Soooo i was under my car earlier today and i found right by the starter and the oil filter 2 wires that were cut and not going anywhere and i looked arround and couldnt find anything that they would connect to?! so if anyone has any insight on what they do and if they are important ( the car is a 87 GT 2.8 ) and here is a picture. one is green i think and one is black http://s1178.photobucket.co...current=DSC_1688.jpg Its the two wires that are comming from the bundle and heading up
[This message has been edited by Celthora87GT (edited 12-22-2010).]
I might be the left-overs from a DPOs attempt at fixing ground connections. I found a couple wires, like what you mentioned, on my GT. They went to the chassis and just hung loose on the other end. I removed them.
------------------ Jim Martin White '86 GT California
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01:23 PM
phonedawgz Member
Posts: 17091 From: Green Bay, WI USA Registered: Dec 2009
I might be the left-overs from a DPOs attempt at fixing ground connections. I found a couple wires, like what you mentioned, on my GT. They went to the chassis and just hung loose on the other end. I removed them.
So after this post i got really confused as to what was going on what is a DPO? and they are in a large bundle of wires it is one side looks as if it runs to a Y joint in the wires where is got split off from a larger bundle that go to the ECM and the other side i just cant tell
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01:42 PM
phonedawgz Member
Posts: 17091 From: Green Bay, WI USA Registered: Dec 2009
Well actually where the large bundles of wires go I already had figured out.
At that junction in the 2.8 harness a 3 branches come out. One is the fuseable link AND starter control wire. Those both go to the control terminal on the starter solenoid. They are not in a wire cover.
Then there are two more branches both in wire covers. One of the branches has two wires and goes to the AC clutch at the belt side of the AC compressor. The other branch has two wires and goes to the two pressure switches on the back of the AC compressor. Pull on the branch that is not cut on your harness and see if it goes to the clutch (Dk Green and Black are supposed to be the colors) Where ever the non-cut wires go to, well the other one is where the cut wires are supposed to go to.
I believe you'll find that those wires are an ECM grounding pair that run to a ground called G504. They're notorious for breaking because they run directly under the Y pipe to an eyelet in the forward cylinder head on the driver's side. There's also another ECM grounding pair that's tan and black in the same area. The heat from the exhaust leads to them break. Have a look at these pictures to get an idea where they go if they are indeed G504. Just be aware that in these photos, both pairs were broken and the PO soldered them to a single large black wire and ground the large wire to the block.
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04:30 PM
phonedawgz Member
Posts: 17091 From: Green Bay, WI USA Registered: Dec 2009
OK, here's a pic from a spare engine (without A/C). I've pulled the wires from the loom for clarity. What you'll notice is that apart from the starter solenoid, TCC, cold start injector, G503/504, and the oil pressure sender wires, nothing else comes out of the loom at that location. On A/C equipped cars, however, there is a dark green wire (that comes from the ECM) and a black wire (that comes from the high pressure cut-off switch) that come out of the harness in that vicinity and both go to the A/C compressor clutch. Perhaps that's what your broken wires are as Justinbart suggested at the beginning.
(Edit to TCC)
[This message has been edited by Bloozberry (edited 12-22-2010).]
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07:59 PM
Dec 23rd, 2010
Celthora87GT Member
Posts: 1485 From: New Berlin, WI Registered: Dec 2010
thank you so much i think that the wires are in fact supposed to go to the A/C but since i never use my A/C im not to worried about it but still cant get it to start :/
Phonedawg what did you say about the cold start injector? did you mean that the wires could have gone to the cold start becuase if they do then this might be the reason my car will not start ------------------ 1987 Black GT with BIG plans
[This message has been edited by Celthora87GT (edited 12-23-2010).]
If you're talking about the green and black wires that are broken, then they definitely aren't for the cold start injector. The only part of the cold start injector that is in that area is the fusible link that's attached to the starter solenoid (see my picture above).
[This message has been edited by Bloozberry (edited 12-23-2010).]
