Official NBS V6 to GENIII V8 swap Guide
11-24-2018, 12:55 AM
#264
100% Redneck
11-28-2018, 03:37 PM
#266
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04 5.3 in an 05 4.3 Silverado. No spark???
great thread, wish it was the first one that came up when i did my search! anyway couple questions...
ecu - if you got a motor, harness, and ecu from a v8 truck can you use the v8 ecu. im not looking to get any more right now than just a stock v8 (yup manifolds and all) so i dont need a custom tune or anything.
acc bracket - bolts up to the v8? ps pump and alt can stay same locations? dont have to touch wiring or ps hoses or anything? thats what i had assumed but wanted to double check.
flexplate - you just need to make sure the flexplate is the "bell" shaped one that sticks out (like an ls1)?
manifolds - if i do use the stock manifolds to get going, will they match up to the stock y pipe?
year motor - our truck is a 4.3 rwd ext cab 2001 so im looking for a 99-02 engine? i know about the dbw part, but does the harness ecm etc change after 02? or if i get an 03 later motor harness ecu could i just change to an older ls1/ls2 intake with a cable throttle body?
thanks for any help you can give! ! This truck is a daily driver, unlike the syclone which is getting a build 6.0 and im using fast xfi, turbo, etc. I want her truck to be just like it is now, she gets in, turns the key, and goes to work and back just like its the stock 4.3 (just sounds better and has more umphfffffff!)
ecu - if you got a motor, harness, and ecu from a v8 truck can you use the v8 ecu. im not looking to get any more right now than just a stock v8 (yup manifolds and all) so i dont need a custom tune or anything.
acc bracket - bolts up to the v8? ps pump and alt can stay same locations? dont have to touch wiring or ps hoses or anything? thats what i had assumed but wanted to double check.
flexplate - you just need to make sure the flexplate is the "bell" shaped one that sticks out (like an ls1)?
manifolds - if i do use the stock manifolds to get going, will they match up to the stock y pipe?
year motor - our truck is a 4.3 rwd ext cab 2001 so im looking for a 99-02 engine? i know about the dbw part, but does the harness ecm etc change after 02? or if i get an 03 later motor harness ecu could i just change to an older ls1/ls2 intake with a cable throttle body?
thanks for any help you can give! ! This truck is a daily driver, unlike the syclone which is getting a build 6.0 and im using fast xfi, turbo, etc. I want her truck to be just like it is now, she gets in, turns the key, and goes to work and back just like its the stock 4.3 (just sounds better and has more umphfffffff!)
So I have read this thing through several times and I too, like the post above, am just looking for a daily driver.
I purchased a used 5.3 with its matching transmission, wiring harness, computer, y-pipe and everything out of a wrecked 04 Avalanche. I witnessed the truck run prior to the engine and trans being removed. I have already put it in my truck, did a VATS relearn and I am still not getting any spark...? I am getting fuel and everything else seems to be fine. Do I need to have the ECU flashed or something? I have checked all the grounds, by feel only, need to get another multimeter, and they are tight. I even added secondary ground to each harness for the coil packs and nothing! Is there something I'm missing? I did not change anything, just dropped everything from the other truck into mine and hooked everything up. PLEASE HELP, this is my only vehicle and it has been down for 6 days and it's in the low 30's here!
Thanks in advance!
11-28-2018, 08:05 PM
#267
i had that problem the first time i tried to start mine - everything metered out fine but no spark signal to the coils. verified it to be a PCM problem by putting the computer in my recruiter's truck & it not starting either. mailed it back to the tuner, and he claimed all he did was flash it again, but it fired right up when i got it back.
not saying that's definitely your case, but it could be an option to try.
not saying that's definitely your case, but it could be an option to try.
11-28-2018, 08:21 PM
#268
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i had that problem the first time i tried to start mine - everything metered out fine but no spark signal to the coils. verified it to be a PCM problem by putting the computer in my recruiter's truck & it not starting either. mailed it back to the tuner, and he claimed all he did was flash it again, but it fired right up when i got it back.
not saying that's definitely your case, but it could be an option to try.
not saying that's definitely your case, but it could be an option to try.
11-30-2018, 11:40 AM
#269
Are you absolutely / positively and then Absolutely sure "AGAIN" that the PCM is the same as the motors??? I bought a Motor (Harness and Computer) and it had what I was told was the original PCM to the motor and I ended up having a start-up issues until the PCM got flashed by a local tuner.
Good luck.
Good luck.
11-30-2018, 11:54 AM
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Are you absolutely / positively and then Absolutely sure "AGAIN" that the PCM is the same as the motors??? I bought a Motor (Harness and Computer) and it had what I was told was the original PCM to the motor and I ended up having a start-up issues until the PCM got flashed by a local tuner.
Good luck.
Good luck.