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| BCinKC | 94 LT1 wiring questions | ||
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Guru Newb
 
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Having a couple of problems and wanted to get your opinions on these.
Before I start here is a little history on the car. Transmission was rebuilt recently and the heads were removed, checked, surfaced and reinstalled. Seems that a lot of wires were loose, unhooked or broken during those repairs. Amazing how many problems you can solve by hooking up 6 ground wires, plugging in a couple of relays and tightening the trigger wire on the starter. Also amazing that people that call themselves pros did the damage. I think I am getting close to getting the wiring back in order but I found a couple of things that I hope someone has seen before. On the passenger side head there is supposed to be a temp sensor. The connector is still there but there is no sensor. This is the connector that goes through a metal shield and then sits nicely on top of the exhaust manifold when there is no place to plug it in. I find a tapped hole in the head (about an 1/8 pipe thread) where it should be but no water comes out so I assume it is not the correct spot for the sensor. Over on the drivers side, near the front of the head there is what feels like a larger (1/4 pipe?) allen head plug. Any ideas what is going on? Could it be they replaced a head and used one off of a different year? Or is there a right & left head? One other thing that I am having a hard time finding in the Helms manual - Passenger side wiring harness comes out of the firewall, splits a few times and one section goes down to the O2 sensor. It appears I have a second connection way up by the head that has the same exact plug as the O2 sensor. Any ideas where that might go? |
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Posted on: 2010/7/5 22:42
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| bogus | Re: 94 LT1 wiring questions | ||
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Grand Imperial Pooh-Bah
 
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wow... I wish I had some pictures.
However, I will try... 1. the coolant temp sensor belongs on the right head, between #6 and #8 cylinders. So you have the right connectors, wrong sensor, apparently. it should be a 1/4" NPT fitting. 2. I am wondering if you are talking about the optispark harness. It would rest between cylinders #4 and 6. IF you can throw up some pics, that would help a lot. |
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Posted on: 2010/7/5 23:12
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| BillH | Re: 94 LT1 wiring questions | ||
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The Stig Moderator
 
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Quote:
That second connection is probably for the the temp. sender. It should be routed behind the exhaust manifold. Attach file:  IMGP0815.JPG (0.00 KB) IMGP0816.JPG (0.00 KB) |
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Posted on: 2010/7/5 23:53
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| BillH | Re: 94 LT1 wiring questions | ||
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The Stig Moderator
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I don't quite follow that,Andy, the part about between 4&6. The opti harness comes out of the fire wall just above the intake (thru a clamp on the intake) and lays on top of the intake. |
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Posted on: 2010/7/5 23:56
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| BCinKC | Re: 94 LT1 wiring questions | ||
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Guru Newb
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So here is what is left of the plug for what I believe is the temp sensor.  Here are the other two connectors. I know that one goes to the O2 sensor but not sure about the other.  I stretched them out to show the length. The longer one goes to the O2.  This is the front of the drivers side head. If this were around on the passenger side I would just need to take the plug out and insert a sensor. Unfortunately the head on the passenger side does not seem to have the same hole.  Hope that helps. Wiring is hard to describe and even harder to understand someone else's description. |
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Posted on: 2010/7/6 0:39
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| BCinKC | Re: 94 LT1 wiring questions | ||
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Guru Newb
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Hey Bill that is the connector I have - just no where to plug it in.
 I have a rather small hole in the head right there that does not leak water so I'm not sure what is going on there. |
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Posted on: 2010/7/6 0:46
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| Aboatguy | Re: 94 LT1 wiring questions | ||
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Senior Guru
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The same casting is used as a Left or Right head s...
Both ends of the head are tapped for the steam tube...whatever side ends up on the front gets pipe plugs. So long story short...there should be...no there has to be a hole or plugged hole for your temp sensor.....If the plug is between the front pair on the drivers side ....the hole will be between the rear pair of cylinders on the passanger side. Mike |
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Posted on: 2010/7/6 0:54
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| bogus | Re: 94 LT1 wiring questions | ||
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Grand Imperial Pooh-Bah
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Quote:
the harness connection rests between intake ports #4 and #6. However, this thing is a kludge. First off, the head temp sensor isn't relevant. If it isn't leaking, life does go on. As for harness positioning, IIRC, the opti harness does NOT come up out of the firewall, it comes out of the ECM. |
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Posted on: 2010/7/6 1:23
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| BCinKC | Re: 94 LT1 wiring questions | ||
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Guru Newb
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Took a little mirror out and figured it out. So there is a plug in the passenger side head as well. The bad news is someone has eaten out the inside of the plug to where it is round. This is going to be a blast to get out considering where it is at. Thanks to all those that chimed in for the assistance.
Anyone have any ideas on the 2 identical electrical plugs? Maybe I could just plug the O2 sensor in and wait for the computer to set a code? |
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Posted on: 2010/7/6 1:25
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Nothing says crappy work like wrinkles in your duct-tape. |
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| vis_croceus | Re: 94 LT1 wiring questions | ||
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Senior Guru
 
