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Discussion Starter · #1 ·
First time on here need opinion from others who know more about this vehicle. I have a 2006 trailblazer ext 4x4, 4.2 6 cylinder 220,000 miles. I noticed a burt oil smell a whole back so I pop the hood and look for any leaks. I see oil running down from what I assumed was the valve cover gaskets ( know a little but will admit nowhere near a mechanic . So I call my mechanic and tell him I'll pick up the gaskets and drop it off in a few days. Today he calls me back and says he isn't going to change them because I have severe blowby and it wouldn't do any good. I go pick up the trailblazer and bring it home, take off the oil cap while it's running. No smoke, no pressure coming out when I hold my hand over it. No ticking and runs smooth. Will admit it doesn't have the take off that my wife's 07 trailblazer does but can blowby cause this much oil? It has had a leak as of late fee drops under it right after I park. Did notice today that there was a drop here and there landing on the hot exhaust because you could see the smoke pop up and smell it burning more.
Bird Penguin Safety glove Textile Beak
Automotive tire Motor vehicle Gas Wood Hose
Automotive tire Hood Motor vehicle Fender Gas
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Automotive tire Tire Motor vehicle Automotive exhaust Synthetic rubber
Bird Penguin Safety glove Textile Beak

Automotive tire Tire Motor vehicle Automotive exhaust Synthetic rubber

Safety glove Automotive tire Motor vehicle Gas Machine

Automotive tire Hood Motor vehicle Fender Gas

Automotive tire Motor vehicle Gas Wood Hose
 

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Discussion Starter · #5 ·
does it blow blue smoke at start up? how often do you add oil if at all? if you dont need to add much oil between changes and its not coughing out blue in the morning then you just need the gasket, grommets, spark plug tube seals, and yeah spark plugs will get that pep back in your step. mechanic probably pulled a spark plug and the well had some deep oil in it. thats common, burns up plugs too. its from the seals leaking, not blow by.

look at rock auto for cheaper parts. some people will try to tighten the valve cover bolts up but id be careful. use a torque wrench if possible but if they are real loose you can gently snug them. wont help the plugs out much though
I put about half a quart or so every 3000 miles. No smoke at all other than when oil drops down on the exhaust. I took it to another mechanic and he confirmed massive valve cover leak ( which is what I originally thought ) I think the first mechanic just didn't want to bother with it. Thanks .
 

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Discussion Starter · #8 ·
just ignore me ... good choice.... bye
They looking into that too.
OK, I'll tell him.

You need to clean your PCV system! See this for more information and how to clean it.

Thanks.
OK, I'll tell him.

You need to clean your PCV system! See this for more information and how to clean it.

Thanks for the info. Love this vehicle and want it to last as long as possible. I am still learning when it comes to working on them though.
 

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Discussion Starter · #16 ·
Well went and picked up the trailblazer. Mechanic said the gaskets where very hard and brittle. When I mentioned pcv clog he did mention this vehicle didn't have a pcv valve but a system. ( which thanks to you guys helping I knew ) but lost faith when I mentioned the vent hose on the side and he said it only has the one on the top.. He did say while the intake was off he cleaned everything up and cleaned all the hoses and where they connect. I drove it the 10 min drive home and popped the hood to check his work. I pulled the dip stick out and held my thumb over it and there was suction (something I saw on a video by Joe Vreeland ). I'm not sure how much it was supposed to have but it was enough I could tell. Thanks for all the advice I will be checking for the signs and clean out that pcv system at the first little red flag from now on.
 
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