c1500 5.3 swap
On The Tree
Joined: Jul 2020
Posts: 120
Likes: 16
agree with post above. but... I recently completed a LS swap of a '13 5.3 into a '86 C10 truck. I utilized the factory ECM, pedal, harness and transmission. the first thing I did was go to "lt1swap" and get the pinout diagram(s) for my year engine. then found the wiring diagrams for both the engine & the vehicle used. I do know that you will need to find at least a "constant on" & key-on" power sources. hope this helps.
good luck
good luck
TECH Fanatic
Joined: Sep 2008
Posts: 1,645
Likes: 526
The basics are.
First double check 12 volts in start and run.
Turn the key to run and you should hear the fuel pump runs for a few seconds and then turn off because the ECM isn't seeing the crank shaft rotate.
If the fuel pump fires up that's good. If it doesn't you need to figure that out. Borrow a fuel pressure gauge (Oreillys) and check fuel pressure at the fuel rail while cranking. Should be 58 PS1.
You must have good grounds. To the engine block. To the frame. Can't have too many good grounds.
First double check 12 volts in start and run.
Turn the key to run and you should hear the fuel pump runs for a few seconds and then turn off because the ECM isn't seeing the crank shaft rotate.
If the fuel pump fires up that's good. If it doesn't you need to figure that out. Borrow a fuel pressure gauge (Oreillys) and check fuel pressure at the fuel rail while cranking. Should be 58 PS1.
You must have good grounds. To the engine block. To the frame. Can't have too many good grounds.
Thread Starter
Teching In
Joined: Nov 2023
Posts: 6
Likes: 1
ok so i have a silverado 1991 swap to 5.3 vortec DBW im using a aftermarket wiring harness and its not the original ECM but its program and all that got 12v on the fuses and i don't have any left plugs change the crank and cam sensors already but i dont have spark and fuel injection
Thread Starter
Teching In
Joined: Nov 2023
Posts: 6
Likes: 1
agree with post above. but... I recently completed a LS swap of a '13 5.3 into a '86 C10 truck. I utilized the factory ECM, pedal, harness and transmission. the first thing I did was go to "lt1swap" and get the pinout diagram(s) for my year engine. then found the wiring diagrams for both the engine & the vehicle used. I do know that you will need to find at least a "constant on" & key-on" power sources. hope this helps.
good luck
good luck
Thread Starter
Teching In
Joined: Nov 2023
Posts: 6
Likes: 1
The basics are.
First double check 12 volts in start and run.
Turn the key to run and you should hear the fuel pump runs for a few seconds and then turn off because the ECM isn't seeing the crank shaft rotate.
If the fuel pump fires up that's good. If it doesn't you need to figure that out. Borrow a fuel pressure gauge (Oreillys) and check fuel pressure at the fuel rail while cranking. Should be 58 PS1.
You must have good grounds. To the engine block. To the frame. Can't have too many good grounds.
First double check 12 volts in start and run.
Turn the key to run and you should hear the fuel pump runs for a few seconds and then turn off because the ECM isn't seeing the crank shaft rotate.
If the fuel pump fires up that's good. If it doesn't you need to figure that out. Borrow a fuel pressure gauge (Oreillys) and check fuel pressure at the fuel rail while cranking. Should be 58 PS1.
You must have good grounds. To the engine block. To the frame. Can't have too many good grounds.
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TECH Apprentice
Joined: Aug 2018
Posts: 383
Likes: 108
You popped the fuel rails to confirm you are not getting injector spraying? Have you checked the injector wiring to see if you are getting electrical pulsing?
As far as missing spark, that may be related to a crankshaft position sensor (note: if the ECU doesn't have CPS signal it's not going to fire injectors.)
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Verdad Gallardo Thread Starter
Teching In
Joined: Nov 2023
Posts: 6
Likes: 1
Those may or may not be related.
You popped the fuel rails to confirm you are not getting injector spraying? Have you checked the injector wiring to see if you are getting electrical pulsing?
As far as missing spark, that may be related to a crankshaft position sensor (note: if the ECU doesn't have CPS signal it's not going to fire injectors.)
You popped the fuel rails to confirm you are not getting injector spraying? Have you checked the injector wiring to see if you are getting electrical pulsing?
As far as missing spark, that may be related to a crankshaft position sensor (note: if the ECU doesn't have CPS signal it's not going to fire injectors.)
