5.3 SWAP Wiring Problem
 

I have a 2007 Silverado 5.3 motor and engine bay wiring harness. My problem is finding the wiring diagrams that can help me eliminate the wires and were to hook everything up to get this motor running. I am starting to get frustrated with all the googleing, tying to fix this. I have the fuel system lined out. Cooling system is ready to install, I just want to get it turning over! Please help me figure out the wiring harness.
Thanks in advance,
Shane

Re: 5.3 SWAP Wiring Problem
 

shane.... what part of the board did you want to post this in?
This (burb forum) is probably the last place you'd want it.
There's been a few people who have installed gen III engines in 67 - 72 trucks (I assume thats what you are working on since you never said)
We need some more info, and i can move it to the right forum upon figuring out what it is you need.

Re: 5.3 SWAP Wiring Problem
 

CRAP!! It was suppose to be in the Engine and Drivetrain Forum. My bad, can you move it to that section. I have a 72 chevy truck. it really does not matter if its burb or truck. I just need the help. Thanks for looking out.

Re: 5.3 SWAP Wiring Problem
 

done.

Re: 5.3 SWAP Wiring Problem
 

Years ago I bought a book at NAPA that had all the engine wiring diagrams for most all vehicles. I haven't looked to see if they have a newer edition that covers the newer year vehicles. It might be worth a look. There is also a wiring conversion book on ebay. I haven't bought it, but I thought I'd mention it so you can check it out if you like.

http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT

Re: 5.3 SWAP Wiring Problem
 

Need you to be more specific. Auto or manual trans?

Also, seriously...think about the time and frustration you've dumped into it already. Why not send your harness to Speartech (http://www.speartech.com/) and have them rework it for you? What you get is something (usually) better-than-home-hacked with zero effort on your part. There are cheaper ways to do it, but ... This is pretty much one of the best, albeit pricey, methods.

If you really insist on doing it on your own, LS1tech is one of your best resources.

http://www.ls1tech.com/forums/conver...-diagrams.html

You'll need to sign up. I'm over there, my username is almost the same over there, only there's a ` at the end (shifty`)

Re: 5.3 SWAP Wiring Problem
 

I know speartech is good but they are pricey. Waitf4meperformance is cheaper for redoing the oem harness. It is not as nice looking as Speartech but it should work. I just got mine back from them. They charged $360 for rework my oem harness and tune. I do not have it installed yet to show any pics.

Re: 5.3 SWAP Wiring Problem
 

I used W4Me also. After seeing both the Speartech harness and the W4Me harness, all I can say is ... you get what you pay for.

The W4Me harness worked fine also, although the instructions weren't exactly provided to explain how to hookup, so I had to ask 5 million questions. The Speartech harness was so simple, plug and play, clear instructions, all relays present for fuel pump and fans, etc.

I dunno. If money is no object, I would have probably go Speartech. It would've saved me several hours of cleaning up and work.

Re: 5.3 SWAP Wiring Problem
 

Are you just looking for the pin-out locations on the PCM? If you still need them on Tuesday, let me know and I'll send them to you. I can get them at work.

Re: 5.3 SWAP Wiring Problem
 

Well, I sent my harness to Wait4meperforance and thy did an awesome job. I had alrady purchased fuel pump and electric fan relays. So, they pu me some drops of the harness to connect the relays to. easy and painless. It was easy to connect everything. Thanks for the information and assistance

Re: 5.3 SWAP Wiring Problem
 

Well, I finally had time this weekend to install the harness, AND i'm frustrated again. I have everything exactly as Wait4me explained it. and labeled it. Except for the oil level sensor, I can't find it. before you go saying it. I have looked everywhere on the passangers side of the block and oil pan and it is not on my engine. Can this bebypassed and will it start without it connected

Second, The engine will not start. NO SPARK. I have fuel (plugs are wet with fuel) and it turns over but I can not get it to spark! Checked all my grounds and they are good. For some reason the PCM is not telling the coils to fire.

