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5.3 Oil In Intake

92Rustang

By 92Rustang
in Ask A GM Technician

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92Rustang Enthusiast

92Rustang

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Posted

Hey guys I just did a new intake gasket install this weekend. When I went to clean the intake I noticed a liquid in the back of the intake. I turned it in every direction but could not get it out. It is oil and I think it is coming from the PCV, but is this normal? There seems to be a lot in there. Thanks

'94 9c1 novice Enthusiast

'94 9c1 novice

Posted
Posted

Yep. Normal. I did my intake gasket because I thought I had an intake leak. Turned out to be the water pump. Anyway, I wanted to clean my intake ports out because of all the crust built up and when I tilted the intake with the throttle body near the floor, about 2 to 3 oz. of oil drolled out. I did a little resarch and found out this is a problem with this style intake. Fortunately for us, the PCV hose is connected at the top and not near the throttle body like on some Vettes and F-bodies. There is a "catch can" mod they have been doing to keep the oil from getting into the intake. I cleaned the oil out of my intake with some brake cleaner and kept tilting it until very little came out. I figured it was 150k miles of oil but wasn't enough to worry about. Not sure how to get it out after it's been reinstalled though. Hope this helps.

'94 9c1 novice Enthusiast

'94 9c1 novice

Posted
Posted

150k on the truck & covered with years of oil. I'm sure the brake cleaner didn't hurt. The teflon coating was long gone by now. I was wondering myself what to clean it with, mainly the contact surface for the gasket, but couldn't find ANYTHING online about cleaning the internals of a plastic intake so I went with a oil solvent. If it was a new truck I might be concerned. Couldn't make things worse than what they already were. :banghead:

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