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Old 12-17-2005, 03:05 AM   #1
zzyx7
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1996 SL2
Default intake manifold cleaning

Hey guys,

I'm curious, how do you go about cleaning your intake manifold? I took my throttle body off a long time ago and saw that the manifold had a layer of black oily crud all over the inside. Do you just spray carb cleaner in through the throttle body? Should I do it while my engine is running or off? Thanks =D

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Old 12-17-2005, 08:23 AM   #2
amazinghl
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Default Re: intake manifold cleaning

Last time, I just took the TB off and clean it while the engine is off.

Be warned, the car will take a long time to get start afterward.

...
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Old 12-17-2005, 08:27 AM   #3
jambra1
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Default Re: intake manifold cleaning

Some addtional thoughts about cleaning the manifold:

http://www.saturnfans.com/forums/showthread.php?t=1466
http://www.saturnfans.com/forums/showthread.php?t=367

Speaking of carbon buildup, you may want to pull your EGR and clean it while you're in the mood. You can use the carb cleaner or TB cleaner on it.

http://www.saturnfans.com/forums/showthread.php?t=60814
http://www.saturnfans.com/forums/showthread.php?t=48349

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Old 12-17-2005, 03:21 PM   #4
Derekleu
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1999 SL
Default Re: intake manifold cleaning

Whatever you do, do not spray an entire can in the intake manifold, or through the throttle body (with it still attached), while the engine is off.

Trust me, I learned the hard way, do a search for "I think I just killed my saturn."

Mine was extremely dirty, so I gunked up my IAS and sent loads of carbon down into my cylinders and oil.

Take of the throttle body and clean that, stay away from the intake manifold.

(Or if you do it right, teach me how to do it)

...
1999 SL SOHC 138k

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Old 12-17-2005, 05:55 PM   #5
JS593
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Default Re: intake manifold cleaning

If i wanted to clean my intake header, i would just go to a junkyard first, get one that is used of course. Spray some Carb cleaner all over it, let is sit for an hour, and run hot water through it, do it a couple times to loosen the carbon... make sure its fully dry and swap over the cleaned header.

...
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Old 12-17-2005, 10:34 PM   #6
zzyx7
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Default Re: intake manifold cleaning

Thanks everyone for the responses!

Can I spray the carb cleaner while the engine is running? Derek, I remember reading your post. I'm afraid that if I leave my engine off and spray it, I might flood it or just wash tons of gunk into my cylinders all at once even if I only do half a can.

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Old 12-18-2005, 09:54 AM   #7
Bill-kaz-jr
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Default Re: intake manifold cleaning

It will stall if you are not careful. Be judicious with the spray.

Bill

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Old 12-18-2005, 10:23 AM   #8
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Default Re: intake manifold cleaning

I like dumping a couple cans of seafoam into the manifold through the PCV valve hose with the engine running and fully warmed up. Not only does it clean out the manifold, you get lots of really cool smoke.

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Old 12-18-2005, 10:28 AM   #9
Derekleu
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Default Re: intake manifold cleaning

My lesson was:

You clean the Throttle Body, not the intake manifold.

You remove the throttle body so the gunk on it lands on the asphalt by your feet, not inside your cylinders and oil.

You don't clean the intake manifold by just spraying it because it will send loads and loads of carbon deposits into what used to be your clean engine, causing all flavors of hell, including your EGR valve and passthrough getting clogged and severe rough start and running issues.

I agree with JS593 as far as cleaning the intake manifold, if you wanna do it, take it off first.

One thing I have heard of that I have not yet tried is the steam clean, where you actually pour water into the intake of a hot, running engine.

...
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Old 12-18-2005, 11:02 AM   #10
JS593
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Default Re: intake manifold cleaning

Quote:
Originally Posted by Derekleu
My lesson was:

You clean the Throttle Body, not the intake manifold.

You remove the throttle body so the gunk on it lands on the asphalt by your feet, not inside your cylinders and oil.

You don't clean the intake manifold by just spraying it because it will send loads and loads of carbon deposits into what used to be your clean engine, causing all flavors of hell, including your EGR valve and passthrough getting clogged and severe rough start and running issues.

I agree with JS593 as far as cleaning the intake manifold, if you wanna do it, take it off first.

One thing I have heard of that I have not yet tried is the steam clean, where you actually pour water into the intake of a hot, running engine.
Steam clean can work, but i would not recommend it, too much chance of hydrolocking the cylinders. If your really looking to tune your car down the line, you can always do a port and polish and new headers. At least you know you set aside the possibliltiy of a really nasty looking header.

...
92 SL1 SOHC TBI
Custom intake
Alpine deck, speakers, amp
JBL Sub
Ultimate amp
Volometer gauge mounted in dash
Magnaflow exhaust
....DEAD.... Car towed away Jan 18 2007. RIP

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