Throttle Bottle inlet from PCV valve clogged (Smoke?)

[niquattx]

Hi All,

I've got a 87 Chevy R10 305 TBI that has been smoking and burning oil for sure (blue smoke). I haven't driven it much since it started because I didn't want to damage it. Sometimes it will through a huge cloud of smoke on startup and on idle. It also can occur on acceleration at times, but is not consistent.

This was before I discovered the blockage on the inlet to the TBI. I have attached a picture. I had to use a wire to clear the blockage, but the PCV valve which I had replaced previously is functioning now. I know I need to rebuild the TBI, but before I do I would like to get it to stop smoking.

I haven't taking the valve cover off yet, but have heard that drain holes could be blocked. I can only assume that is how the PCV inlet to the TBI got blocked in the first place. Anyone have experience with this? I am going to take the valve covers off soon because otherwise I am at a loss.

[Jake Wade]

I have found many over the years with a clogged PCV port. It is best to remove the throttle body and clean the passage on the underside of the baseplate, change the base gasket while you are at it.

You will have to remove the valve covers and have a look, possibly you have a lot of sludge build up blocking the return holes, flooding the seals. Seals I am sure are due for a change if original.

[niquattx]

Thanks. I will grab a rebuild kit tonight and do that as well as check the return holes when I get a chance. I will let you know how it goes.

Thanks!