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throttle body cleaning

 
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  #1 (permalink)  
Old 26 Jun 2017, 03:51 am
RickinPA's Avatar
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Default throttle body cleaning

I had an interesting experience cleaning a throttle body on a Neon, but the information is applicable to any throttle body, even PTs.

The car in question has a rough idle. Having breakfast with my brother (a long-time mechanic), he mentioned he cleans throttle bodies with a toothbrush and diesel fuel (kerosene). It got me to thinking.

I had cleaned the throttle body with the usual method, wiping with a rag moistened with canned throttle body cleaner, followed with spraying the throttle body cleaner into the throttle body with the engine running. This is my usual yearly preventative maintenance. It turns out this wasn't enough to clean the neglected throttle body on our recently purchased Neon.

Materials:

Throttle body cleaner (or you could try kerosene, I trust my brother's recommendation).

A simple toothbrush (something without the fancy rubber scrapers, the solvents disolve the rubber and make a mess). DO NOT USE A METAL BRISTLE BRUSH.

An aluminum pan. I had some disposable ones left over from a party.

Some tools. If you're doing this, you should be able to figgure that one out.

Procedure:

Remove the throttle body from the car.

Strip the throttle body down. Remove the IAC valve (idle air control valve, if equipped). Remove the TPS (throttle position sensor), solvent could run down the shaft, into the the sensor and foul the resistive element. And remove any other stuff that could be damaged.

Block the throttle plate open if possible. I used a small piece of wood on the outside of the throttle body, where the the throttle cable attaches. DO NOT put anything inside the throttle body.

Hold the throttle body over the aluminum pan. Spray with throttle body cleaner and scrub the inside with the tooth brush. And scrub. And spray. And scrub. And spray. And scrub some more.

Inside the throttle body I was working on was a thin line of hard-to-remove gunk where the throttle plate rested. That's what you have to remove. Working in sunlight, I could see the line of gunk and watch it disappear as my cleaning work progressed. I finally removed all the gunk.

Clean out any interior passages and spray down the outside of the throttle body to finish cleaning it.

Dry the throttle body. Use a little compressed air to remove excess cleaner.

Allow throttle body to dry and reinstall.

I was amazed at how this smoothed the idle. It still has a low RPM problem, but that's another issue. When they say "clean the throttle body", on a neglected throttle body, it may take more than a quick wipe and a quick spray.
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Old 26 Jun 2017, 11:20 am
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Default Re: throttle body cleaning

nice post !
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Old 26 Jun 2017, 11:48 am
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Default Re: throttle body cleaning

I will probably have to do this pretty soon.

Would you recommend this to clean it?

KeroKlean Kerosene Fuel Treatment for Kerosene Heaters-PW-11 - The Home Depot
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Old 26 Jun 2017, 12:50 pm
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Default Re: throttle body cleaning

Where available in Home Depots Xylene
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Old 26 Jun 2017, 09:46 pm
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Default Re: throttle body cleaning

Clean the manifold airflow sensor with electrical switch cleaner also, or the cleaner you can buy. They get dirty and can mess up your idle.
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Old 27 Jun 2017, 03:29 am
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Default Re: throttle body cleaning

I'm not an expert, but this is my understanding of throttle bodies. They have a coating to reduce the likelihood of fouling. I believe the coating is in the fluropolymer family, similar to Teflon. The coating is sensitive to some solvents.

Spray cans of "throttle body cleaner" have taken this into account and so should be safe to use on throttle bodies.

The coating is obviously used where gasoline is present. Kerosene and diesel fuel are basically the same stuff, very similar to gasoline but less volatile. Since my brother (the long time mechanic) mentioned it, I added it to the post. I would be comfortable using it.

I would NOT recommend experimenting with other solvents, as they may damage the coating.
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Old 27 Jun 2017, 08:51 am
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Default Re: throttle body cleaning

I do not believe there is a coating on Chrysler throttle bodies for these years.

If there is such a coating and the body is fouled - so much for the long term efficiency of such a measure.

If you have moved into the realm of self maintenance then regular monitoring and cleaning when warranted is part of the game - especially on cars of these ages.
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Old 27 Jun 2017, 09:32 am
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Default Re: throttle body cleaning

If anyone might be referring to my suggestion of *Xylene in the experimental catagory I have only been using it for about 30 some years so maybe I am wrong about its use as a good intake parts (not electrical) system cleaner. I guess I should have mentioned I also and have routinely cleaned carburetors,supercharger rotors and gears,Turbo charger both cases and bodies oh and many, many....many dissembled Throttle bodies as well other like parts that can be completely disassembled decreased with a *chemical cleaner and then tossed in a nice big bucket of soapy water and even at times placed them in the dish washer for a good finish cleaning, (caution should be used what detergent to use for this purpose in the dishwater) mostly for the dry cycle that seems to get them nice and completely dry. There really is a common sence method to doing any kind of partial parts cleaning which is what really is being described by the previous responses.!

For DIY, the hint here is WD-40 or the like (applied lubricant in critical area's) when you are finished cleaning.

The use of any chemical cleaner even the ones that are specifically mixed for use of say Throttle Bodies or electrical should still be applied with a little caution. Like hair dye test a small area to be sure you dont get a rash on your skin or damage the part you are trying to clean! I think you get the joke here?


I guess for some using water and or water meth injection or E85 is really out, because all of those are highly damaging to many intake parts.
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Last edited by NitroPT; 27 Jun 2017 at 09:46 am.
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Old 27 Jun 2017, 09:49 am
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Default Re: throttle body cleaning

Quote:
Originally Posted by NitroPT View Post
If anyone might be referring to my suggestion of *Xylene in the experimental catagory I have only been using it for about 30 some years so maybe I am wrong about its use as a good intake parts (not electrical) system cleaner. I guess I should have mentioned I also and have routinely cleaned carburetors,supercharger rotors and gears,Turbo charger both cases and bodies oh and many, many....many dissembled Throttle bodies as well other like parts that can be completely disassembled decreased with a *chemical cleaner and then tossed in a nice big bucket of soapy water and even at times placed them in the dish washer for a good finish cleaning, (caution should be used what detergent to use for this purpose in the dishwater) mostly for the dry cycle that seems to get them nice and completely dry. There really is a common sence method to doing any kind of partial parts cleaning which is what really is being described by the previous responses.!

For DIY, the hint here is WD-40 or the like (applied lubricant in critical area's) when you are finished cleaning.

The use of any chemical cleaner even the ones that are specifically mixed for use of say Throttle Bodies or electrical should still be applied with a little caution. Like hair dye test a small area to be sure you dont get a rash on your skin or damage the part you are trying to clean! I think you get the joke here?


I guess for some using water and or water meth injection or E85 is really out, because all of those are highly damaging to many intake parts.
well Nitro 30 yeasr is not a very long window to see if something is really going to work or not
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Old 27 Jun 2017, 10:07 am
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Default Re: throttle body cleaning

Busted sent me this throttle body in the mail. it was in need of cleaning.

1.jpg




after Nitro told me to soak it in Xylene over night, it now looks like this:





2.jpg

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