A gimmick? No, not at all.. I wouldn't pay a shop a couple hundred bucks to do it, by any means, but it's definitely something you could do in your driveway on a nice weekend and I'm fairly certain you'd see better throttle response and maybe better mileage? If nothing else, it's just good preventative maintenance. It's no more of a gimmick than changing your oil or spark plugs.

...and, knowing that it runs rich (as noticed with the exhaust), I'm sure it gets gunked up sooner than a naturally aspirated Santa Fe.

 

Thanks vanillathrilla,

Do you know where I can find steps to do this for the throttle body, turbo, and map sensors? I've looked high and low on the internet as well as this forum.

Thanks!

 

Ah lets not confuse the black exhaust yet. MAP sensors cannot be cleaned. MAS air flow sensors can so lets put that to rest. You can clean some throttle body so to speak with a spray cleaner but be aware that electronic throttle bodies are a severe safely hazard if you try. The black soot scenario well join the club of many and accept it as normal.

 

Dully noted, MAP sensors can't be cleaned. From what I've read, the Santa Fe does not have a MAS but rather MAP.

Sounds like I should not even bother cleaning the throttle bodies?

 

Dully noted, MAP sensors can't be cleaned. From what I've read, the Santa Fe does not have a MAS but rather MAP...

This is not an either/or situation. Most cars have both a MAF and a MAP sensor, and yours probably does too.

MAF = Mass Air Flow = tells the PCM how much air is going into the engine (accounts for both volume and density).

MAP = Manifold Absolute Pressure = tells the PCM the pressure in the intake manifold.

 

I would. I clean mine on the 2.4L every so often and run an intake cleaner through a vacuum line. Oh, and there is only one of them.

 

Cleaning the throttle body is of some benefit with idle control. Be very careful trying to do it with drive by wire cars.

 

So is the SFS drive by wire? What precautions should I take?

Perhaps I shouldn't even give it a try. Seems too risky.

 

I hadn't given any thought to that. My last vehicle that I did pretty much all the work on was a Jeep Wrangler. The last of the real Wrangler's before everything became electronic and plastic. You could take the whole thing apart in an afternoon with basic tools. lol

 

Being GDI I would definitely think it is. The throttle is controlled by the ECU and is unpredictable what will happen with the engine not running. They can close with a mighty force. As has been suggested the running a spray thru a vacuum line is probably the best and safest way. Most MAF sensors can be easily removed and cleaned with a spray cleaner. I would really think it is MAF but I am not sure.

 

On my Gen Coupe 2L T I have manually opened the TB when the engine is off with no issues. How else are you going to do it?

You could take it off and is probably the best way to clean it. You can look into the intake too and see what's up. May want to get a new gasket first though. I reuse the one on my Gen Coupe. My Accent one ripped when taking it off.

I just took my cable ran TB off my Accent with 157k miles on it. And I had first used a spray while reving the engine, similar to a seafoam treatment. It still had carbon near the pivot points that did not come off easily even in my hand with a rag and solvent..

 

I have manually opened the TB when the engine is off with no issues. How else are you going to do it?

I don't know how you manually opened the valve but having someone fully depress the throttle pedal would be a better way to do it than just pushing the valve open. The motor is supposed to drive the valve. It's not designed to work the other way round.

 

It's good to hear that the Hyundai TBs are not super sensitive to being moved by hand.
My 3rd gen Altima was the first gen that had throttle by wire and if you move the TB by hand the whole assembly is toast.
Many an owner wanted to clean up the TB and opened the butterfly by hand only to kill their TB.

I will keep that in mind when I remove the intake tubing to clean up the TB on my LF Sonata and my mom's 2018 Santa Fe.

 

No MAF in my 2013 2.0T. Some cars have both, but it's mostly those that use MAF as the primary input to the ECM, using a map for secondary input and other purposes.

 

You are right in that engines that use egr - Ford one of them are more likely to have both types of sensors, the primary AF calculation performed by the MAF, but that doesn't account for the additional intake from a EGR so MAF and MAP input is used to determine AF calculations, I believe BMW is MAF based though turbo engines which use a MAF will usually have a MAP sensor as well, that is the case with my Saab, or call it a boost pressure sensor if you prefer, sometimes what determines the name is where it's located, on the manifold or somewhere further upstream in the intake. Both serve to measure pressure somewhere in the intake system.

 

Isn't the reason some cars are fitted with both that the role of the MAP is to measure barometric pressure and boost pressure? I have never heard of the EGR coming into the equation.

 

wiki is reasonably accurate regards the map functions in a maf based system, it depends on whose scheme:

https://en.wikipedia.org/wiki/MAP_sensor

 

Interesting article. I was not aware of that process but it makes sense on how it tests the EGR system.

 

On most of the engine management systems I work with the MAF sensor is used to monitor EGR operation. It works in basically the same way. When the EGR valve is open you get a reduction in mass air flow because the exhaust gasses are taking up space (volume) in the inlet manifold that would normally be filled by the incoming air. It's been a while since I did the Hyundai engine management training course but I'm pretty sure that's how EGR flow is monitored on Hyundai engines.

 

You don't have all the OBD II stuff in the UK - do you ? In the states they have a number of gov mandated periodic self test requirements for the emission systems, included in that is the egr value, as wiki article explains the obd II sw does a self test during off throttle situations where opening the egr is detected as a pressure change by the map.

 

I think that's called message 5 (or6) if I am correct where it stores all the test data for confirmation when you get an emission test. We don't have anything like that here. The cars have it but nobody checks it. They thought about it but Politicians and votes are a sensitive issue.

 

Glad I started a robust discussion around all this. Unfortunately, I got lost after the 1st page of replies (way over my head) and probably won't touch or do anything about clean these things.

 

Wise move. The spray thru a vacuum hose is the easiest way of keeping a GDI engine clean inside. Subaru sell a good cleaner so it's obvious they have problems with the cylinders laying on their sides.