73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Fuel Systems and Drivability => Topic started by: Corkey723 on November 18, 2009, 04:49:59 pm
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I need some help from you guys out there. On my project truck, someone cut off the wires for the throttle body and also about 4 or 5 pink/black wires. I got a connector and pigtail out of another truck but it looks like its different.
Now i dont know what the stock wiring looks like. Does anyone have a diagram or pictures of the wiring on an 87 R10 350. I need to know where the other 2 wires go. The pigtail I have has a green and blue wire on it, and I can match those 2 up, I just need to know ehere the other 2 wires run to. Thanks in advance.
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There should be 4 wires going to the injectors. Blue and red. Then Green and white. Now what other wires are cut? Take a pic so we can see.
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(http://lh3.ggpht.com/_G5cDsRAJSZA/Su7fcvgiCdI/AAAAAAAAEA8/Ha5c92WmaP4/s800/IMG_2086.jpg)
This is the best pic i have right now, i can get better ones if you need them. I have a harness with wires that are braided in 2 pair, they were cut off a junkyard motor by a friend. The cut wires are pink/black, blue, and green. I cant find any other cut wires (the red and white ones) Do they run somewhere else or all into the computer, because i pulled the wire loom and didnt see any other wires.
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I guess that last post wasnt very clear, now that i read it. I have the throttle body connectors and the 4 colored wires coming off of it like you said. I also have the blue and green wires in the picture that i know they hook up to. Its just i cant find where the other 2 colored wires go, the red and white wires. Are the pink/black wires all for the air pump system, because thats been eliminated.
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I'm not following you. You have 2 injectors with two wires going to each. They should be twisted in the harness. One set is a blue and a red wire the other injector is a green and a white wire. What else are you missing?
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i was missing the wires on the truck when i got it, someone cut them off. The picture above are the wires i'm missing, 4 pink/black wires, and the blue and green tbi wires. I got the throttle body connectors with wires coming off of them off another truck. The only two wires i can see on my truck are the blue and green wires that run to the computer. I dont know where the other wires go to, the red and white.
Bacically I need to know where the red and white wires go coming off of the injectors, because they dont seem to run to the computer.
Im trying to explain this the best I can, just ask if your confused on something
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I don't know how much this will help. This is all I can do while sittin' on my couch, going thru pic files of past projects I did on my '91 sub. I had to replace one of the two TBI injectors from a donor, by splicing the wires and such. Here's a link to that job. (http://forum.73-87chevytrucks.com/smforum/index.php?topic=5280.0) Here are some pics.....If needed, I can go out and take some pics following them a bit more if that will help, but, it is raining right now and don't feel like gettin' out in the mess.
i put yellow arrows signifying the four wires as they come out of the TBI unit.
(http://www.delbridge.net/tbi09a.jpg)
(http://www.delbridge.net/tbi09b.jpg)
(http://www.delbridge.net/tbi09c.jpg)
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Ok, I have the connectors and about 3 feet of wire with all the wires there. On my truck now, someone cut all the wires in the same place. I can only find the blue and green wires that run to the computer. According to the diagrams I have found, there is a pink/black wire running from the fuse box for the constant power, which then splits off into the red and white wires for the injectors. I just need to know where that is so I can splice my red and white wires in to get power. The green and blue are the ground control wires (what turns the injectors on and off, controlled by the comp.) If worse comes to worse, ill wire my own ign. controlled wires for the injectors. I hope im being clear enough.
