Printable View
hey guy's i'am doing a 5.3 4l60e swap and need all the help i can get on how to convert my harness to stand alone. i really want to takle the harness myself. by the way i have every wire for the motor and harness is there up to the junction box plug. your help will be appreciated. my fuel will come from a modified 91 sending unit. thanx!!!!
here are some pics of the old rust bucket . the engine and trans are in . modified the 91 sending unit with a 01 tahoe fuel pump works great. the truck needs work,but i need to get it on the road first. thinkin about black with some torque thrust.
http://i47.photobucket.com/albums/f1...o/102_0665.jpg
http://i47.photobucket.com/albums/f1...o/102_0637.jpg
man i wish i could help, but im going through the same thing you are. i really dont want to spend $650 on an engine harness so im going to try to make the harness stand alone.
You can dissect the harness fairly easy. You just need to know what plugs/connectors need to stay in the harness to make sure your motor wont throw a code after you re-tune the ECM. Your tuner will need to know all the details, so they can tune accordingly. A wiring diagram will show every pin number and color on the ECM. Just remove one by one untill your done. Re-loom the harnes, plug it all back together and your done. I have done this one time with my last build. I had a 2000 LS1 that I put into a full tube chassis, custom offroad truck. I had the mail order tune done by "Wait 4 Me Performance" in Texas for $75.00 a couple of years ago. Go for it, and good luck!!
..........And I will be going through this again in the next few months. I have a 5.3 from an '08 Suburban going into a '72 Blazer. I will do the whole thing again myself just because I am a cheap ass, and cant spend the $700 for someone alse to do it. You can have the wiring done in a day doing it your self and taking your time. Just search for the "Minumum" connectors needed in the harness. I want to say:
knock sensors
o2 sensors
cam position sensor
throttle position sensor
injectors
coil packs
Intake air sensor
Thaere might be more, but off the top of my head, at 6am, that all I can think of.
what about water temp sensor?
Does the ECU use water temp or air temp for cold weather fuel correction?
I dont remember having that, but I could be wrong. I think the air intake sensor will tell the ECM what it needs to in order for the correct amount of air/fuel mixture. I used all seperate sensors and controls for the water temp, oil pressure, electric fan relays, fuel pump, etc. I wanted the absolute minimum in the wiring harness.
you dont need 02 senors do you?
thought that was just in new rides you had to have em on.
Yes, the o2 sensors tell the ECM how the fuel is burning, rich or lean.
oh i was thinkin you could take off all the emissions stuff completely off. cuz ya o2 go in ya exhaust and ive seen em with wires cut and it runnin fine
It will run fine, it will just throw a code on the ECM. But you want them for optimum performance. If you dyno tune, you will need 'em.
thanks sandking i might need your help when i get started.
No problem!! I have done tons of reading on this stuff before I even started my other build. You will come across a lot of opinions, I was just looking for facts. I will dig through my files for any other usefull info.
thanks for the help. hoppfully this weekend im going to pull the motor from the wrecked tahoe. will i need the fuse box in the engine compartment, im thinking all i need is the motor with all accories, engine harness and the fuse box. can you tell me what i need to get.
i should receive the pcm tommorow , thats when i''l hack the harness up . by the way here's some pics of my old truck 87 chevy 5.3 700r4 ,3.73 posi holley
YouTube - 1-87 Chevy BURNOUT 2
YouTube - 1-87 Chevy at Angelton Raceway
http://i47.photobucket.com/albums/f1..._photo/003.jpg
http://i47.photobucket.com/albums/f1..._photo/296.jpg
thats a nice truck man, hope mine turns out like that
i miss old betsy she's in mexico now got $5000 for her
Quote:
Originally Posted by lechez71
I guess that depends on how "Stock" you want to keep things. Do you need it? No. Can you use the stock one? Of corse. I did not use the stock one, I just used a standard fuse block from a local supplier. I wired everything in the truck from the fuses. I ran my own relays for the lights, fuel pump and fans. I personaly would rather build it instead of trying to make the stock work, again, personal preference.
..........oh yeah, I would grab as much as you can!! even if you think you dont need it, take it anyway. It wont hurt. Make sure you grab all the front acc's, harness, ECM, and probably the MAF sensor with the air intake tube stuff.
One more thing. Depending on the year of the motor, grab the throttle pedal assembly. The "Drive By Wire" throttle bodies work from a sensor on the pedal. It would be easier to adapt the whole pedal to your truck.
Quote:
Originally Posted by 1 bad blazer
Nice!!!! Too bad my POS speakers dont work.
that's one thing i did do , was grab mass air , fuel tank, throttle cable , air box and tubingand all the acc's . this makes the swap much easier, and thanx for the help guys.
but if you have pcm re did cant ya whip out the emissions stuff and it run better?
how you wire your cruise?
Yes, you can remove all of the emissions. But there are certain sensors that are just better off keeping. Trial and error, win some, loose some.
i really dont want to use the stock fuse block from the 03 tahoe, i want my 82 c10 to have a clean engine bay. but ill take your advice since youve done it already, ill get as much as i can. you started from scratch on the wire harness , how willl i get the truck harness and the engine harness to work together on the truck. sorry if your getting bored with the questions.
Naw man, I dont mind the questions........I will have plenty of my own.
The ECM just needs a power wire (orange), remote wire (pink) and a ground wire (black). The rest of the engine harness just relays data and signals to and from the brain. The fuses are for your accesories (lights, radio, wipers, rad fans, fuel pump and so on). I did fuse the power wire to the ECM too. Maybe not needed, but what the heck. So, in short, the fuse block will be totally seperate from the rest of the "Engine" harness. Hope this helps.
im going to a local book store tommorrow to find a book on how to wire an ls based engine, hopefully i find something.
I guess I did not answer you question right.
Do you plan on using the stock gauges? If so, I am not sure how to adapt those to the newer senders. If you use aftermarket gauges, you can use new senders that are compatible with that gauge.
I cant answer your question about merging two different harnesses. But I am pretty sure the new ECM will not support the existing gauges.
Sorry, not much help there.
I will search around too. I will go hrough this in the next few months on my '72. All I need to figure out, is the gauges. Everything else will be stand alone from the ECM and the harness.
yeah you answered my question, but i want to get a book to help because i dont want to bother you to much. oh and yes i plan on using the stock gauges.
does yours use same style as 73-87?Quote:
Originally Posted by sandking
if so you can use the electric gauges out of a 87-91 burban and run the wires from ecm to them or thats what someone on here said before
Use the factory gauges and sending units that came in the truck. You can use adapters to marry them to the Gen3 engine. The PCM cannot power old technology gauges.
what you use to marry em together then cuz imma need some gauges for my 84 when i find motor then
it's alive !!!! . started the motor today just stay on for maybe thirty second becuase we were squirting gas down the tb . i going to do all the wiring over the weekend.
sweet when you get it running post a vid
i well haven't posted pics of the any progress because it was at a stand still, but today i dropped the k5 with a flip kit and springs . i also installed a jet servo, and 4.10 gears . i''l tell you what, the gears made this thing a beast . pulls real hard even with 22'' well enough said here are some pics
http://i47.photobucket.com/albums/f1...o/102_1312.jpg
http://i47.photobucket.com/albums/f1...o/102_1310.jpg