Any ideas?

Re: 5.3 SWAP Wiring Problem
 

Who did your reporgraming?

Re: 5.3 SWAP Wiring Problem
 

Wait4me Performance. I'm thinking the VATS was not removed.

Re: 5.3 SWAP Wiring Problem
 

Even it the VATS wasnt removed it should start up for like a second or two then shut down... Let me do some thinking....

Re: 5.3 SWAP Wiring Problem
 

Is the crank sensor plugged in? (its behind the starter)

Is the cam sensor plugged in? (its behind the intake)

Re: 5.3 SWAP Wiring Problem
 

Thanks, for the replies. I tried to find the crank sensor, but can't locate it. The cam sensor is pluge in.

Is the crank sensor between the starter and the block? because I have been all over that side of the engine and can't find were it plugs in at??

Re: 5.3 SWAP Wiring Problem
 

Its right behind the starter solenoid, heres a drawing.

Re: 5.3 SWAP Wiring Problem
 

Thank you Clinebarger. That sucker is hidden! But still no start. However I have figured out that when I turn my key to start. Something is shorting out and droping my voltage to 5-6 volts. So I disconnected all the dash battery hot wires and thats as far as I got. Probably won't get back to it till Saturday evening.

We have a bunch of new Chief Petty Officers and it's TRAINING SEASON!!! You ex-squids know what I'm talking about! LOL :fry:

Re: 5.3 SWAP Wiring Problem
 

move this sucker to the LSx swap forums already! -- :D

Re: 5.3 SWAP Wiring Problem
 

Bad connection? Dead battery? Do you have a battery charger hooked up to keep the battery charged.

Re: 5.3 SWAP Wiring Problem
 

Jim, I already tried to move it, but got my butt chewed for double posting.


Clinebarger, I do have a charger on the battery, charging it for when I do get a chane to get back out there and work on it some more. The battery is good, just needed a little juice. I do have a bad connection, it appears it's shorting out something and dropping my voltage, when I hit the ignition swithc to start it. I'm sure i'll get it figured out this weeked.

Re: 5.3 SWAP Wiring Problem
 

OK, Hooked up the Crankshaft position sensor, CHECKED ALL my ground wires again, and still nothing. Got the Battery checked at the auto parts store, had to charge it from cranking it so much and still nothing. I have fuel but NO Spark. I don't get it. And to top it all off, I only have sundays to work on it. Soooo, calling Wait4me Performace on sunday is out of the question, and trying to call them on a week day and get one or two ideas then wait till sunday to work on it again sucks!!!

I'm about one second away from selling this POS project!

Re: 5.3 SWAP Wiring Problem
 

When you say you got "fuel" are you talking about just pressure only, have you verified that the injectors are pulsing?

07 is a split-year. Did this engine come from a old or new body truck?

The best advice I can give is for you to calm down, The truck is worth more when its running;)

Re: 5.3 SWAP Wiring Problem
 

I think it's the new body style, my VIN is 2GCEK13Z071141116. If anyone could decode that and tell me I would appreaciate it. I have fuel in the cylinders, the plugs are wet. Wouldn't the injectors prevent fuel from getting in the cylinders if they were not pulsing?

Re: 5.3 SWAP Wiring Problem
 

It came out of a 2007 Silverado Classic 1/2 ton 4X4 crew cab with a Flex Fuel (L59) 5.3L. (old body)

There are two grounds behind the intake by the cam sensor. Are those grounded? #2 & #4 are the grounds im talking about #3 is the camshaft position sensor

Re: 5.3 SWAP Wiring Problem
 

Yes they are both connected, I have been Coresponding with Jesse at W4M, he said to check the harness, make sure all the pink wires have 12Vdc, funny... I sent it to them to get it fixed in the first place, didn't think I would have to double check there work! If that was the case I would have done it myself.
I found Three grounds, the two in the back pf the engine, that you pointed out, and one on the front, behind the Power Steering pump. Then My Chasis, Engine, Body and Battery Ground straps.