P.S. this wiring problem is driving me up a wall. I wish people werent pecker heads and cut stuff off like this. :o Excuse my language/rant. lol
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I'm still not sure what you're going off of. Maybe this will help:
(http://i6.photobucket.com/albums/y228/Sabaka454/eng1.gif)
(http://i6.photobucket.com/albums/y228/Sabaka454/eng2.gif)
(http://i6.photobucket.com/albums/y228/Sabaka454/eng3.gif)
Full size click 1 (http://i6.photobucket.com/albums/y228/Sabaka454/eng1.gif)
Full size click 2 (http://i6.photobucket.com/albums/y228/Sabaka454/eng2.gif)
Full size click 3 (http://i6.photobucket.com/albums/y228/Sabaka454/eng3.gif)
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Sorry, it just doesnt seem like the wires were twisted together before, and they were all cut at the same place, no red and white wires to be found, even at the firewall. I know the newer trucks were twisted to the computer, that is what my donor harness is out of. i was just thinking, and looking at other wiring diagrams, that the red and white wires were tapped off another connector somewhere. Here is a diagram I found for an 88 350 TBI. http://media.photobucket.com/image/chevy%20tbi%20wiring%20harness/RFmaster89/TBI%20retrofit/TBItruckoverall.gif (http://media.photobucket.com/image/chevy%20tbi%20wiring%20harness/RFmaster89/TBI%20retrofit/TBItruckoverall.gif)
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anyone have a diagram or pictures of the wiring on an 87 R10 350.
This is what you asked for so this is what you got. Is your ecm and harness from an R/V or a C/K?
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The truck is an all original 87 R10. Thank you for the diagrams, now i'm hoping for a picture or something. Would I be better off getting a full harness from someone. Or could I possibly just run a 12 ign controlled wire to the wires. This is making my head hurt.
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So this is an 87 R10 5.7L tbi and someone cut off a bunch of wires and you don't see the diagrams I posted matching up?
Or could I possibly just run a 12 ign controlled wire to the wires
What does this mean?
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Could I run a wire to the red and white wires that is hot when the ignition turns on. Sorry, i'm not new with wiring stuff, just having trouble with this specific problem seeing as I don't know what its supposed to look like.
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if you simply run an ignition controlled 12 volt wire to it, what will control the fuel amount? I would think that is why the TBI is connected to the computer. I would think many factors go into the fuel amount such as throttle position, A/C, etc...
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Yes, but it seems to me like the injectors are controlled on the ground side from the diagrams ive seen. Its grounds the wire to complete the circuit, same as putting voltage to one side. Im sure most of you know that though. Im just trying to figure things out. I looked at the harness near the firewall and didnt see the red and white wires. Im so lost at this point, I dont know what to do.
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OK take a deep breath. Let me explain this to you.....
Do you have both connectors for the injectors?
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yes, i have both connectors and about 3 feet of wire off each of them.
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On inj #1 the red wire and on injector #2 the white wire go to a splice. That splice is the pink/blk wire that is circuit 439 and goes into the bulkead connector. This is B+ to the injectors... capische?
OK now on inj #1 the lt blu wire goes back to the computer ckt # 467
inj #2 the lt green ckt 468 wire goes back to the computer also. These are the injector drivers.
Now what else are you missing?
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Ok, the blue and green wires arent a problem, im just gonna solder them on the wires that are there already and easily visible. Now where is that splice to the pink/black wires at, because like I said earlier, i have 4 pink/black wires someone hacked off too at the same point as the green and blue ones. This is what im trying to find, is where I need to splice the white and red wires into, and it be correct. Where does the pink wire end and the red and white ones begin.
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Go over to the bulkhead connector and trace this wire: ckt 439
(http://i6.photobucket.com/albums/y228/Sabaka454/bulk.gif)
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Now is that the harness for the computer i take it. Sorry, its getting late, so ill do this tomorrow i hope.
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No that goes to the bulkhead connector not to the computer. The bulkhead connector comes through the firewall on the drivers side. You can't miss it. It has a bolt holding it to the opposing side directly in the middle and is square shaped.
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Well, i went over today and looked it over. Tore into the harness and found the 1 power wire coming from the power block. Was a pain in the ass and I realized its 1 power wire frrding about 7 wires. Is there a connector that these all connect to, like a special splice thing, so i can do it like the factory. Or could I just get a little power splitter block type thingy and run the one wire in to all the other wires. Thank you again Vile, that was all I was looking for was where to look at to start.
