UVA3rdGen

This question refers to my 92 305 TPI and my buddies POS 93 3.1 V6. How does oil build up in the intake? It does not seem to make intuitive sense to me. My cars plenum was coated with a think carbon residue, but my buddies car had oil leaking out of the intake from the throttle body when he turned the car off. I assume what caused the carbon in my car was the EGR valve, but what could cause oil to come up into the intake like that? Bad valve stem? Why would the oil and carbon not get sucked into the cylinders? How could the oil come all the way up to the throttle body?

Monty

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[This message has been edited by Monty (edited February 12, 2001).]

The ODB

It comes from the PCV that enters the passenger side of your throttle body.

ODB

UVA3rdGen

Does that mean his PCV valve is bad?

mtx28

or... oil gets on my intake from under the valve covers, put some new gaskets in

Vader

Most likely blowby gasses returning up the PCV vent tube to the throttle body. Thats a sign of excessive ring wear and poor sealing, or excessive boost pressure from a blower or turbo.

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Later,
Vader
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UVA3rdGen

Ahh, that makes sense. Thanks for the info guys.

burnoutrpm

how many miles are on the engine???

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 160 (882) heads,.447/.447 lift 222@.050 duration speed pro 327/350hp cam 350 .40 over (356) Edlebrock torker2 and a 600 edlebrock manual choke (1405)

Future mods performer rpm air gap intake (polished) comp roller cam, and way better headsa 400 defintely in the works!

UVA3rdGen

Mine = 22 thousand
His = 89 thousand, the last 100 miles with out much oil in the crankcase and overheating.