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Engine ping a starting around 4000RPM

Crownie225

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Crownie225 New Member

Crownie225

Posted
Posted

I purchased a used 2001 Yukon with the 5.3L about 2 months ago. I have noticed when acclerating hard at around 4000RPMs I get a engine ping and have power issues. I have been running 87 octane. When using 89 octane I get less ping but it is still somewhat there. Anyone else run into this. This Truck should run fine on 87. I worry about this due to towing a boat and I know that I will be reaching these Rpms while towing. Any Thoughts!!!!

redvett Senior Enthusiast

redvett

Posted
Posted

Have a good tech with a scanner go for a ride and have him scan & read knock counts along with all other data. Its possible you have knock sensor problems. You should not have any spark knock if everything is working OK.

C & A s Dad Senior Enthusiast

C & A s Dad

Posted
Posted

I would agree with redvette except I would add that you likely have carbon build up. We see it often. Truck runs great on 87 oct then it gets some miles on it so it begins pinging. Owner moves to 89 octane and it corrects the pinging for awhile then it rtns. The owner moves to 93 octane and once again the pinging goes away but later rtns.

 

The carbon in the combustion chambers does two things. 1) it increasese the compression which automatically increases the Octane requirements. 2) It acts like a glow plug, becoming glowing red in the comb chamber and actually ignites the fuel before the spark plug has a chance to. The pre-detonation (pinging) is the result.

 

If it is carbon in the combustion chamber, you can try adding Techron for a tank or two. Not the Chevron Fuel Injector Cleaner "with Techron". I mean the full strenth stuff. It will cost you about $10.00 for a 20 oz bottle. Run it at 1 oz per gallon and run the tank close to empty and then do it again. If this does not correct it you likely do have a sensor problem or you will need to have the upper cylinders cleaned with a Motor Vac or BG machine. Some people use Seafaom and it is a wonderful product and we sell an ocean of it every month. However, IMO, The Techron is better for cleaning the comb chamber and valves.

 

I would love to know what you end up doing.

99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
Posted

Run some Seafoam through the booster vac line and PCV line. These trucks are good about sucking oil back through the PCV hose and barfing it into the intake mani. All that wonderful oil gets burned in the chambers and caked onto the piston crowns and everything else. If you yank the intake manifold off and peek at the intake runners youll see what every 4.8, 5.3, 5.7 6.0 looks like with fairly high mileage and no catch can.

 

PRETTY!!!!!!!!!!!!!!! Not from my engine. Im running an LS6 valley cover and AMW catch can. Catch can has a few tablespoons of oil I empty at oil changes.

461109_66_full.jpg

 

 

 

99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
Posted
Jared, I have heard the term "catch can" before but really do not understand what this is or how it works. Can you explain further?

 

 

 

 

Its a small can that hook in-line with your PCV hose before it hits the intake manifold.

can1.jpg

Its got a stainless mesh on the inlet side being the top fitting. The incoming oil laden air strains through the mesh catching the oil. When enough gathers in the mesh it drops down into the sump of the can. The AMW can has "stepped" internal sides to keep the oil from climbing and being sucked back into the engine. Overall they do work. The AMW has increased in price considerably. I got one off LS1Tech cheap. Thats the only reason I have it.

clearcan.gif

 

http://www.ws6project.com/user_stor/catalo...00b7884bb94b9f1

http://www.accmachtech.com/pcvcatchcans.htm

C & A s Dad Senior Enthusiast

C & A s Dad

Posted
Posted

Thanks Jared. This makes perfectly good sense. I am going to look at my pcv lines and see if I have any oil at all in the line. Is there anything else I should be looking at? I do not mind adding one to my 5.3 if I need it but do not want to add it if I don't.

 

Crownie 225, sorry for highjacking your thread.

99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
Posted
Thanks Jared. This makes perfectly good sense. I am going to look at my pcv lines and see if I have any oil at all in the line. Is there anything else I should be looking at? I do not mind adding one to my 5.3 if I need it but do not want to add it if I don't.

 

Crownie 225, sorry for highjacking your thread.

 

 

 

 

Not a problem. Just check the hoses. See if anything just flat drains out or if they are wet. If your really bored, yank the intake tube and TB off. Then look into your intake!!! Itll be a nasty brown in there.

 

Another thing you can do is switch to the fixed orifice PCV valve. It just has a small hole in it versus the pintle a normal PCV valve has. This was GM's supposed "correction" for the oil consumption issue.

C & A s Dad Senior Enthusiast

C & A s Dad

Posted
Posted
Thanks Jared. This makes perfectly good sense. I am going to look at my pcv lines and see if I have any oil at all in the line. Is there anything else I should be looking at? I do not mind adding one to my 5.3 if I need it but do not want to add it if I don't.

 

Crownie 225, sorry for highjacking your thread.

 

 

 

 

Not a problem. Just check the hoses. See if anything just flat drains out or if they are wet. If your really bored, yank the intake tube and TB off. Then look into your intake!!! Itll be a nasty brown in there.

 

Another thing you can do is switch to the fixed orifice PCV valve. It just has a small hole in it versus the pintle a normal PCV valve has. This was GM's supposed "correction" for the oil consumption issue.

 

 

 

 

 

It has the fixed orfice PCV. I was going to change it when I bought the truck and brought one home from work. I pulled the old one and when it did not rattle I thought boy this thing is plugged with only 40K? Well it was not plugged, it simply had nothing inside it, it was a fixed orfice design. I am not loosing any oil now but as you said it could be a small amt pulling back through the lines. I will check them when I get back home in a few days.

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