Anybody?

Is this addressed in another thread?

Thanks

 

My 95 developed a strange popping (or almost sucking sounding) that only happined at start up, and quickly went away after starting.

One day I was out at my buddy's shop (before I worked there) and since he was the local 6.5 know-it-all, I brought it up to him.

"Put 1 quart of trans fluid in your oil"

Why? When you add trans (with dextron) fluid to the engine oil, it helps clean the engine because dextron is a great detergent.

So did it fix my problem? Not after the first start after adding trans fluid, but after the drive home, and a restart.... Guess what?

No popping

Might be your problem, might not, won't hurt to try though, and no one else is offering up any other ideas.

 

One day I was out at my buddy's shop (before I worked there) and since he was the local 6.5 know-it-all, I brought it up to him.

"Put 1 quart of trans fluid in your oil"

Why? When you add trans (with dextron) fluid to the engine oil, it helps clean the engine because dextron is a great detergent.

So did it fix my problem? Not after the first start after adding trans fluid, but after the drive home, and a restart.... Guess what?

No popping

Might be your problem, might not, won't hurt to try though, and no one else is offering up any other ideas.

I have heard of this in gassers too, to solve sticky lifters, etc... Tranny fluid in the oil....

 

is it safe to leave in for awhile?

 

Never hurt anything while I had it in that I could detect, and why would a friend who KNOWS the engines and is in the business suggest something bad I figured, I trust him, and also I do regular change intervals.

 

The best one to clean sticky ring pack and lifter is a product called Auto-RX.

Let me know if you need to know more, I can direct you to the site or check BobIsTheOilGuy forum, in the Oil Additive section.

If you put in new stuff, may want to check the compression on each cylinder to see if you get good compression first or fix your problem.
Engine is fairly young.

 

Not an issue with a hung up valve?

So far it looks like just a lifter issue rather a sticky valve causing the lifter to slam into the pushrod.

 

So far it looks like just a lifter issue rather a sticky valve causing the lifter to slam into the pushrod.

If it was a stuck valve, you wouldn't hear a popping, rather a banging.

 

Tried the Detergent

Thanks guys, I tried the oil detergents. I still get the exhaust through the intake for a while at startup. Are there any other sugestions before I remove the heads.

 

Thanks guys, I tried the oil detergents. I still get the exhaust through the intake for a while at startup. Are there any other sugestions before I remove the heads.

I would run the motor for awhile before you remove the head(s). When a valve runs in a particualer spot for awhile you get sludge on the valve stem in the spot that doesn't see the valve guide.

Now if you depress the valve past this point you have minor sludge that gets in the valve guide. When cold this makes the valve hang slightly open for a very short period of time until it works loose and pops shut.

Since you hear it in the vehicle I wil make a WAG, (wild ass guess) that it is an intake valve and not an exhaust valve since the intake valves are famous for this on the 6.2 and some 6.5 N/A systems.

I would suggest driving as it will not hurt anything if it is only at start up. My new rebuild did this for about 5000 miles since I made the valve guides tight with new inserts installed. Only one did it because I made the one insert a few thousands tighter by mistake. Oh well it never hung at speed just start up.

 

I did have coolant loss

Thanks Stateman,

I did have coolant loss for a while with the associated jello in the PCV and valve cover. The coolant loss seems to be cured with the GM seal tabs and wondered if you thought that might cause a valve to hang?

Very cool intercooler also.

 

Thanks Stateman,

I did have coolant loss for a while with the associated jello in the PCV and valve cover. The coolant loss seems to be cured with the GM seal tabs and wondered if you thought that might cause a valve to hang?

Very cool intercooler also.

I suspect that could have definitely contributed to the problem. I dare say you may see it back, the coolant loss, probably no the valve problem.

Thanks, the intercooler works great.