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Cleaning the Intake manifold?

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Old 05-20-2003, 01:39 AM
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Default Cleaning the Intake manifold?

russianpolarbear posted this and I wanted to check around and find out if this is safe to do with all the sensors on newer cars, I have done it on older cars and small engines, and if I should look into doing it with my 126k miles.

Remove the air intake hose from the TB, and also remove the MAF sensor (if you dont' the car cleaner will damage it.) with an assistant, have them start the car for you (if you do it yourself it will keep dying on you) and feather the throttle while spraying the carb cleaner into the engine. The engine will probably hiccup quite a bit and may want to stall. When it does this, stop spraying and it will steady itself back out. Keep doing this. I used an entire can of carb cleaner cleaning out the intake manifold with the engine running and man, there was so much char looking smoke coming out it was unbelivable! You will want to rev the engine through all different RPM ranges as you do this, but don't rev it too high obviously...
I hope this post will be of some use to some people.

while I'm on it, since I've never had a supercharger before.. is the carb cleaner still safe to use on the supercharged engine? I've only done it on my 88 before, and it worked great for it and caused no problems...
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Old 05-20-2003, 01:47 AM
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I wouldn't use carb cleaner. MAYBE intake safe cleaner, but with that plastic upper intake, I'd still hesitate. The other thing to consider is all that gunk is clogging up your catalytic converter now.

Stick to the old mechanics trick. Spray WATER in there.
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Old 05-20-2003, 01:52 AM
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B12 dries without residue. But water is better to put into my intake manifold? I am guessing you put it in a little spray bottle? What could carb cleaner do to a intake manifold? Didnt think there was much combustion going on there?
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Old 05-20-2003, 02:00 AM
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Carb cleaner is a solvent. Ever spray B12 on a bug? Dissolves it. I wouldn't let B12 anywhere near anything plastic. Combustion is unrelated.

Just put some water in a little spray bottle and gently mist it in, just above the stall threshold. That'* the safest method. If you're worried about gunk in your intake, it might be time to remove and clean your TB.
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Old 05-20-2003, 02:09 AM
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Lol bugs arent plastic... lol

Oh and my TB is clean......sppppottttttttlessss, about 100k highway miles I reckon
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Old 05-20-2003, 04:08 AM
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Betcha a 12-pack that if you pull off the TB and look at the back side of the throttle plate and inside the bore, it'* black as soot.

My car was a museum piece with only 70k granny miles when I bought it, and it was NASTY. Should be cleaned probably every 50k miles. I noticed a slight gain in performance.....most notably a crisper throttle response, when I did mine.
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Old 05-20-2003, 11:03 AM
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Ya probably, I was just talkin bout the main body of the TB. Just needa go buy a spray bottle or empty my sisters perfume bottle out...
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Old 05-20-2003, 07:58 PM
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So true so true...about the black as soot throttle body anyway. It is safe actually to clean the throttle body with carb cleaner. All you need to do is clean it up with a rag. Definitley don't put the stuff on plastic. I cracked my taillight....um....don't ask :(
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Old 05-20-2003, 08:34 PM
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Ill take credit for the post but I didnt post that sounds like a decent idea tho
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Old 05-21-2003, 01:19 AM
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Oops it was Custom88 that posted that.
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