth (edited 10-08-2003).]

i ran the codes and got 15 and 34 coolant sensor and map sensor... should i change both or will one cause faulty readings from the other?....

[This message has been edited by Nazareth (edited 10-08-2003).]

Have you checked the sensor grounds with an ohm meter? Sounds like one of them is missing. The TPS and CTS share a ground so that might be a place to look first.

haven't tried that yet but i'll get it this weekend...thanks alot for the reply spark1

Also, if it's the original transmission it's a 5-speed. Here are a couple of links:
http://www.k12.nf.ca/gc/Staff/Teachers/Crummey/fiero/transmissions.htm
http://floridafieros.org/osg/tranny.html

vacuum leak?
TPS?
IAC?

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'84 2m4 se, a work in progress http://www.mtsu.edu/~mkr2c/fiero.htm

They are both relatively cheap sensors, so I'd replace em anyway. It's always good to keep an extra MAP in the glovebox. I keep a little "fun" box in the "trunk" with a few little items just in case, like fuses etc.

Have you driven it around some? It does take the ECM a little while to "acclimate" itself.

If you have a five speed shift knob, It's a replacement. The shift pattern for a Fiero is on the console. The knob is blank and you probably have a 4-speed.