DME Temperature Sensor Wiring

[LAURIER]

On my '83 944 I noticed that the wiring harness to the DME temperature sensor had been spliced and taped up. When I removed the tape I found that someone had soldered a resistor in line and the connector looks like it was originally for something else (has extra wire). Car runs okay but it idles a little rough.

Anybody know why this was done? Should I replace the sensor and remove the resistor? Also, does anyone have an old harness I could get the correct connector and about 4 " of the wiring, please let me know.

[S ECU Repair]

Hi , there should not be any resistors attached to that wire ,seems like someone was trying to fool the signal to the DME .

[porsche4life]

Thats a cute trick....

[smokin_944]

Originally Posted by S ECU Repair

Hi , there should not be any resistors attached to that wire ,seems like someone was trying to fool the signal to the DME .

OK, I'll bite...fool the DME to do what?

[Slam]

Hmmm... So the car would run richer with the DME spark timing hotter?

[Techno Duck]

The wiring with the resistor was probably meant to keep the DME running in its warm up mixture, basically running rich. Likely to mask other problems. I would just cut the resistor out and resplice the wiring together and buy a new DME temp sensor.

That sensor only tells the DME when to switch fuel maps and start using the O2 sensor, nothing more.

[cjpacitto]

Yep, someone was definitely trying to trick the DME into producing more power.

You can buy those connectors here: AMP Connectors and Terminals

Note that the "AMP Junior Timer" connectors are the same as the stock ones with the clip that is a pain to remove/replace. The "AMP Junior Power Timer" connectors are interchangeable and use a quick relase spring clip that is much easier to install/remove.

Also note that if ordering from Eagle Day the "Junior Timer" kits come with boots but the "Junior Power Timer" kits do not (you buy the boot separately).

I just finished rebuilding my wiring harness and have some connectors left over. If you are interested, I could sell you a 2-pole female "Junior Power Timer" kit with a boot for $12 shipped anywhere in the US. If interested, please PM me as I don't have time to check this board every day lately.

[cjpacitto]

I wouldn't necessiarily buy a new temperature sensor. you can test that one easy enough if you have an ohm meter and a thermometer.

at 32 degrees F it should be about 5000 ohms
at 100 degrees F it should be about 1100 ohms
at 212 degrees F it should be about 180 ohms

Use a pot of water (with ice, low heat, and boiling) to achieve the required temps. Suspend the temp sensor in the water and let it stabilize for a few minutes, then measure its resistance.

[HWgeek]

A much less expensive place to get the connectors, is Onlinecomponents.com | Franchised Distributor of Electronic Components. They stock 2,3,4,5,6 and 7 terminal variations. Along with the terminals, wire plugs etc..

They're made by TE Connectivity (Tyco Electronics). Pricing is between .70cents and $3 per, depending on size.

Don't work for them, just had some issue with buying the 6pin from eagle day - price was way to high.