Official NBS 4.3v6 to GEN 3 V8 swap Guide

[zebra]

Dennis, that's one clean motor!
good job on the swap


so does anybody have any clue about my battery light issue?

[DennisG_02Silverado]

Dennis, that's one clean motor!
good job on the swap


so does anybody have any clue about my battery light issue?

thanks

have you checked the alternator, making sure it puts out what it should.... also check all battery connections

[zebra]

like i said earlier, connections are good, alternator's good, new battery

however, i found out the battery light problem the other day...

after talking with Jared @ Current Performance, he mentioned that he's seen a bunch of 99 model trucks getting newer motors and doing this - it's throwing code P1638 (if i remember right) which is a Generator Terminal Code. it comes from something about how the newer motors not liking the way the truck 'talks' to the alternator or something. that code just has to be tuned out

[Fadingglories]

Yeah i am using a 2000 wiring harness on a 2006 motor and components and luckily i have a very good friend who will do a custom dyno tune for me and bleep out the EGR valve that the harness is set up for. My status right now is that i have My v6 out and my v8 ready to be put in but my v8 frame mounts are wrong so i am praying that the dealership has them in stock tomorrow morning. I probably could have had the thing running by midnight if i had not hit this problem which is pretty good considering that i started this morning thanks to the original post and the detail that went into it.

[DennisG_02Silverado]

i went to the junkyard and got my motor frame mounts. just looked for a 2wd v8 truck

[Fadingglories]

Well I got my 5.3 in and everything connected and went to fire it up and it wants to run but wont. It says absolutley no oil pressure and it fires up for a split second and then dies. I know this information is very vague but its all i have right now. Any ideas?

[zebra]

if it starts then dies immediately, you probably have a VATS issue. try a security relearn & i think you'll be fine. as for oil pressure, the oil pump ain't got time to build pressure if it dies right off

[Frenchy]

+1

[Fadingglories]

Ok so my friend completely removed my vats from my computer (i still have a aftermarket alarm with starter kill) and it started right up and sounded mean but i had to shut it right off again because there is NO oil pressure and the valves are clacky as hell. I am going to pull the motor and check the oil pickup tube o-ring. I am pretty sure the stupid kid i bought the motor from messed it up when he had it taken apart. If this doesn't solve my problem i am going to save a couple of weeks and put in a 6.0 because i really don't feel like messing around with a stupid oil pump because i have read it is not so simple.

[texasRSTsilverado]

Ok so my friend completely removed my vats from my computer (i still have a aftermarket alarm with starter kill) and it started right up and sounded mean but i had to shut it right off again because there is NO oil pressure and the valves are clacky as hell. I am going to pull the motor and check the oil pickup tube o-ring. I am pretty sure the stupid kid i bought the motor from messed it up when he had it taken apart. If this doesn't solve my problem i am going to save a couple of weeks and put in a 6.0 because i really don't feel like messing around with a stupid oil pump because i have read it is not so simple.

if youre going to pull the motor again you might as well just put in a brand new and bigger aftermarket oil pump to be safe. Its not that difficult if the motor is already out of the vehicle and it should only run you about 200 bucks depending where you shop around at. The oil pickup tubes are notorious for causing low oil pressure in these motors though. You will need to make sure that the tube and o-ring are seated correctly in the hole and that the tube is not the cause of your problem first.