[This message has been edited by josef644 (edited 06-25-2009).]

[This message has been edited by Fieroseverywhere (edited 07-02-2009).]

quote Originally posted by Mickey_Moose: Temp sender (also see NOTE): Located in the thermostat housing (from a 2 wire unit to a 3 wire): use these parts numbers for the correct sender: GM 10096181 AC-Delco 213-815 Borg Warner WT3024 CarQuest TX66 Filko CS-43 GP Sorensen 38-5124 Niehoff DR134TA Napa/Echlin ECHTS4020 Connector comes off a 92 Cavalier or the 3800SC - but most 80-90's GM tps sensor plug will work. pin "A" BLK wire on the switch goes to ecm "E11" pin "B" YEL wire on the switch goes to ecm "E16" pin "C" GRN wire on the switch goes to C500 gage connection NOTE: Some 4.9's have a temp switch in the side of the head: 1) if you car does NOT have a temp gage and just an idiot light you can leave the stock 4.9 sensor in the thermostat housing - wire this to the ECM, the one in the head gets wired to the idiot temp light on the dash. 2) if you have a temp gage in your car you change out the sensor to the above info and wire, the head temp switch can be thrown out (or used for an additional light that you have added to the dash).

Just wanted to toss something out there on this...

For most fieros this is the correct way to wire this in. The only problem I found comes for those who have fixed their pegging temp gauge. Here is a link on how to do the fix...
http://www.fierosails.com/tempgage.html

You have to switch the 2 pairs of wires to correct this mis-wiring from the factory. Problem is for us 4.9 guys we have switched out our CTS's for a 3 wire unit. This makes it a little harder to determine which wires to switch. To make matters worse the 3 wire unit does not run a temp light so technically there is one wire missing from the equation.

The two wires that need to be switched in the gauge cluster do not change. While facing you gauges, the left connector on the back pin 11 needs to be switched with the right connector pin 13. This is the same for all fieros that have this problem.

The two wires in the engine bay that need to be switched are located at the C500. C2 (dk grn/wht wire V6, tan wire L4) and D3 (dk grn wire) are the ones in question. In a fiero with a stock CTS you simply switch these wires at the connector.

Option 1:
In a 4.9 fiero you probably won't even have the wire in D3 hooked to anything... unless you are lucky enough to have the caddy head temp sensor on your engine and decided to use it. You probably hooked the CTS wire to C2 to run the gauge. If you, instead, connect pin "C" of your CTS to D3 of the C500 instead and switch the 2 wires at the dash connectors your temp gauge will not peg on startup anymore.

Option 2:
An even easier way to take care of this is to remove and tape up the Dk grn/yellow wire from G1 or G2 (varies based on year) from the ignition switch connector. This will eliminate the bulb test feature. Since most of us are not using a temp light anyway it won't make a difference if we take care of it this way. If you are running the caddy head temp sensor use option 1.

Most of my fieros I don't even bother with this fix. The temp gauge in my 4.9 though, sticks when it pegs and drives me crazy. I just had to fix it. Anyways, thought I'd share.

[This message has been edited by Fieroseverywhere (edited 07-02-2009).]

[This message has been edited by Mickey_Moose (edited 08-24-2009).]

[This message has been edited by Carrluvr (edited 08-24-2009).]