User 52121

Strange. I could be mistaken but those look like the spots where the factory trans cooler connects.

User 52121

Please don't take offense to this but after reading your posts and seeing all these pictures of mismatched parts (N/A gauge cluster, late engine harness, trans cooler blocked off?), the thought that keeps popping up in my head is, "What the hell did this poor guy BUY???"

I hope you got a good deal on this thing!

951rook

no offense takin, my thoughts are the exact same. like i said ive never dealt with porsche, i had no clue what to look for. It drives great, just had some simple, or what was thought to be simple, electrical problems. i think im figuring things out slowly

951rook

bought it for 4 thousand, sounded like a good deal at the time haha

CyCloNe!

4k isn't that bad, but you could have bought mine not to long ago for that. I was on the verge of selling but I just did 2,500 in maintenance since last fall and decided to wait

Hopefully your issues will be easy fixes just requiring a little time.

951rook

the problems are slowly working out. just got the tach working by splicing the 4 pin and 8 pin together. however, the colors on the 4 pin were as follows:

4 Pin Connector 1986
1 - White/Green - Fuel Consumption - DME 11
2 - Green/Black - Ignition Pulses - Tacho - DME 21 & KLR 9
3 - Red/White - Boost Gauge - KLR 5
4 - Red/Green
What does the red/green go to? I would expect a ground to be coming from the 4 pin, any thoughts?

cruise98

I agree with Jim on the block off plates being for a missing transmission cooling loop.

Bri Bro

Oil cooler coil must have been removed. I hope they took out the pump when they blocked it off.

951rook

....me too. any easy way to tell?

951rook

is there a way to tell if the speedometer sensor is working?

Bri Bro

Pin 4 is ground and goes to one side of the boost gauge. Pin 3 is the boost gauge signal and goes to the other side of the boost gauge. One thing, 86 had a 4 pin connector, 87+ had an 8 pin connector.

951rook

i have already spliced the connectors, the tach works great. just down to the speedo as far as the gauge cluster goes. is there any reason why the speedo wouldnt work if it was on jack stands, i wouldnt think so but just want to make sure. i put the car in gear... obviously.

cruise98

Connect the wires as follows:

White/Green to white/green
Green/black to green/black
Red/white to blue (tach)
Red/green to brown

They changed the colors between the interior harness and the DME harness for some reason. The speedo signal does not come from the DME or the 4 pin connector. With the cobbling of the transmission, first check to see if the sensor is connected to the transmission.

951rook

ah yes, the sensor is connects. i unplugged it and plugged it back in, unfortunately it wasnt that easy haha. where is that speedo wired routed?

cruise98

Not sure of the routing layout.

At the connector

pin 1 green/white is switched power from the central electric board
pin 2 blue/red, connects to the gauge cluster
pin 3 ground wire

i would check for voltage and continuity at the connector first. If the wires are good, it is either the gauge or the sensor. I would suspect the sensor first. Happy hunting.