Need thoughts on a 'problem'

[GWguy]

Rollers?..yes, you can. Flat tappets...never a good idea..

Well, I'm going to assume they didn't use rollers in this motor. I'll research it another time.

It only makes noise for a few seconds, then nothing. If it's a lifter, I can live with that.

Noise got worse when I went from synthetic 10W-30 to standard 5W-30, so I may go back to a heavier oil. Marvel Mystery oil is cheap, I'll get some more of that.

 

[desertrat]

Well, I'm going to assume they didn't use rollers in this motor. I'll research it another time.

It only makes noise for a few seconds, then nothing. If it's a lifter, I can live with that.

Noise got worse when I went from synthetic 10W-30 to standard 5W-30, so I may go back to a heavier oil. Marvel Mystery oil is cheap, I'll get some more of that.

I still have this in mine. Didn't start until 30k miles or so. It went away for a while??Then came back. Lasts about a block.

Cold-start piston knock involving 4.8, 5.3 and 6.0-liter V8's in '99 to '02 GM cars and trucks. General Motors has previously released a Technical Service Bulletin explaining the condition that occurs after approximately 12,000 miles and a normal accumulation of carbon above the top piston ring.

 

[Chris0nllyn]

How so? I was using Seafoam for a while just to help clear the injectors once in a while, but how do you relate that to an exhaust leak?

Slowly add seafoam to your main vacuum line from the brake booster.

Cleans the carbon off of the upper intake and valves.

Your truck will smoke like crazy from burning it all off. If smoke pours out of the exhaust manifold, or Y-pipe, you know you have a leak.



Depending how carbon'd up your motor is, it'll look like this. (Let your neighbors know, )



((Do it when the motor is hot)

 

[GWguy]

I still have this in mine. Didn't start until 30k miles or so. It went away for a while??Then came back. Lasts about a block.

Hmm. Like I said, it does sound kinda like a diesel, and I was thinking it sounded like advanced timing, which both sound like a piston knock. Maybe that's why the Marvel Mystery oil helps... cleans up the carbon a bit.

I might try some more seafoam, but not entirely sure about adding it directly to the intake like that. I'll wait until the tank is almost empty and then add it, so it's much more concentrated than the recommended one can per tankfull.

 

[DEEKAYPEE8569]

You learned that the hard way, didn't ya.

No Ken. I was clarifying for the non-mechanics.

 

[Chris0nllyn]

Hmm. Like I said, it does sound kinda like a diesel, and I was thinking it sounded like advanced timing, which both sound like a piston knock. Maybe that's why the Marvel Mystery oil helps... cleans up the carbon a bit.

I might try some more seafoam, but not entirely sure about adding it directly to the intake like that. I'll wait until the tank is almost empty and then add it, so it's much more concentrated than the recommended one can per tankfull.

Doing it that way is basically the same thing as going to the dealer and getting an "upper intake cleaning".....I think doctors do the same thing though....

I've added Seafoam to the vacuum line a few times, with multiple cars.

 

[GWguy]

Doing it that way is basically the same thing as going to the dealer and getting an "upper intake cleaning".....I think doctors do the same thing though....

I've added Seafoam to the vacuum line a few times, with multiple cars.

I'll consider doing it that way.

I know there are upper intake cleaning sprays where you empty an entire can into the air intake while the motor is running. Problem with that one is when you disconnect the tube to get access to the throttle body area, the MAF isn't sensing and the motor shuts down. With the K&N filter set up, kinda tough to use the spray.

 

[Chris0nllyn]

I'll consider doing it that way.

I know there are upper intake cleaning sprays where you empty an entire can into the air intake while the motor is running. Problem with that one is when you disconnect the tube to get access to the throttle body area, the MAF isn't sensing and the motor shuts down. With the K&N filter set up, kinda tough to use the spray.

Which is the main reason for using the vacuum line.

I'm actually going to build a check valve setup to seafoam all my cars.

Instead of pulling the vac. line totally, I want to build a contraption that goes in-line and you add the seafoam through that contraption. That avoids the surging and hard running that happens when you take the vac. line off.

 

[desertrat]

Slowly add seafoam to your main vacuum line from the brake booster.

Cleans the carbon off of the upper intake and valves.

Your truck will smoke like crazy from burning it all off. If smoke pours out of the exhaust manifold, or Y-pipe, you know you have a leak.



