Soaked plug one cylinder - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davecarney2 · 10-08-2019, 10:02 AM

6 year project 2003 6.0 from an SS Silverado with a 4L80e. Went to check for oil pressure etc prior to starting the first time and it locked with fluid. #6 cylinder plug soaked removed all plugs and the #6 blew gasoline everywhere out of the spark plug hole. Gasoline in the oil now to from filling the cylinder. I did run it for 20 seconds and it sounded fine but next day turned the key on and it filled the #6 again. Afraid to start engine again. Any advice on troubleshooting this would be greatly appreciated. So close to seeing the road with this thing.

ls1nova71 · 10-08-2019, 10:19 AM

You have an injector stuck open, just replace it. Not worth trying to unstick it because you never know when it will do it again and you don't want to damage something trying to start a hydrolocked engine. When I had this happen, I tried to start it and it knocked a tooth off the flexplate, luckily it didn't bend a rod.

sprint_9 · 10-08-2019, 10:26 AM

I'd send all your injectors off to be cleaned if it's been sitting for a long time. You have one that is most likely stuck open but you might have others that aren't opening as far and running lean.

I had two on mine that were stuck shut. I sent the set off to be cleaned and had 3 more that were leaned out. After cleaning there were all back to operating evenly with the correct flow.

davecarney2 · 10-08-2019, 12:29 PM

Thanks all. I’ll have them cleaned and flowed and see where I’m at

kipps · 10-08-2019, 06:37 PM

What's involved in cleaning and flow testing injectors? Who does it? Where do I send them? Is it cheaper than new injectors from rockauto?

87chevy.com · 10-08-2019, 09:38 PM

change your oil. seen 2 engine seize connecting rod bearings to crank because of of oil saturated with fuel because of an stuck open injector. oil cheap, engine not so cheap.. or listen to cuzen ed that said he had no problem. your sounds pretty bad as you can aslso have a bent rod if you tired using the starter to crank it. compression check it and see what the max deviation between other cylinders and the one filled with fuel is. if its quite a bit.. no bueno.

davecarney2 · 10-12-2019, 10:59 PM

Got me cleaned and flow checked cost me $22 each. Changed oil. Thanks for the advice. I still have no oil pressure but that's another problem I'm trying to figure out

bigmoe · 01-11-2020, 10:58 AM

I'm getting closer to starting my engine that has sat for a few years. I pulled the fuel rails off and the gas in them was pretty bad. I considered cleaning my injectors myself after researching on you tube but I decided to replace my injectors with new.

prodjay10 · 01-11-2020, 02:28 PM

used oem injectors on eBay are about $50. You can hook them up to the rail and see if they leak before installing. Or you can Jaír test the ones you have to see which is not working.
Posted via Mobile Device

LS short box · 01-11-2020, 06:10 PM

Check LS1 tech forum. There is a company in north GA called Fuel injection connection. I believe they can clean and flow yours or sell you "new" rebuilt injectors.
I'd be careful about the ebay rebuilt. A couple of tuners that I've used said the same thing. You have to buy rebuilt injectors from a well regarded rebuilder because if the rebuilder doesn't know what they are doing the injectors can end up with different flow rates the make tuning a real pain.

10-08-2019, 10:02 AM	#1
davecarney2 Registered User Join Date: Jun 2012 Location: Catawba NC Posts: 230	Soaked plug one cylinder 6 year project 2003 6.0 from an SS Silverado with a 4L80e. Went to check for oil pressure etc prior to starting the first time and it locked with fluid. #6 cylinder plug soaked removed all plugs and the #6 blew gasoline everywhere out of the spark plug hole. Gasoline in the oil now to from filling the cylinder. I did run it for 20 seconds and it sounded fine but next day turned the key on and it filled the #6 again. Afraid to start engine again. Any advice on troubleshooting this would be greatly appreciated. So close to seeing the road with this thing. __________________ Bagged 1959 GMC 1969 C-30 dump My 59 build. http://67-72chevytrucks.com/vboard/s...d.php?t=592878