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Follow the pink/blk wire from the bulkhead connector through your harness to the factory splice.
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Yeah, whatever used to be there is cut off, thats where the splice is/was. They cut all the wires to get the throttle body wires off.
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They cut the wires off at the bulkhead connector?
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No, up where the splice is by the engine connectors, like the maf sensors and all that. I didnt know how they were spliced together from factory, Im just trying to do it the best way I can.
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Then do like I said and trace the wire from the bulkhead connector to the harness where it's cut.
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I did, up to where the wire was cut. It was cut where the splice is. The splice is no longer there. How were all the wires spliced from the factory. This is what I need to know.
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With a splice clip.
(http://ocw.weber.edu/automotive-technology/ausv-1320-automotive-electronics/images/SolderingSpliceClipPhoto.jpg)
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so how does that work since it splits into about 4 or 5 wires
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Just join them all together at the splice
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can do, That will be my project today, as well as getting the fuel tank all buttoned up, exhaust manifolds put on, ad plug wires on, maybe have it running by the end of the weekend. I doubt it but we'll see. :D
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good luck. We're following your progress.
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Thats cool, I got the wiring joined together temporarilly, and the tank back in. Have to take the studs out of the manifolds somehow, they are rusted and just junk. Then clean up the mating surface on the head and bolt the exhaust on. Then some basics and see if the motor will run, im gonna hold off on the oil pump till after its all running.
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Well this is for anyone who cares. IT RUNS! lol, i'm too happy right now. it doesnt run the greatest, plus the manifolds arent bolted on tight (bolts are too long, my bad) I just have to get an o2 bung for the headers my buddy gave me. Now some little bird told me to not go with gaskets and to just use red RTV on the headers. Now is this a better idea, i dont want to second guess him but i wanna get a second opinion, or what kind of gasket should I get. And thanks to you guys on the help for the wiring. Ill have a pic up once I get the headers on.
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I used to soak my header gaskets in water over nite, put them on and run it. Doing that maybe made them last a little longer. Parts houses sell the copper or alum gaskets that work better. The trick is not to over tighten the bolts.
Hey Vile you have any engine harness diagrams for a 92 454? I ordered a few books and that one ain't come yet.
Steve
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reg silicone would last about 5 min on a set of headers. Just use some paper gaskets and soak em like they said above, and check the bolts 4-5 times over the next couple of weeks, header bolts don't back out, its the gasket that shrinks and then the bolts are loose.
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and this will work ok with the felpro gaskets, since I was told they had a steel core in them. I have to cut the old exhaust sometime this week and get the headers on to figure out where I need to put my oxygen sensor bung at. There shouldnt be any clearance issues on an 87 2wd 700r4 shift cables, right? theyre long tube btw, not sure the brand, came off a buddys 85 scottsdale 4x4.
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The only RTV you should use on exhaust components is ultra copper
(http://www.autobarn.com.au/AB_images/products/images/prod_1197430262.jpg)
Red and blue rtv is garbage. We have Permatex training anually and they'll even tell you NOT to use it. The preffered for most everything else is the right stuff.
(http://i258.photobucket.com/albums/hh275/sbparker01/rightstuff2.jpg)
The exception would be components you plan to take apart again in that case use ultra black
(http://www.getprice.com.au/images/uploadimg/1277/350_113949.jpg)
My advice would be just get a good quality set of gaskets and install them dry.
Steve: start a new thread on what you need and I'll get you what you need.
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Personally I have NEVER seen any silicon type stuff that worked on exhaust . Gaskets always work with the exception of the intake end seals and yes "The right stuff " is the best thing for that application.
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Ultra copper works awesome on exhaust connections. If you have a warped flange or even an emergency repair it works great. Some racers run a bead on their gaskets and let them cure, then they do it to the other side and let it cure. They make a tight seal and come back apart eaily after the fact.