Yea i have those hood wires on the envoy but there isnt one on this one..maybe cause its an LS..doesnt have a lot if things the envoy has.. No drivers information center under the speedometer for example
Power steering line removal and replace
- Thread starter Uncleenvoy
- Start date
Mooseman
Moderator
Mine's an LS. And the Saab, the highest end possible on this platform, had it and I'm pretty sure my '02 had it. I think it's a safety thing because none had the underhood light except maybe the '02.
Maybe the year then..this is an 06..LS is the lower trim correct? I can never remember..or is it LT..this one has the labels removed snd aftermartket chrome trim where the labels would be..and the vin search doesn't say the trim..at least the site im using. www.decodethis.com ..anybody got a good vin search site they like?
Free-Vin-Decoder - Vehicle Identification Number Decoder System
As for the ground strap on the hood. I could never make heads or tails of that. We have nothing in our hood that would require a solid ground. We dont have a sensor in our hood release looking for a ground for a dash light telling us our hood is open. It just doesnt make sense. Maybe it has something to do with the radio antenna, and making sure there is a good ground plain for reception? But I thought that only applied to amateur radio (HAM/CB) not normal AM/FM reception.
@TollKeeper you da man..thanks brother..way more deatailed than the one i was using plus no overkill on ads..is it sad that i l kow the VIN on this thing by heart from all these repairs ive been doing
Mooseman
Moderator
@coolasice Thanx..found this one too..told the guy at the dealership that it was G105 and that helped the guy at gm that he called figure it out..can i connect it to any of those ground locations in your pic
JayArr
Member
I don't know if this will help but here's a pic of the side of the block with nothing attached. The four ground points are circled and labelled.
Notice that the ground points all have little lugs on them, they sort of look like Walt Disney hats with the mouse ears. The connector goes between them if possible so that it won't twist when you tighten the bolt.
Notice that the ground points all have little lugs on them, they sort of look like Walt Disney hats with the mouse ears. The connector goes between them if possible so that it won't twist when you tighten the bolt.
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@JayArr definitely helps..thanx..gonna just look for the hanging eylet at any of those points..would you happen to have a view from behind ..with the flywheel facing the camera? Dealership guy said "back of the head" im looking for G105
@coolasice yeah i know..thats the same pic i meant to add in post #91.. I guess i forgot to attach the file..i just need to find where the other end of G105 goes..inspection camera ruled out those 4 on the side of block..theyre all intact..took of the air box to get better acces to back but not much luck..to hell with it..intake mani coming off..iirc i think the hardest part for me was getting off the bracket that holds the pcm on due to clearance issues..but i got the proper tools now so shouldn't be too bad
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G105 doesn't go to the head... It goes to the t-case shift module...
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@coolasice thanx man..i was just looking thru the wiring diagrams from the service manual that i downloaded from @Mooseman ..im on page 31 out of 101 looking for it..i gotta take a break and take care of some biz..but hopefully i can find it when u get back.on another note i think that pita pcm bracket bolts into the side of the head so maybe i just go buy an eyelet insulate up that wire and put it there..im gonna connect the pcm,batt and connections..touch the wire there and see if itll start..if that does work do u think that will interfere with the pcm one i screw it back on the bracket?
JayArr
Member
Hey Uncleenvoy
I double checked my Envoy and the braided wire from the firewall at G105 goes to the hood.
I double checked my Envoy and the braided wire from the firewall at G105 goes to the hood.
@JayArr my 04 envoy has those same wires going to the hood..but no hood wires on this 06 trailblazer..it definitely goes to the engine block..if only due to the length of the wire itself and this wire harness clip thats on it
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JayArr
Member
The one to the hood also has that clip in about the same place. The difference I see is that there is about 6" of braid loose hanging out the end which makes it look longer and like it could reach the engine head.
Is the inside of the screw point at G104 in the hood painted? This would indicate it was never used. If it's not painted maybe someone unhooked the ground from there to use elsewhere?
You said there was some aftermarket stuff in there before you bought it, maybe someone needed a ground and pulled it off the hood and broke the braid inside the sheathing to get it to reach where they installed something or maybe they even cut it 6" up the sheathing to get some extra length?
If you open up the sheathing and look about 6" or so from the end do you find the other end of braid that goes to the firewall ground G105?
If the braid went back up the sheathing and that end of the wiring went up to the hood it would solve the mystery of where that goes and it would leave the second problem unsolved (no start without ground to engine.)
It may be incorrect to assume that this wire is why the car won't start.
Looking at the manual there should be wires directly from the battery negative terminal to two ground points. One wire to the front fender. One wire to the engine block. Are all those in place? Maybe someone had some sort of theft protection that disconnected the battery ground from the fusebox and they didn't put it back together properly when they pulled it.
Is the inside of the screw point at G104 in the hood painted? This would indicate it was never used. If it's not painted maybe someone unhooked the ground from there to use elsewhere?
You said there was some aftermarket stuff in there before you bought it, maybe someone needed a ground and pulled it off the hood and broke the braid inside the sheathing to get it to reach where they installed something or maybe they even cut it 6" up the sheathing to get some extra length?
