There is no PCV valve, simply a hose running from the valve cover to the resonator box. I recall another member having a similar problem and it turns out the tabs under the valve cover were preventing oil from draining properly, allowing oil to get sucked through the hose, into the intake.

 

There is no PCV valve, simply a hose running from the valve cover to the resonator box. I recall another member having a similar problem and it turns out the tabs under the valve cover were preventing oil from draining properly, allowing oil to get sucked through the hose, into the intake.

hmm, that would also explain the smoke when cranking after running at highway speed.

Thanks

 

Sounds like your return holes are clogged in the head. Pull the valve cover off and see if it is all gummed up.

 

I have an 05 Rado with 85K miles thats using / losing oil as well. Usually a quart about every 2k miles. Truck has had only full synthetic used after break in.

 

My mechanic removed the return hose, air box, throttle body, intake hoses. Everything from the air filter to the intake has oil in it, so we feel sure this is the problem. haven't got the valve cover off yet. Didn't know you have to remove the intake to get to the valve cover. this is a bit more expensive than I was thinking.

 

The mechanic finished mine. From what I understand, the hose is connected to a baffle under the valve cover with some tabs hanging down. That and some gunk stopped up the oil drain. Haven't driven it to confirm that yet.

Sounds like an easy fix, but the intake has to come off to remove the valve cover, so it will be about $400 when finished. Better than a worn out engine though.

My cruise control quit last week, mechanic said it was caused by a tail light bulb gone out.

Now I can go back to work on the purge control valve.

I'm finding it hard to love this truck, is all the little querks gonna come to an end?

 

Well, with 125K on the odometer, it could be considered that it is going through a mid-life crisis. When you throw a little money at a mid-life crisis, it seems to make things go a little easier. At least this has been my experience........................................ :mrgreen:

 

Well, with 125K on the odometer, it could be considered that it is going through a mid-life crisis. When you throw a little money at a mid-life crisis, it seems to make things go a little easier. At least this has been my experience........................................ :mrgreen:

well, that explains my problems with the crotch rockets. :lol:

CORRECTION: The cruise control problem was the brake light switch, not the bulb. I should have known better!! :roll:

 

Another clarification: The oil drain hole in the head wasn't stopped up, the factory sealant on the baffle had worked loose, and he thinks the oil was being sucked up through the baffle. The tabs had something to do with it, but not sure what it was. Do not go to the expense of doing this untill I have put some highway miles on it to see if it is still using oil. Did 50 miles today at 55mph, and no oil was consumed, but this isn't a reliable test. I will be able to get on the interstate Friday and do 100 miles at 75mph. I will know for sure then.

 

Another clarification: The oil drain hole in the head wasn't stopped up, the factory sealant on the baffle had worked loose, and he thinks the oil was being sucked up through the baffle. The tabs had something to do with it, but not sure what it was. Do not go to the expense of doing this untill I have put some highway miles on it to see if it is still using oil. Did 50 miles today at 55mph, and no oil was consumed, but this isn't a reliable test. I will be able to get on the interstate Friday and do 100 miles at 75mph. I will know for sure then.

keep us posted.

 

There is no PCV valve, simply a hose running from the valve cover to the resonator box. I recall another member having a similar problem and it turns out the tabs under the valve cover were preventing oil from draining properly, allowing oil to get sucked through the hose, into the intake.

That was me. 20,000 miles since the repair and no problems.

viewtopic.php?f=8&t=49406&hilit=oil

 

I ran 70 miles at 75 mph, and another 40 miles at 65 mph with no oil consumption. This distance and speed should have used a quart of oil. So I'm thinking its fixed, but for some reason, I'm still a little apprehensive.

I will continue to post reults.

 

Good info bro, sounds like you've got a good mechanic.

BTW we don't have serviceable PCVs, they're actually a small orfice hole in the valve cover that the hose attaches onto. There was some issues with them getting plugged up in the earlier 04-06s and the entire valve cover ended up getting replaced but thats about it.

 

I wish I had seen exactly what he did, but my understanding is that the baffle is submerged in oil, or has a lot of oil around it on the head. Some of the sealant worked loose, allowing oil to come around the edge of the baffle. The tabs were obstructing something, and he moved them around some, but not sure what he did, but he said it looked sort of obvious. He thought the real issue was the sealant.

 

I have the exact same problem Scouch describe on the first post, i decided to fix it myself...what a pain to remove the intake manifold.... at the end i did found the valve cover gasket broken and the tabs under the cover too dirty.

 

is there a sticky on this procedure? the link KCinMI posted isn't good.