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Quote:
Front and rear O2s. |
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Posted on: 2010/7/6 1:28
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94 vert 
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| vis_croceus | Re: 94 LT1 wiring questions | ||
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Senior Guru
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Quote:
Assuming it's an original plug, never removed, you are going to have to remove the head to get that out. If it still sticks up above the head you can use a bolt extractor and it comes off pretty easily. If not, I'd just take it to a machine shop. Option #2 - leave it off (just feeds the dash display). Option #3 - move it to the driver's head. Driver's-side plug can be removed in the car (again, use a bolt extractor.) The F-bodies have it on the driver's head. If I was in the situation you're in I'd probably move it to the driver's head. |
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Posted on: 2010/7/6 1:34
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94 vert
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| vis_croceus | Re: 94 LT1 wiring questions | ||
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Senior Guru
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Double check on that passenger side plug that it is rounded off as opposed to being a new plug with an interior hex.
The aftermarket plugs will sit inside the hole rather than proud like the originals and they have 6 sides instead of the original 4. It would make more sense that the builder removed the sensor and installed a new plug, as opposed to that he started with two mismatched heads with OEM plugs and ground down one plug but left the other alone... |
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Posted on: 2010/7/6 1:38
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94 vert
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| BCinKC | Re: 94 LT1 wiring questions | ||
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Guru Newb
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Quote:
vis_croceus wrote: Double check on that passenger side plug that it is rounded off as opposed to being a new plug with an interior hex. The aftermarket plugs will sit inside the hole rather than proud like the originals and they have 6 sides instead of the original 4. It would make more sense that the builder removed the sensor and installed a new plug, as opposed to that he started with two mismatched heads with OEM plugs and ground down one plug but left the other alone... I got a pretty good look at it with the mirror and it looks like maybe they tried to loosen it with a ratchet and they were sitting in it crooked. At this point I have given up on the things that make the most sense...like Bogus said "this thing is a kludge". If nothing else I think moving it to the drivers side at some point might be the easiest solution. Thanks again for the help everyone. |
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Posted on: 2010/7/6 2:00
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Nothing says crappy work like wrinkles in your duct-tape. |
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| BillH | Re: 94 LT1 wiring questions | ||
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The Stig Moderator
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Quote:
OK Got ya, I was think harness, not the connector. Yea, the harness does come from the ECM, it is teed into a harness coming out of the firewall on the right side, then goes over the intake. |
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Posted on: 2010/7/6 13:25
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Every man dies but not every man lives. |
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| bogus | Re: 94 LT1 wiring questions | ||
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Grand Imperial Pooh-Bah
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Quote:
on a 94? I didn't think they started that until 95. |
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Posted on: 2010/7/6 14:07
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_________________
The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| pr0zac | Re: 94 LT1 wiring questions | ||
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Elite Guru
 
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i just went out to my car. its a 96 and i have a my rear o2's deleted and i zip tied my rear o2 plug up to the harness so it wouldn't get burned up but by looking at it, it seem to literally identical to your setup.. if you would like me to take pics i can text you or email pics from my phone. call or text 845-849-5575. i am free all day. i do have long tubes and no cats but i can pull the harness out and describe to you what was connected to what.
josh |
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Posted on: 2010/7/6 15:58
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96 lt4. 357ci, 11:1, LE 226/232, LE2 LT4 heads, ported LT4 intake, EM Gladiator44, EM LT's, stock exhaust, NX kit. |
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| MK 82 | Re: 94 LT1 wiring questions | ||
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Senior Guru
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96 LT4
Let me know if you need anymore [IMG]http://i244.photobucket.com/albums/gg8/LT496/DSC00245.jpg[/IMG] |
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Posted on: 2010/7/6 16:14
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96 CE Roadster LT4 |
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| pr0zac | Re: 94 LT1 wiring questions | ||
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Elite Guru
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Quote:
ha.. |
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Posted on: 2010/7/6 16:40
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| BCinKC | Re: 94 LT1 wiring questions | ||
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Guru Newb
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That helps a lot right there. I can tell by looking at that picture that I need to route my wiring harness differently. All of the O2 wires are pulled out of that bundle and ran over the top of the V/C.
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Posted on: 2010/7/8 12:14
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_________________
Nothing says crappy work like wrinkles in your duct-tape. |
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