951Tom

I've had a annoying problem for the last year or so where my car wouldn't start occasionally, it would just crank and crank and maybe a few mintues later it would start and always run fine. It happened again this weekend so I jiggled the speed & reference sensor plugs and it started right up!! So I decided to peel back the rubber boot and low and behold the wire insulation was cracked and probably grounding itself to the ground shield wire. So I've ordered new plugs from Eagleday.com. Just a FYI for you guys with wierd running problems, pull back those rubber boots on the connectors and have a look, you'll probably find a mess like I did.

Tom
'87 951
'86.5 Supra

Missin2

sounds like my car..

where is that plug/sensor?

hosrom_951

At the rear of the engine, above the bell hosuing.

Tip, when installing new connectors, try insulating them from the heat.

PorscheDoc

Use to happen all the time, put in a new wiring harness after trying and failing to put on new ends. Now it is starting again with the new harness.....doh!

Tom M'Guinn

Have you checked the connections under the relay box?

PorscheDoc

No it is the wires on the wiring harness side. It was fine for a year, but now the other harness (which was used, so what do you expect) is doing the same thing. I littlerally just have to touch the reference sensor connectors and it starts right up, so it isn't that bad yet, and only does it once in a great while. The other harness would do it every other time i started my car, and when i tore apart the harness, 2 of the 3 wires were broken clean off the connector on the harness side.

When it gets bad, i will rip out the 3 wires to each connector in the wiring harness, and run new wires to the DME and then wrap it in tinfoil (acts as the shield i am told) and heatshrink it all.

theedge

Just use actual shielded wire... Thats all the stock stuff is, two little wires with the braided ground around it. Nothing at all fancy/special until you consider the damn connectors at each end.

PorscheDoc

Where can you get it? I had tried to find some about a year ago and couldnt find any, though i didn't really know what i was looking for either, lol.

IanS

What plugs did you order from Eagleday.com? I can't find any 3-pole male connectors, which is what is broken on my reference sensor.

-Ian

tammons

My car does that all the time.

951Tom

IanS, I didn't see any 3 prong male connectors on their site. Your only option may be new speed/reference sensors....or splice the wires directly to the factory harness.

Since my original post I've received both the Eagleday.com and Kayjayco.com connectors and either will work fine on a OEM harness rebuild.

Tom
'87 951
'86.5 Supra

IanS

Well, it looks like I'll be using some epoxy in the near future. My connector is just broken not damaged.

However, this post was extremely helpful, since my car wasn't starting yesterday or today, and now it is, because I used a rubber band to temporarily secure the connector.

-Ian

theedge

http://www.rs-autosport.com/

Second or third thing down, theres a pic. Im going to order some up, and some connectors from Eagleday and add new stuff for the speed and reference sensors.

MPD47

I've posted it before, and I'll post it again. If your connectors look like this (below), your car will not run 100%. And it's pretty much somewhere on your car one of them has deteriorated to this point unless it was garaged all it's life or rebuilt.

Alpine951

This also applies to the injector wires at the connectors. My car ran crappy on boost. Belched black smoke. Danno helped me diagnose it to the injector wires. I saw the same thing when I cut away the rubber boots. New updated pigtails at NAPA and now it runs awesome.