fuel fouling plugs in 305 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

78customdeluxe · 01-20-2003, 06:24 PM

i have an 86 pickup with a 305 4-barrel carb that has the electronic carb on it. i have a problem with the plugs fuel fouling when the engine is cold. when the engine is warm it fires right off(better than my moms brand new van). it is not carbon on the plugs and it has great accelleration after it starts. i can lean the carb all the way down so it barley runs and it still will foul the plugs. when it fouls them i will take them out and spray them with ether and light them to burn off residue then sandblast them. put them in and it fires right off. i dont know if it has something to do with the plugs or the ignition module not igniteing it at the right time. when i first try to start you can hear mabey 1 to 3 cylinders fireing but then after about 5 to 10 seconds they quit. sorry it is kinda long but i just want to get it fixed so i can drive it without worry.

PHOENIX · 01-20-2003, 06:34 PM

When was the last time you put new plugs in it?

78customdeluxe · 01-20-2003, 06:38 PM

plugs are less than 6 months old. although i did have a problem with the whole engine flooding a few months back though due to a sticking float and it hadnt been run really at all untill a few weeks ago because i just got my licence.

**swervin ervin** · 01-20-2003, 08:38 PM

Buy a new set of plugs and get the correct ones for your engine. I think they are too cold, as in the wrong plugs.

Also, never, ever, sandblast plugs. This kills them. Sure they will run good for a few miles, then they foul again.

Also, it may be time for some carb work. Add a new set of wires while you are at it. One more thing, you don't have an electronic carb. Only a dual capacity pump system, as all LE9 305's came with. That is, if your engine and carb is stock.

gchemist · 01-20-2003, 11:14 PM

What gap size are you using?

78customdeluxe · 01-22-2003, 06:14 PM

ok i just got a new set of plugs today and havent put them in yet. my old plugs i was gapping them at what i was told by one of my sources(which i wont rely on now) .0035. so i did some checking and am now going to gap them at .0045. thanks for your help.

01-20-2003, 06:24 PM	#1
78customdeluxe Registered User Join Date: Dec 2002 Location: Upper Sandusky Ohio Posts: 72	fuel fouling plugs in 305 i have an 86 pickup with a 305 4-barrel carb that has the electronic carb on it. i have a problem with the plugs fuel fouling when the engine is cold. when the engine is warm it fires right off(better than my moms brand new van). it is not carbon on the plugs and it has great accelleration after it starts. i can lean the carb all the way down so it barley runs and it still will foul the plugs. when it fouls them i will take them out and spray them with ether and light them to burn off residue then sandblast them. put them in and it fires right off. i dont know if it has something to do with the plugs or the ignition module not igniteing it at the right time. when i first try to start you can hear mabey 1 to 3 cylinders fireing but then after about 5 to 10 seconds they quit. sorry it is kinda long but i just want to get it fixed so i can drive it without worry. __________________ 88 Crewcab Dually 5.9 Cummins, 5306 Eaton 6-speed, converted 4x4 w/52's up front, 90 front clip(parting out) 1986 ElCamino (needs motor) 1970 C30(future service truck for my ag-equipment repair business) 1970 CST10(parting out and partial donor for the '70 C30) 2000 GMC 1500 ext cab sb, z71, 5.3 loaded auto

01-20-2003, 06:34 PM	#2
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	When was the last time you put new plugs in it? __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

01-20-2003, 06:38 PM	#3
78customdeluxe Registered User Join Date: Dec 2002 Location: Upper Sandusky Ohio Posts: 72	plugs are less than 6 months old. although i did have a problem with the whole engine flooding a few months back though due to a sticking float and it hadnt been run really at all untill a few weeks ago because i just got my licence. __________________ 88 Crewcab Dually 5.9 Cummins, 5306 Eaton 6-speed, converted 4x4 w/52's up front, 90 front clip(parting out) 1986 ElCamino (needs motor) 1970 C30(future service truck for my ag-equipment repair business) 1970 CST10(parting out and partial donor for the '70 C30) 2000 GMC 1500 ext cab sb, z71, 5.3 loaded auto

01-20-2003, 08:38 PM	#4
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Buy a new set of plugs and get the correct ones for your engine. I think they are too cold, as in the wrong plugs. Also, never, ever, sandblast plugs. This kills them. Sure they will run good for a few miles, then they foul again. Also, it may be time for some carb work. Add a new set of wires while you are at it. One more thing, you don't have an electronic carb. Only a dual capacity pump system, as all LE9 305's came with. That is, if your engine and carb is stock. __________________ Mike 1985 Chevy C-10

01-20-2003, 11:14 PM	#5
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	What gap size are you using? __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

01-22-2003, 06:14 PM	#6
78customdeluxe Registered User Join Date: Dec 2002 Location: Upper Sandusky Ohio Posts: 72	ok i just got a new set of plugs today and havent put them in yet. my old plugs i was gapping them at what i was told by one of my sources(which i wont rely on now) .0035. so i did some checking and am now going to gap them at .0045. thanks for your help. __________________ 88 Crewcab Dually 5.9 Cummins, 5306 Eaton 6-speed, converted 4x4 w/52's up front, 90 front clip(parting out) 1986 ElCamino (needs motor) 1970 C30(future service truck for my ag-equipment repair business) 1970 CST10(parting out and partial donor for the '70 C30) 2000 GMC 1500 ext cab sb, z71, 5.3 loaded auto



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