Re: 5.3 SWAP Wiring Problem
 

Would it possibly need a crank relearn procedure done for some reason?

Re: 5.3 SWAP Wiring Problem
 

It might, How do you do that? I don't have a check engine light to view any codes. Any idea's how to rig one up?

Re: 5.3 SWAP Wiring Problem
 

What fuse box are you using for your harness. Verify the fuse is good/ there. Verify connectors at the fuel rail are connected good. This is the connector on each side of engine that connects coil harnesses to engine harness.

Re: 5.3 SWAP Wiring Problem
 

I'm using the original 72 fuse block with an inline 15 amp fuse to the harness then a 10 amp fuse to the ECM/PCM.

Re: 5.3 SWAP Wiring Problem
 

some reading on it:

http://www.trifectaperformance.com/t...ankrelearn.htm

Re: 5.3 SWAP Wiring Problem
 

So, based on this I'm screwed. It is not the original PCM for my Engine, But it is a PCM for the 2007 and 5.3ltr engine. This tells me I have to buy a tuner that will initiate the Relearn program or take it to a Stealership to get them to do it. However, I can't do that until I get it started. Also, according to this it will still run but not run very well? It will just throw the code.

Re: 5.3 SWAP Wiring Problem
 

I dont know if this will help you but my swap had the same issue, however when I found one of the W4Me supplied harness power needs was a constant 12v through the key on and start process was lacking, I put one from the fuse box and it started and ran. I used the W4Me harness and sort of stock truck harness along with the fuel pump and fan relays. Hope it helps.

Re: 5.3 SWAP Wiring Problem
 

What fuse box are you using in the engine harness. Theres fuses for the injectors and coils and other various systems in the engine harness. It requires some kind of fuse box such as the under hood fuse box from the donor vehicle or an after market one from Current performance. Check the fuses in this fuse box to verify good, or there/installed.

Re: 5.3 SWAP Wiring Problem
 

you can send your PCM and VIN to a good tuner...and they will put the factory loads for your VIN into the PCM...once thats done, they tune it for your individual needs (fuel octane, elevation, reduction of torque management, etc.) before returning it to you. With this done a crank relearn shouldn't be necessary.

ALL of this is one of the reasons I am putting a carb on my LSx. :lol:

Re: 5.3 SWAP Wiring Problem
 

OK here is what happened, Went and got a Scanner and the only codes it's giving me are the HO2S Heater codes. And that should not keep it from running. (P0030, P0036, P0050, P0056) I asked WFM to remove the two they recommended to remove (the back, I think), and still nothing. Jesse swears there is nothing wrong with it. I am severly frustrated! Then he wants me to go buy 4 O2 sensors and leave them hanging to see if it will start then??? They are a little expensive for me to just experiment with them.

Re: 5.3 SWAP Wiring Problem
 

Alright, I went out to double check, I only have two O/2 sensor plugs (W4M remove the two rear ones) but the Scanner is giving me four 0/2 codes. unplugged the MAF sensor and still nothing. Anyone with ideas? Thay haven't been discussed thus far?

Re: 5.3 SWAP Wiring Problem
 

W4m said all i need is the 15 amp fuses on the pigtails they intalled and a 10 amp fuse on the white constant power to the PCM. There are no Fuses to the coils, or injectors other than these.

Re: 5.3 SWAP Wiring Problem
 

OK, he's got inline fuses installed. No bulky fusebox to look at then. Check to verify theres actually a fuse installed in the holder, and that it still is good. Have you checked to verify you have power on the circuits that energize when the ignition key is on and also in the crank positon. It will go through a relay to energize these circuits. With an aftermarket harness I don't know where'd he'd put this relay, but verify it's working. It sounds like it is if the injectors are cycling, but he may have them on seperate relays.

Re: 5.3 SWAP Wiring Problem
 

If you can get some noid lights from somebody, you can check to make sure the injectors are all cycling.