 

even with the valve cover of my mechanic said the baffels are sealed ,no way to clean or bend tabs .... I told hin to spray it out with brake cleaner . has been fine since ...next time I will just blow air in from my compressor and not remove valve cover ,which is a huge job

 

I just capped mine for a long time ... and stopped the oil burning and smoke . Fixed it when cylinder head went out . no compression on #3 cylinder @ 160,000 miles

 

Had to pull up a long ago thread. I have somewhat the same symptoms as the OP. If i stay off of the highway my truck never smokes when started. I work about 15 miles form the house. when I go to work i drive on the highway then get off the exit go about .5 miles and park. When I start it up to go home it smokes for a minute. Then I drive home on the highway get off the exit drive about 5 miles and park. when started it doesn't smoke. Really weird. Any ideas? maybe I need to remove valve cover and clean. Is there a better write up? I have a 2004 3.5 Colo. Thanks.

 

Could be stem seals if you park after a long drive with the engine hot. Of course it all depends upon mileage. If you are up around 180 thousand or more it is possible and a frequent problem with more than just GM engines.

The stem seals heat up and seal, if you sit after a long hot run then they shrink and let a little oil through until they warm up again. It does not sound like you have the same problem as mentioned earlier in this thread otherwise the smoke would be much worse and last much longer.

I have had several 4 cylinders and one v8 that developed intermittent stem seal leaks at 150-200 thousand miles. In all cases I changed the seals and in the case of the v8 changed a weak spring and a couple of warn rockers.

This is not major engine repair but can lead to more serious issues if left unattended causing at a minimum bad carbon build up and cat converter plug up or as my brother calls it catyleptic corn boiler congestion. ;-)

 

I am having this same issue. I work an hour from home, and after the drive i let it sit, and then after a couple of hours at around 10am i go out crank it and it smokes then disappears. This is the only time it smokes on the same drive home let it sit for a couple of hours and it doesn't smoke so i am leaning towards moisture getting into the exhaust somehow since this is the only time it does it, and yes i have to take interstate to work. This didn't start until February after changing oil and spark plugs which i guess is a coincidence , but its funny cuz up until that point i never had to put any oil in my truck besides oil changes, now i know in the past month i have bought 4 quarts of oil, and the fuel consumption differs daily on the same exact drive which has me at a stand still, so if there is anything anyone can help me with suggestions would be greatly appreciated.. the smoke is embarrassing, at least if i crank it at 10 it doesn't smoke at 3 when i leave from work. Oh and is there drain holes in the muffler that could be stopped up that could cause this moister if that is what it is.???? please help...

 

Hey guys, I'm new here so late it easy lol. I've been experiencing the same problem as the op. I drive about 55miles on the highway round 70-75mph, the trucj sits for about 8-9hours while im at work, i leave work and it appears as if someone has thrown a smoke grenade under my truck, but i again drive the excat same way home, let the truck sit over night, and very little smoke in the morning, i cant seem to figure this out, ive been told many different possibilities as to what cpuld cause this, ive recently developed a misfire in random cylinders, when i did my spark plugs last i noticed there were soaked in oil, but i only really starting noticing the smoke after i did an oil change... Hope i didnt confuse anyone, and ideas or advice would be greatly appreciated.

 

I just developed this problem. Is pulling the valve cover and cleaning the tabs the fixed? Thanks

 

I have the same engine and I'm almost positive that this is my problem. (The baffle and tabs problem) I have a question and maybe a solution could I add an oil catch can kit between the valve cover and the where it hooks back into the resonator box?

 

I have a "2005" Canyon with an I-5, it suddenly developed a problem with smoking heavily at start up. I tried to deduct what the problem could be, it happen suddenly so it's not valve stem seals. I found another Canyon owner who said he had the same problem previously, he told me that the pcv valve is plugged and when I start my truck the intake sucks the oil that didn't drain off the pcv system plates, once it sucks all the remaining oil off, it quits smoking. It turns out that some genius at Gm decided to put the pvc system underneath the engine cover, the top of the motor. And the plate in the pvc system has a small hole in it that lets the oil drain off of it, well after awhile this hole becomes plugged and causes it to occasionally smoke heavily on start up. I had to take the alot of stuff off the motor to get to two bolts covered by the intake manifold. I have a GM repair manual that was offered in the owners manuals it told me how to get the cover off, I had to loosen the AC pump also, it was a big job for a DIY guy like me, but I got to that plate and unplugged the hole, and drilled two more the same size near the original hole. Put it all back together and hoped for the best, and I'll be, it worked and has never smoked again. If you do this, get prepared, you will need some new gaskets, and some time. I took mine apart on a Friday after work, and put it back together on Saturday. Take your time and take many pictures of the way things were before you took it apart, it will help. Good luck.