first start up? on junkyard engine - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71chevystep4x4 · 11-14-2012, 12:32 AM

Im about to start my 5.3 for the first time in god knows how long. I have a mechanic friend that tells me to squirt a few squirts of oil into each cylinder before I fire it off. What are all of you LS swappers doing for first time starts with in your engines that have been sitting for a long time between running? And what kind of antifreeze are you running? The red stuff that they come with now days, or the conventional green stuff?

ls1nova71 · 11-14-2012, 01:47 AM

I usually pull the plugs and the injector fuses and crank it over for about 10 seconds at a time until you get oil pressure. A little oil down the cylinders wouldn't be a bad idea, it will help the rings since the cylinder walls are probably dry. As for antifreeze, flush out any remaining Dexcool with water and refill with green. Dexcool is horrible!
Posted via Mobile Device

eagleuh1 · 11-14-2012, 06:41 AM

I squirted some marvel mystery oil in my plug holes,set overnight, left plugs out and pulled fuses like LS1Nova71 did for injectors and coils. It doesn't take long for oil pressure to come up. I put a temp guage on just to be sure I had good pressure too. Then put everything back in and stand back for majic. Why is Dexcool horrible? I've been using it no problems so far.

BR3W CITY · 11-14-2012, 12:31 PM

I threw a little wd40 in each cylinder when it was sitting on the stand, a few months later, it was in the truck and fired first crank.

Wasted Income · 11-14-2012, 02:22 PM

I'm with these guys. I normally pull the fuel pump fuse, and disconnect the coils at the valvecover junctions and crank it for a bit to get some oil moving, then fire it up.

71chevystep4x4 · 11-14-2012, 10:29 PM

Thanks, I figured priming it would be best, just not used to not having a distributer to do it with. Funny about the Mervell Mistery oil, I've heard that option as well, some guys swear by that stuff!!

Custom 68 · 11-16-2012, 11:59 AM

One thing to think about if it does not start immediatly is your injectors. Mine were stock ones that sat for quite a while they were gummed up and did not squirt fuel. I pulled my fuel rail and with a helper I unhooked the coil wiring and did one injector at a time. I hooked up the one to work with and started cranking over while tapping on the injector till it shot fuel onto my rag. I went to the next and so on. Then it worked great.
Dave

11-14-2012, 12:32 AM	#1
71chevystep4x4 Registered User Join Date: Sep 2012 Location: Milwaukie OR Posts: 135	first start up? on junkyard engine Im about to start my 5.3 for the first time in god knows how long. I have a mechanic friend that tells me to squirt a few squirts of oil into each cylinder before I fire it off. What are all of you LS swappers doing for first time starts with in your engines that have been sitting for a long time between running? And what kind of antifreeze are you running? The red stuff that they come with now days, or the conventional green stuff?

11-14-2012, 01:47 AM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: first start up? on junkyard engine I usually pull the plugs and the injector fuses and crank it over for about 10 seconds at a time until you get oil pressure. A little oil down the cylinders wouldn't be a bad idea, it will help the rings since the cylinder walls are probably dry. As for antifreeze, flush out any remaining Dexcool with water and refill with green. Dexcool is horrible! Posted via Mobile Device __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

11-14-2012, 06:41 AM	#3
eagleuh1 Registered User Join Date: Jul 2009 Location: Russellville, Arkansas Posts: 1,699	Re: first start up? on junkyard engine I squirted some marvel mystery oil in my plug holes,set overnight, left plugs out and pulled fuses like LS1Nova71 did for injectors and coils. It doesn't take long for oil pressure to come up. I put a temp guage on just to be sure I had good pressure too. Then put everything back in and stand back for majic. Why is Dexcool horrible? I've been using it no problems so far.

11-14-2012, 12:31 PM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: first start up? on junkyard engine I threw a little wd40 in each cylinder when it was sitting on the stand, a few months later, it was in the truck and fired first crank. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

11-14-2012, 02:22 PM	#5
Wasted Income Boosted Member Join Date: May 2002 Location: Mackinaw, IL Posts: 2,200	Re: first start up? on junkyard engine I'm with these guys. I normally pull the fuel pump fuse, and disconnect the coils at the valvecover junctions and crank it for a bit to get some oil moving, then fire it up. __________________ 1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq 1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift 1964 Buick Skylark Twin TURBO 383 LS pro-touring project 2014 VW Passat TDI - Daily Driver Turbo diesel 2015 Sierra Denali HD Duramax Turbo diesel 2023 Ford Explorer ST - Twin Turbskis 2023 Ford F150 RCSB - Whipple Supercharged 2017 Polaris RZR Turbo 2014 Nor-Tech Center Console - Twin Supercharged Outboards *TURBO ALL THE THINGS!!*

11-14-2012, 10:29 PM	#6
71chevystep4x4 Registered User Join Date: Sep 2012 Location: Milwaukie OR Posts: 135	Re: first start up? on junkyard engine Thanks, I figured priming it would be best, just not used to not having a distributer to do it with. Funny about the Mervell Mistery oil, I've heard that option as well, some guys swear by that stuff!!

11-16-2012, 11:59 AM	#7
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,939	Re: first start up? on junkyard engine One thing to think about if it does not start immediatly is your injectors. Mine were stock ones that sat for quite a while they were gummed up and did not squirt fuel. I pulled my fuel rail and with a helper I unhooked the coil wiring and did one injector at a time. I hooked up the one to work with and started cranking over while tapping on the injector till it shot fuel onto my rag. I went to the next and so on. Then it worked great. Dave __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.