Throttle body cleaning - Hyundai Genesis Forum
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post #1 of 9 Old 08-01-2019 Thread Starter
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Throttle body cleaning

I am having some lag with my throttle. And the other day my throttle completely stopped working while driving with a very slow increase in rpm. I plan on cleaning it out but I am not a car guy and haven’t done it before. I’ve heard people take it out completely and I’ve also heard people spray cleaner in while engine is running. Which is the best option?
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post #2 of 9 Old 08-01-2019
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Best way is to remove it. Spraying won't get all the carbon out around the shaft pivot points.

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post #3 of 9 Old 08-01-2019 Thread Starter
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That’s kinda what I figured! In your experience do you think that could be what happened? Or could the throttle body be going bad?
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post #4 of 9 Old 08-01-2019
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I had the same problem, check engine came on. Codes for reduced power popped up.

THE FIX:
I disconnected the battery, discontented the throttle body, then removed the throttle body completely. Get some throttle body cleaner from Autozone.
Once removed, you can manually keep the butterfly flap open and clean every nook and cranny.
Put it back in same way it came out.
Your good to go!

Ready for some donuts.
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post #5 of 9 Old 08-01-2019
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I've recently started using moly grease (assembly lube) for mine.
The grease is one that is hard to break down, so it should last a while.
I'm just going to check it from time to time.
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post #6 of 9 Old 08-02-2019
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Ive cleaned mine on 3.8 bk1 without removing it. Removed the MAF and cleaned it separate. Had an assistant go in car, put it in accessories mode, then hold the gas pedal down to open the butterfly. I then sprayed and wiped what I could, from the outside. I didnt have a replacement gasket otherwise would have removed it. Some have reported that the butterfly doesnt open on their's using this technique. It could be since mine is bone stock. Its super simple to do this. Probably just need a phillips IIRC.

2010 Genesis Coupe GT 3.8 Auto
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post #7 of 9 Old 08-08-2019
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Remove it for sure. Set it on a table with a rag underneath, then soak it with throttle body cleaner. Then take a clean rag or shop towel and scrub the gunk off (adding TB cleaner if necessary). Then flip it over and repeat. Make sure to open the valve and get between the plate and housing. Maybe spray it once more to make sure. Then let it dry.

Cleaning it without having it removed as Gen10 discussed could be dangerous. If something malfunctions and it decides it needs to close, you might end up with a couple less fingers.

Its pretty easy to remove you just have to take out the intake piping, then remove a couple some coolant lines, and take out the bolts that connect it to the intake manifold.
Just make sure when re-installing it, not to over-tighten the bolts that connect to the intake manifold. You don't want to strip that aluminium.

Here's a link to the torque specs, 2nd table down, you should see a number on the head of the bolt that will correspond to the correct torque spec:
https://www.genracer.com/torque-spec...genesis-coupe/
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post #8 of 9 Old 08-09-2019
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On my 2L the only way to open the throttle plate is by hand. You cannot open it via the gas pedal without the engine running.

2010 Red 2.0L track

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If the Pharaohs had duct tape, the Sphinx would still have a nose...."
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post #9 of 9 Old 4 Weeks Ago Thread Starter
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Forgot to update. Took the throttle body off and it was super dirty. Cleaned it off and seems to have fixed the problem completely. Much better throttle response! Thanks!
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