Only 1 plug had carbon build up

[Mango™]

I seach this forum and did not find anybody with the same prob.

The passanger middle plug keeps getting carbon build up. This will make my stops and idle hesitant.

I do burn oil from the tail pipe (no leaks), about 3-4 qts a week or after driving 500 miles. I only see smoke from the tail pipe when I accelerate quickly. Is this my issue? I use STP gas cleaner 2-3 times a month.

Thanks

91 s-10 155k miles, v6 4.3l motor.

[dmbrisket 51]

overdoing the additive for one, and two, do a compression and leak down test, if that turns out ok, then the oil is most likely getting past a lifter.. and your pro says 91 s 10, but what moter? that will help to deturmen the problem

[Mango™]

I put it in the origianl post, but here it is.
91 s-10 155k miles, v6 4.3l motor.

[OverBoardProject]

Low compression in that cylinder.

I've had a simular prob with another truck once.

going through that much oil without a visible leak usually means it's time for a rebuild.

for you to loose that much oil from a leak it has to almost pour out while running. I've really only seen this happen past broken sending units

[xtrememeasures10]

Time for New rings. My truck is doing the same thing. Ready for a rebuild.

[BlazerLT]

you burn 3-4 qts a week?

[dmbrisket 51]

ill beleve it, when i first got my honda it was going through 2 a week

[BlazerLT]

i WOULD REPLACE THE pcv VALVE.

[Mango™]

have put a new pcv in, what will that fix though

[BlazerLT]

oil consumption.

[OverBoardProject]

No promises but if you can take your truck off the road for 1 or 2 days right before the next oil change, pour in some ATF fluid, or coal oil into that 1 cylinder through the spark plug hole it might loosen up the rings.

If your motor wasn't sitting for a while this trick probably won't work, it just helps loosen up mildly gummed up or rusty rings usually caused by sitting

Some of this oil will probably drain past the rings which is why I said before the oil change.

[Mango™]

Thanks Over I think I will try that, is that oil sold at any autopasrt store?
Thanks

[BlazerLT]

No, do not put ATF and run your engine offroad.

What you need is a safer alternative that doesn't thin the oil out.

Try this stuff www.Auto-rx.com

I am currently using it and you won't believe how much it has helped my engine.

[OverBoardProject]

That's why I said pour it in the spark plug hole, and just let it sit 1 or 2 days before your oil change.

It'll hopefully remove the gum from the rings, and loosen them up

Your right though LT, adding ATF to your oil will thin it out way to much