Smashed Spark Plugs (351W)
Thread Starter
|
New User
Joined: Oct 2009
Posts: 9
Likes: 0
Smashed Spark Plugs (351W)
My truck started smoking recently kinda out of no where. It is a blue/grey smoke like oil, not the pure white from a blown head gasket. It doesn't start with a big puff of smoke as I'd expect with a worn engine, but rather it starts clean and then as it warms up it starts smoking. I don't notice it running down the road (though it might be) but it is especially bad at idle.
I took out my spark plugs looking for some insight and found that two of my spark plugs were damaged. Number 8 had no gap and was very black and wet while #3 was completely destroyed and also black and wet.
Compression in #8 seems ok though I didn't have a gauge it will blow my finger off when I cover the hole. Number 3 on the other hand has low compression. I can feel it moving air so I don't think it threw a rod but I've been wrong before. Here are some links to pictures of the plugs.
Picasa Web Albums - David - Truck Stuff
You can't see it real well but it looks like something is repeatedly hitting them like there might be something in the cylinder. The third plug is a representation of what the rest of them look like (normal).
Anyone have any idea what is wrong and what caused it?
I took out my spark plugs looking for some insight and found that two of my spark plugs were damaged. Number 8 had no gap and was very black and wet while #3 was completely destroyed and also black and wet.
Compression in #8 seems ok though I didn't have a gauge it will blow my finger off when I cover the hole. Number 3 on the other hand has low compression. I can feel it moving air so I don't think it threw a rod but I've been wrong before. Here are some links to pictures of the plugs.
Picasa Web Albums - David - Truck Stuff
You can't see it real well but it looks like something is repeatedly hitting them like there might be something in the cylinder. The third plug is a representation of what the rest of them look like (normal).
Anyone have any idea what is wrong and what caused it?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Not good, you may have cracked a piece off a valve and it's bounced around in there for a while before getting blown out the exhaust. The valve would have cracked from a persistent lean condition on that cylinder.. possible dirty fuel injector. In any event looks like you're pulling a head or two to figure out why compression is low and what's causing the damage.
Thread
Thread Starter
Forum
Replies
Last Post
Acidic
1987 - 1996 F150 & Larger F-Series Trucks
22
Feb 21, 2014 12:10 AM
retro48/52
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
13
Jul 30, 2011 07:56 AM
