'05 Silverado Z71/1500 - Spark plugs 4 are tan, and 4 are BLACK carbonized?


Hello, back on March 5, 2011, of this year, I posted this message about my truck here on this site, and a few problems that I was having.

2005 Z71 Silverado Truck
4 Wheel drive
5.3
1500

“In the last few days I've noticed an oil leak that seems to be leaking under the intake manifold towards the back top of the engine. Just curious if anyone here has dealt with this before and where the problem could be originating from?”

“Also, are there any FREE online Chevrolet 1500 trucks "HOW TO" guides as far as tearing this area apart? I think Chilton or other manuals online cost lots of money. I called a local shop and they wanted about $800.00-$1500.00 to fix it, and I can not afford that at this time....or any other time, for that matter. I thought maybe the valve gasket cover has blown.”
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……And yesterday, July 16, 2011

When I pulled the 8 spark plugs out (not to mention the plug wires falling apart, the four plugs on the passengers’ side looked the normal tan color, but the remaining four on the drivers side were all black and really carbonized. What would be the first place to be suspicious of, and what other scenarios would cause these two different engine sides of the spark plugs being black and then normal tan color on the other side?

So, I changed the spark plugs and wires, and the truck runs great, then runs like hell after it warms up, some part must be out,….or worse!

Thanks for any replies.

 

Replacing valve cover gaskets is really fairly simple and I'm sure one of the guys on here can give you a pretty good rundown on the procedure. The one bank being fouled I'm not entirely sure about unless it has to do with the intake. You'll definitely get an answer on here thougj

 

Intake manifold gasket comes to mind. Never done it on that engine, but I'm sure it's about the same as any other. I say go over to a parts store and pickup a haynes manual and read about it. There's important torque specs in there on how to torque the intake manifold back down so it wont leak again.

 

your chiltons manual will give you torque specs on almost all bolts for the the engine and also
if your vacum lines leak it will cause yoru truck to run like hell also if your o2 sensors are really bad it will run like hell also pull the codes first i would suggest going to a local autoparts store and useing there rental scanners