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Dirty intake manifold, NORMAL???

2894 Views 7 Replies 5 Participants Last post by  Justin727
i`ve found this morning that the internal part of my intake manifold is impregnated with some sort of oilish sticky black thing all over, is this normal? or should i clean it? if i have too clean it, how to and what to use?

thanks 4 the help
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a can of carb cleaner and toothbrush lol
should i dissasemble the whole intake manifold or it can be made on site?
well I would remove the intake plenum and clean it outside the car. Normally you could spray in there but you can't see anything...
i took a look at the manifold assembly, taking it apart is kinda pain in the -you know- , and should take a lot of time, so, is there a problem if i let it like that for a while?
I think mine has been like that for a couple of years. On a friend's '94 Corolla it has never been cleaned and the only problem that developed like a year ago, was that the throttle plate was kind of sticking in the closed position. Nothing major, just that it was a slight resistance when depressing the throttle pedal in the morning. And also the idle air control valve got somewhat sticky.

Of course a clean manifold is better than a dirty one, but it is not a major problem. The oily residue comes from the crankcase vapours that are directed into the intake through the Positive Crankcase Ventilation (PCV) valve.

Haynes manual recommends to clean the area around the throttle plate and be done with it.
my exhaust manifold is cracked
soo any of u guys have any idea how much wud it cost to replace it
my exhaust manifold is cracked
soo any of u guys have any idea how much wud it cost to replace it

Hit up ebay. You can find one under 100

It's not a PITA to take apart the upper plenum. 6mm allen sockets and 2 12mm nuts and walla. But disconnect the throttle cable and you can just let the upper plenum rest out of the way. Although it may need cleaning too. Not a hard task. Just take your time with it and enjoy the work don't rush.
Afterwards you'll be A ok!
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