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Does cleaning out the intake manifold have any measurable effect? #5383186 03/22/20 06:35 PM
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atikovi Offline OP
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Changed the spark plugs and wires on my 99 Taurus with the 24V Duratec V6 and you have to take off the upper manifold for access. It only has 62,000 miles so it wasn't too dirty, but I cleaned the lower manifold.

Before,

[Linked Image from fototime.com]

After,

[Linked Image from fototime.com]

Does this make a noticeable difference in performance? The upper intake is similarly dirty. Should I clean that too?

Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383194 03/22/20 06:46 PM
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Dave9 Offline
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No, cleaning it makes no difference except where the deposits cause restrictions. I suppose it could be argued that thick deposits make a small restriction anywhere for a tiny % benefit. However it may reduce the rate at which any local sensors get fouled, and of course help to make a better seal where gaskets are involved, and reduce the chance that any later (especially cleaning solvent sprayed in) dislodged chunks of deposits could make their way to valves and cylinders.

If having it apart makes a PCV valve easier to access, now might be a good time to replace that too.

As far as cleaning the upper intake, sure why not? I just wouldn't do much more than a spray cleaner, no elbow grease and scrubbing unless there's thick deposits stuck in place.

Last edited by Dave9; 03/22/20 06:49 PM.
Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383196 03/22/20 06:51 PM
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atikovi Offline OP
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OK, at least it looks pretty.

Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383219 03/22/20 07:30 PM
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Leo99 Offline
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Originally Posted by atikovi
OK, at least it looks pretty.


Looks a lot better. Brake cleaner?


Without data you're just another person with an opinion. W. E. Deming

2003 Corolla 250,000 miles (RIP)
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Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383247 03/22/20 07:57 PM
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atikovi Offline OP
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Carb/TB cleaner.

Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383293 03/22/20 09:05 PM
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Railrust Offline
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Measurable effect? Not really but it couldn’t hurt.


2018 Chevy Silverado 5.3
2007 Lexus LS460 (deceased)
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(Whatever synthetic oil is on sale or rebate)
Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383384 03/23/20 02:13 AM
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GMBoy Offline
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Without all that crud absorbing some of your fuel mixture, you might find a hint more reponsiveness if anything. Regardless - it needed to be cleaned since it was all apart anyhow.

Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383398 03/23/20 05:07 AM
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Lubener Offline
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I was told by someone once that a lot of carbon there could lean things out. I am on the fence with that. Myself, I would clean it up since it is staring me in the face and could prevent those throttle plates from sticking someday.


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Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383559 03/23/20 09:46 AM
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CT8 Offline
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Where did all the stuff go that you removed from the intake runners?


2015 F150 2.7
2018 F350 6.2
Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383564 03/23/20 09:49 AM
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atikovi Offline OP
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It will probably get burned up the next time I start it.

Re: Does cleaning out the intake manifold have any measurable effect? [Re: atikovi] #5383625 03/23/20 10:57 AM
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Fordiesel69 Offline
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I think it is worth cleaning. You would need an engine dyno to see the difference, I dont even think a chassis dyno would be able to tell. That 3.0L duratec must have been a costly as none in my area have the badge. I remeber the mercury sable I drove had that engine and it was very smooth and quiet compared to the vuclan 3.0L push rod engine.


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