robertbartsch

My plastic manifold is caked with a thick tar-like oil substance and it is currently off the engine while I am replacing the cam sensor and oil pressure switch.

So I was thinking of:

1. Spraying top engine cleaner into the manifold ports and cleaning them out with paper towels or rags

2. Putting the whole manifold into a bath tub filled with hot soapie water

3. Spraying the open ports with break cleaner and getting as much gunk out as possible with paper towels or rags.

Question:

So which is the best method; or should I just leave the oil gunk in place and not worry?

robertbartsch

Perhaps I should just swap back to the LS1 manifold which is not caked with oil-like sludge?

Krab

iTrader: (28)

When I got my LS6 intake, I bought a bottle of concentrated dawn dish washing soap and dumped half the bottle into a tub of hot water. I just submerged the entire intake in there for about 24 hours, and it came out pretty clean. Just be sure to let it completely dry before re-installing it. Wouldn't want to start the engine with some water in the intake.

Samba242

When I switched to the LS6 intake, I wanted to clean the old LS1 intake before storing it. There was quite a bit of oil build -up. I did like Krab did with the dishwashing soap ( I think it was Palmolive heavy duty or something) and soaked it overnight. Then I did the inside with one of those brushes used to clean tall glasses. ( like a 10" wire handle with a round brush at the end) Worked well and the manifold is like new.

Z28Venom

iTrader: (13)

I used GM Topend Cleaner... Intake was as clean as a whistle afterwards.

robertbartsch

OK Great.

On the back of the intake manifold there is an electronic sensor that I believe is connected to the brake vacuume line. I assume it is a vaccume sensor.

Questions: Will the soapie water hurt the vacuume sensor. I assume the GM Top Cleaner is OK on this point... Did anyone deal with the oil-gunk caked on the intake ports of the heads? How?

Thanks....

robertbartsch

so what about the sensor?

DrkPhx

iTrader: (15)

That is the MAP sensor. Be careful with it. If you're cleaning the intake off the car, remove the sensor first.

BTW - I sprayed engine cleaner in mine, then shot high pressure water (hose nozzle) in there to clean it. Worked great.

DaleMX

iTrader: (4)

Put the intake in a plastic garbage can, not the tub.

robertbartsch

Is there a trick to removing the MAP sensor from the back of the plastic intake? Is it just pressed in there and held with an o-ring?

Scalpel

iTrader: (4)

It should just pull out.

robertbartsch

OK, thanks