10-08-2019, 10:19 AM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Soaked plug one cylinder You have an injector stuck open, just replace it. Not worth trying to unstick it because you never know when it will do it again and you don't want to damage something trying to start a hydrolocked engine. When I had this happen, I tried to start it and it knocked a tooth off the flexplate, luckily it didn't bend a rod. __________________ 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

10-08-2019, 10:26 AM	#3
sprint_9 Registered User Join Date: Nov 2012 Location: 9 Posts: 862	Re: Soaked plug one cylinder I'd send all your injectors off to be cleaned if it's been sitting for a long time. You have one that is most likely stuck open but you might have others that aren't opening as far and running lean. I had two on mine that were stuck shut. I sent the set off to be cleaned and had 3 more that were leaned out. After cleaning there were all back to operating evenly with the correct flow.

10-08-2019, 12:29 PM	#4
davecarney2 Registered User Join Date: Jun 2012 Location: Catawba NC Posts: 230	Re: Soaked plug one cylinder Thanks all. I’ll have them cleaned and flowed and see where I’m at __________________ Bagged 1959 GMC 1969 C-30 dump My 59 build. http://67-72chevytrucks.com/vboard/s...d.php?t=592878

10-08-2019, 06:37 PM	#5
kipps Registered User Join Date: Jul 2014 Location: North-central Virginia Posts: 1,104	Re: Soaked plug one cylinder What's involved in cleaning and flow testing injectors? Who does it? Where do I send them? Is it cheaper than new injectors from rockauto? __________________ 1987 C6P V20 truck, 2010 LMG 5.3, AFM delete, 2010 Camaro exhaust manifolds, 1997 nv4500, 1991 np241c, hydroboost, 2005 14bff axle & driveshaft, drop-n-lock gooseneck, 4.10 gears, stock suspension, rims, and tires. Still a work in progress. Any questions or suggestions are welcome!

10-08-2019, 09:38 PM	#6
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,266	Re: Soaked plug one cylinder change your oil. seen 2 engine seize connecting rod bearings to crank because of of oil saturated with fuel because of an stuck open injector. oil cheap, engine not so cheap.. or listen to cuzen ed that said he had no problem. your sounds pretty bad as you can aslso have a bent rod if you tired using the starter to crank it. compression check it and see what the max deviation between other cylinders and the one filled with fuel is. if its quite a bit.. no bueno. __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress

10-12-2019, 10:59 PM	#7
davecarney2 Registered User Join Date: Jun 2012 Location: Catawba NC Posts: 230	Re: Soaked plug one cylinder Got me cleaned and flow checked cost me $22 each. Changed oil. Thanks for the advice. I still have no oil pressure but that's another problem I'm trying to figure out __________________ Bagged 1959 GMC 1969 C-30 dump My 59 build. http://67-72chevytrucks.com/vboard/s...d.php?t=592878

01-11-2020, 10:58 AM	#8
bigmoe Registered User Join Date: Oct 2014 Location: Brandon, Manitoba, Canada Posts: 995	Re: Soaked plug one cylinder I'm getting closer to starting my engine that has sat for a few years. I pulled the fuel rails off and the gas in them was pretty bad. I considered cleaning my injectors myself after researching on you tube but I decided to replace my injectors with new.

01-11-2020, 02:28 PM	#9
prodjay10 Registered User Join Date: Jun 2016 Location: Phoenix AZ Posts: 429	used oem injectors on eBay are about $50. You can hook them up to the rail and see if they leak before installing. Or you can Jaír test the ones you have to see which is not working. Posted via Mobile Device Last edited by prodjay10; 01-11-2020 at 02:36 PM.

01-11-2020, 06:10 PM	#10
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 2,132	Re: Soaked plug one cylinder Check LS1 tech forum. There is a company in north GA called Fuel injection connection. I believe they can clean and flow yours or sell you "new" rebuilt injectors. I'd be careful about the ebay rebuilt. A couple of tuners that I've used said the same thing. You have to buy rebuilt injectors from a well regarded rebuilder because if the rebuilder doesn't know what they are doing the injectors can end up with different flow rates the make tuning a real pain.



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