If you open up the sheathing and look about 6" or so from the end do you find the other end of braid that goes to the firewall ground G105?
If the braid went back up the sheathing and that end of the wiring went up to the hood it would solve the mystery of where that goes and it would leave the second problem unsolved (no start without ground to engine.)
It may be incorrect to assume that this wire is why the car won't start.
Looking at the manual there should be wires directly from the battery negative terminal to two ground points. One wire to the front fender. One wire to the engine block. Are all those in place? Maybe someone had some sort of theft protection that disconnected the battery ground from the fusebox and they didn't put it back together properly when they pulled it.
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JayArr
Member
Looking at some of the pics you posted I thought that this one looked wrong. Look at the left post of the three, yours has a big thick wire with sheathing. Then look at mine, it has a thin red wire that goes directly into a harness. The GM service manual says there shouldn't be anything there at all. I suspect my red wire is just for an aftermarket accessory, there is only one wire on the post and the post doesn't connect to anything else.
Is it possible that that thick black wire on the leftmost post of your car is the ground line from the battery post that is supposed to be connected to the engine block. That would certainly keep it from starting.
I think someone had an aftermarket alarm on the car and disconnected the ground from the engine block and ran it to the alarm then they ripped the ground braid off the hood and connected it to the head. When the alarm allowed the car to run (it's relay contacts closed) the ground ran from the battery, through the alarm and to the engine through the braided wire. It's a real butchers way of doing things but it probably would have worked.
To get the car back to stock take that black wire off the left post and re-attach it to the block. Then fix the ground braid and run that back up to the hood.
The car should then start.
Is it possible that that thick black wire on the leftmost post of your car is the ground line from the battery post that is supposed to be connected to the engine block. That would certainly keep it from starting.
I think someone had an aftermarket alarm on the car and disconnected the ground from the engine block and ran it to the alarm then they ripped the ground braid off the hood and connected it to the head. When the alarm allowed the car to run (it's relay contacts closed) the ground ran from the battery, through the alarm and to the engine through the braided wire. It's a real butchers way of doing things but it probably would have worked.
To get the car back to stock take that black wire off the left post and re-attach it to the block. Then fix the ground braid and run that back up to the hood.
The car should then start.
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Mooseman
Moderator
That is incorrect. That is the infamous "disconnected red wire" for 12v at the trailer connector. @JayArr , yours looks to be connected correctly. @Uncleenvoy , yours is definitely the wrong wire there. I'll bet the trailer power supply fuse is also blown. If that is supposed to be the ground wire, then that's your issue.
Red Wire (The disconnected ring connector near battery/underhood fuse box)
JayArr
Member
Well you learn something new every day. The manual doesn't put any label on that stud so I thought it wasn't connected to anything.
Thanks @Mooseman. BTW - what is this OS that is spoken ill of? Some "old site" you were all on before this one?
@Uncleenvoy
I think so. It's a pain to take off the first time but if you clean the threads and use some never seize it goes back on OK. I've done it a few times and it gets easier. (you need to remove it to swap injectors) It should be easier to put that ground back on the block with the intake manifold out of the way.
@JayArr the intake mani wasnt that hard its just that last bolt closest to the firewall thats a pita..took it off on the envoy b4 when i had a gasket leak..used the swivel socket to get it.getting it back in should be quick..one thing though..the fuel line is different from the envoy..i had to go buy a line removal tool..on the envoy i just unscrewed those 2 torx bolts and got it off..traiblazer doesnt have that part
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JayArr
Member
There are two versions of that rail, earlier Envoys have a single rail with no return line and later ones have the return line to the tank. One has a regulator on the rail and one doesn't.
It was a Sunday when I first encountered this and I didn't want to wait until Monday to buy a tool set so... you can undo those gas line connections by taking 1 inch of copper plumbing line and cutting it into two halves. Put the two halves around the line and push them into the connection and they'll release the line.
It was a Sunday when I first encountered this and I didn't want to wait until Monday to buy a tool set so... you can undo those gas line connections by taking 1 inch of copper plumbing line and cutting it into two halves. Put the two halves around the line and push them into the connection and they'll release the line.
Mooseman
Moderator
We can speak of that site. It's TrailVoy. We don't refer to it as much anymore since we have now amassed just as much, if not more, info than them now. We were using it as an archive of sorts but it's basically a ghost town now. Long live GMTN!
Welcome to GMTNation.com! Here's the story...
I just sold it to a neighbor for $3000....i added up those reciepts..im in for just over $2000 including the purchase price...2130 or 2160 or something like that i cant remember.gotta hurry up and put her back together and test drive..they want it by friday..hope that fuse was the problem
JayArr
Member
I've bought one of them since but on that Sunday it was "invent a tool or stop" I knew what the tool looked like from google and that's how I figured out that the copper pipe would work.
Great on the sale. Get the bolts back in and get it out of the driveway.
Trailvoy is the OS? I'm a member over there, I found that site before GMTNation but it's too quiet over there. Now I know why, all the gurus are over here. LOL
Great on the sale. Get the bolts back in and get it out of the driveway.
Trailvoy is the OS? I'm a member over there, I found that site before GMTNation but it's too quiet over there. Now I know why, all the gurus are over here. LOL