Depending how carbon'd up your motor is, it'll look like this. (Let your neighbors know, )



((Do it when the motor is hot)

So that is carbon coming out? Looks like steam to me or is that a clean engine look?

 

[GWguy]

Which is the main reason for using the vacuum line.

I'm actually going to build a check valve setup to seafoam all my cars.

Instead of pulling the vac. line totally, I want to build a contraption that goes in-line and you add the seafoam through that contraption. That avoids the surging and hard running that happens when you take the vac. line off.

That is exactly what I was thinking. A small valve with a small hose into a clear jar that you put the seafoam in. That way you can regulate the flow and see how fast you're adding the stuff.

 

[withrespect]

GMC Sierra 1500 4.8L extend cab.

Started getting a 'tick', pretty loud, maybe 8 months ago, when I start it up after sitting for a day or two. Sounds like a lifter, but when you accel a bit, it sounds more like a small diesel, or very advanced timing. A low growl. Goes away after 15 seconds or so.

Seems to be better if I run Marvel Mystery Oil in the fuel.

It got a little worse, thought maybe it was from using a synthetic oil all these years. Switched back to standard 5W-30, which is what is called for in the book. It got worse. Now it happens every cold startup, lasts for 15-20 seconds under load. Once the tick disappears, everything is absolutely normal, no noise, no degraded performance, no OBD warnings.

So engine experts, does it sound like a simple lifter issue? Adjustment/replacement? Or could this be a bigger issue, like a rod/bearing? And how would I figure that out without dropping the pan?

Noise only lasts a few seconds, but if I have a rod/bearing issue, I'd hate to be stranded somewhere when it lets go. I've done that once already.... New Jersey Turnpike, Exit 9, middle of winter at 5 am. Not fun.

Maybe something needs to be fixed on the car.

 

[GWguy]

Maybe something needs to be fixed on the car.

Thanx, sweetie.

 

[Chris0nllyn]

So that is carbon coming out? Looks like steam to me or is that a clean engine look?

Yea, burnt carbon.

The seafoam is cleaning the carbon off of the top of the piston, intake valves, and upper intake. Do it while it's hot, and it works better. Let it sit while, start her back up and watch the smoke show.

That is exactly what I was thinking. A small valve with a small hose into a clear jar that you put the seafoam in. That way you can regulate the flow and see how fast you're adding the stuff.

 

[gary_webb]

Maybe something needs to be fixed on the car.

Couldn't have said it better myself.

(Psst, WR, technically a GMC Sierra is a truck. It'll be our little secret.)

 

[withrespect]

Couldn't have said it better myself.

(Psst, WR, technically a GMC Sierra is a truck. It'll be our little secret.)

damn.

 

[desertrat]

Couldn't have said it better myself.

(Psst, WR, technically a GMC Sierra is a truck. It'll be our little secret.)

And when you pull up to a gas station you aren't a bit afraid! Unless you are near empty and so is your bank account.

 

[GWguy]

And when you pull up to a gas station you aren't a bit afraid! Unless you are near empty and so is your bank account.

Yeah dat....

 

[GWguy]

Stopped at Advance Auto over lunch. Seafoam was on sale, $7.99 vs $10.99. Got a few cans, some Mystery oil and a small gas shutoff valve from the lawnmower section. That should work just fine to use the vacuum line.

Best thing is: it was 'free'. I had gotten a work related bonus in the form of an Advance Auto gift card. Sweet!

 

[withrespect]

Stopped at Advance Auto over lunch. Seafoam was on sale, $7.99 vs $10.99. Got a few cans, some Mystery oil and a small gas shutoff valve from the lawnmower section. That should work just fine to use the vacuum line.

Best thing is: it was 'free'. I had gotten a work related bonus in the form of an Advance Auto gift card. Sweet!

So what was wrong with the car? I have never heard of seafoam or mystery oil for cars either... but then again... I know jack schitt about cars so...

 

[GWguy]

So what was wrong with the car? I have never heard of seafoam or mystery oil for cars either... but then again... I know jack schitt about cars so...

Makes a noise in the motor. See post #1. Whatever it is, is still making noise, but I'll try a few things to make it better.

Seafoam is a liquid you add to the gas to clean the fuel injectors and valves.

Marvel Mystery Oil is an old product, been around for eons, and can be added to the oil, tranny, gas, just about anything, and it helps clean and make things work better. Kinda smells like mint.