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#1 |
Still drivin' a Rat Rod
Join Date: Sep 2004
Location: Monett Missouri
Posts: 4,925
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Where's the smoke?
My truck has been fouling plugs for a while now.It's usually #1,and sometimes #7.Both on the drivers side.
The engine does not smoke.Maybe a little in the morning after sitting all night,but never after firing it up in the morning.I have switched gas stations 4-5 times,that didn't help.I can't see any reason it would foul a plug.Any ideas welcome at this point. It's a 1969 350,flat top pistons,original spec replacement cam,HEI,AC R45 plugs.Q-Jet carb.That's about it.
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Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the *a$#* 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website |
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#2 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: Where's the smoke?
Quote:
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#3 |
'67 K10 Work In Process
Join Date: Feb 2004
Location: Delano MN
Posts: 163
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Re: Where's the smoke?
I would suggest checking the plug wires also--if the plugs are running a bit on the cool side because of a lack of power from the coil they could build up deposits that will not burn off
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#4 |
Senior Member
Join Date: Jan 2001
Location: Virginia Beach, Va, USA
Posts: 1,677
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Re: Where's the smoke?
they can also do a copression foul or the wires could be the problem do comp ck.
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1969 Chevelle 1990 IROC Z Convertible 2002 Silverado LT |
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#5 |
Senior Member
![]() Join Date: Jul 2004
Location: Estherville, Iowa
Posts: 3,371
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Re: Where's the smoke?
Is it gas fouling(just black) or oil fouling(chunky brown/black) ??? Short drives in cold weather can contribute to fouling. Might try a little hotter plug and get the ones with the extended tips.
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1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0 |
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#6 |
Still drivin' a Rat Rod
Join Date: Sep 2004
Location: Monett Missouri
Posts: 4,925
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Re: Where's the smoke?
The truck has been together almost 2 years.It doesn't use much oil,leaks around the valve covers,I figure that's where most of it goes.
I am going to do a compression check today,and a voltage check to make sure I have a good 12v source.Maybe some new wires and plugs are in order as well. I have seen engines smoke 10x worse than this one and not foul a plug,that's why I don't think it's rings or guides.Could be wrong though,it happens on occasion ![]() Thanks
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Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the *a$#* 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website |
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#7 |
Still drivin' a Rat Rod
Join Date: Sep 2004
Location: Monett Missouri
Posts: 4,925
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Re: Where's the smoke?
Compression is good,and 12v to the HEI.I replaced the wires,and plugs,we'll see how it goes this week.I did gain a little on the performance end,so maybe that was the problem
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Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the *a$#* 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website |
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#8 |
Registered User
Join Date: Mar 2001
Location: Paradise TX USA
Posts: 1,200
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Re: Where's the smoke?
Check that your intake manifold bolts are torqued properly. If they're a little loose, it can suck oil out of the lifter valley past the intake gaskets. I've seen this happen a few times, especially when using aluminum intake manifolds.
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"Negative people always seem to have a problem for every solution" |
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#9 |
Still drivin' a Rat Rod
Join Date: Sep 2004
Location: Monett Missouri
Posts: 4,925
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Re: Where's the smoke?
Well it made it a week before it fouled a plug.#1 again.
Plug was black fouled. I did notice a little oil pooling on the intake,didn't check the torque on the bolts though.I'm using a stock intake and a Q-jet.I don't notice any loading or running really rich or anything,just fouls a plug every now and again. Carb is off a buddys 76 4x4 with a 350,never had an issue on his truck,just swapped for a Holley.This has been an issue even with the 2 BBL on it.I swapped the 4BBL on a few months back. MAybe I should just build a new motor,and forget it ![]()
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Rusty Member #13872 Instead of saying.....you are a discomfort in the back of my front.....one should be able to say...... you are a pain in the *a$#* 71 GMC LWB 49 Chevy 85 Chevy G20 Check out my website Last edited by Brainchild; 01-14-2006 at 08:41 PM. |
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#10 |
Old Skool Club
![]() Join Date: Jun 2001
Location: Benton, AR "The Heart of Arkansas"
Posts: 10,880
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Re: Where's the smoke?
My '69 has the original 350 block in it, with later heads. It had another intake, from the engine that the heads came from. With an Edelbrock 1405, it ran rich and would foul #1, before any others ever did. So, I kept a set in the truck, with the tools needed to swap one out.
Later, I changed the intake to an Edelbrock and the carb to an Edelbrock 1901. Still, the #1 would foul, but not as much. I tried different plugs, including AC Rapidfires in the R45TS type. Better, but not cured. One day, after several months of a mysterious bout of sudden engine dying fits, it died and I had it hauled home. The HEI that was on it when I bought it, was about to be changed for an ACCEL unit, that was essentially a rebuild to their specs. Since that time, my engine has not fouled another plug. My engine does get rid of some oil, as blowby. It comes out of the oil fill cap, and there isn't anything I can do, except rebuild it or replace it. The exhaust pipes are black, and sooty. The engine isn't running rich, anymore. So, I'm quite satisfied that the ACCEL HEI that I installed is the reason my engine isn't fouling the plugs, any more.
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Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was. |
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#11 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: Where's the smoke?
i always thought hei was suppose to have a good 14 volts to it? not 12
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#12 |
Account Suspended
Join Date: Jan 2006
Location: Visalia, California
Posts: 286
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Re: Where's the smoke?
cheap plugs??? dont feel too bad, i found out my bad mpg was due to me dragging 3 dead. hehe...woops! starts first crank now too, also that $100 battery ought to do the trick.
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#13 |
Just hang'n around
Join Date: Nov 2005
Location: Camano Island WA
Posts: 248
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Re: Where's the smoke?
I was also thinking the original intake might be worn and I was also thinking the HEI had some issues. Make sure you're gapping your plugs for the HEI ignition. If the gaps are too tight you could be burning the plugs up.
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Driving a '68 Chevy C20 and a '93 Astro Van. Lots and lots of mileage that I deduct each year. |
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#14 |
Account Suspended
Join Date: Dec 2005
Location: martin georgia
Posts: 568
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Re: Where's the smoke?
try getting a hotter plug. or if you stay on its a$$, you could flood it, and it foul the plugs
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