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2010 chevy silverdo 5.3 #4cylinder oil on plug/new piston…

Customer Question
2010 chevy silverdo 5.3...

2010 chevy silverdo 5.3 #4cylinder oil on plug/new piston and rings, stil oiling

Mechanic's Assistant: When was your last oil change?

New oil

Mechanic's Assistant: What is the model of your '10 Chevy?

Silverdo truck

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Yes

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

The only cylinder is #4 may fuel management

Submitted: 8 months ago.Category: Chevy
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Answered in 8 minutes by:
8/2/2017
Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago
david craig
david craig, Auto Mechanic
Category: Chevy
Satisfied Customers: 5,149
Experience: owner/mechanic at 3D Automotive
Verified

Hi Im David, thanks for visiting the site...have you replaced the valve cover gaskets?

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Customer reply replied 8 months ago
the spark plug is oil fouling
Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago

I under stand that. oil can be leaking from the valve cover gasket into the tube and getting past the plug.

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Customer reply replied 8 months ago
I do have a problem with cover, the center bolts holes are striped
Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago

thats probably whats going on then my friend

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Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago

I have seen this many times. the oil gets past the plug and causes misfires.

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Customer reply replied 8 months ago
valve covers did not help at all
Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago

not if you have stripped bolts im sure they didnt help

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Customer reply replied 8 months ago
fixed bolt hole
Chevy Mechanic: david craig, Auto Mechanic replied 8 months ago

ok, then whoever did the rings didnt do such a great job. Ill open this up to others for their thoughts. good luck

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago
kalamykid
kalamykid, Shop Owner/ Tech
Category: Chevy
Satisfied Customers: 5,072
Experience: I HAVE OWNED MY OWN SHOP FOR OVER THREE YEARS. I HAVE THE TOOLS AND SOFTWARE TO ANSWERE ALMOST ANY Q
Verified

Did the person that did the ring job hone the cylinders? And why did the replace the rings?

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Customer reply replied 8 months ago
block went out too shop for sleeve on that cylinder, had crack, getting antifreeze on plug,ok reassemble new rings and rod bearings and new piston on that cylinder,now oil fouling
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

Where the rings replaced on any other cylinder?

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Customer reply replied 8 months ago
All
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

Where the valve guide seals also replaced?

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Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

How many miles have you put on the engine sense the work was done?

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Customer reply replied 8 months ago
about 25
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

Are any of the other plugs getting oil on them?

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Customer reply replied 8 months ago
the only one
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

Here is what I need you to do. Pull the spark plugs back out, and spray gumout carb cleaner down into the cylinder and do not by shy spray it real good. You want the card cleaner to go down past the rings and wash them out. Leave the plug out over night so the cylinder can dry out. Then the next day put a new plug n that cylinder and start the engine. With the engine cold run the rpms to 2500 and keep it there for ,15 minutes. Then let the engine idle for 30 minutes. This should seat the rings. Let the engine cool down for three hours and replace the plug again. Drive the truck for a couple of days and pull the plug out and inspect it. It should be a nice tan color.

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Customer reply replied 8 months ago
Ok I will do, I think its a seating problem also
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

If that does not fix it, then the valve guide seals may have been cut on installation.

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Customer reply replied 8 months ago
No had them rechecked, could not find anything wrong
Chevy Mechanic: kalamykid, Shop Owner/ Tech replied 8 months ago

Then it must be the rings not seating. There is no way for the valve cover leaking, to leak oil into the cylinder with the plugs in and tight.

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kalamykid
kalamykid
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Category: Chevy
Satisfied Customers: 5,072
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