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Discussion Starter · #1 ·
Is this safe to do on the MKIV since it's drive-by-wire (DBW)?
It's no big deal on drive-by-cable cars, but is there a possibility that the servos and other parts of a DBW can be damaged if the throttle plate is moved, especially the way it's not supposed to? Also, are regular TB cleaners safe for the gaskets and seals (won't dry them out) in the DBW TB. I bought a can of Valvoline SynPower Carb Choke & Throttle Body Cleaner. On the can it says it's safe for cats and O2 sensors (not important since I'll be cleaning the TB with it out of the car), but it doesn't say anything about being safe for gaskets and seals.
I'm going to be giving this a shot soon and figured I'd try and get any advice I could before I started.
Thanks in advance.
 

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Discussion Starter · #4 ·
Re: Anyone ever clean the throttle body on their MKIV? (MTLVR6)

Thanks. Hopefully I'll be doing it in the next few days. I'll be putting together a DIY of how to do it (assuming I figure it out!
) I just wanted some tips before I started.
 

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Discussion Starter · #6 ·
Re: Anyone ever clean the throttle body on their MKIV? (anthony_g)

I saw that in the Bentley, but figured it was most likely reusable. The Bentley says that all gaskets should be replaced, but in reality many of them may still be in good enough condition to be reused.
Do you have the part # for the gasket? How much was it? If it's not too expensive maybe I'll pick one up just to be safe.
 

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Discussion Starter · #12 ·
Re: Anyone ever clean the throttle body on their MKIV? (tomvw)

Have you cleaned out a DBW TB? I know it's really easy to do on a DBC TB, but I'm worried about damaging the butterfly valve servos by moving it to clean it completely. Is this something I should be worried about?
I'm planning on removing the TB from the car and I've got a VAG-COM ready to do the adaptation once the TB is clean. I plan on reusing the gasket unless it appears to be in bad shape.



Modified by VgRt6 at 11:06 PM 11-7-2003
 

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Discussion Starter · #13 ·
Re: Anyone ever clean the throttle body on their MKIV? (Fantomasz)

Quote, originally posted by Fantomasz »
why U clean TB? any problems?

My idle is starting to get a little rough. It's not that bad, but is starting to annoy me nevertheless. I know the intake is full of oil from the PCV and it's never been cleaned in the 144k miles the car's been on the road, so it's probably a good idea to give it a good cleaning.
 

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Discussion Starter · #17 ·
Re: Anyone ever clean the throttle body on their MKIV? (tomvw)

Thanks for the replies guys. I'll probably get started after lunch. I'll let you know how it goes and also post the link for the DIY.
 

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Discussion Starter · #18 ·
Re: Anyone ever clean the throttle body on their MKIV? (VgRt6)

Well, I did the TB cleaning yesterday afternoon. Everything went well and the car is running great. The idle has smoothed out considerably. It's still not perfectly smooth (a slight jolt every few secs or so, nothing too serious though), but is much better than I remember it being for quite a while.
I took a bunch of pics during the process and should start working on a DIY today sometime. I'll post the link here when it's done.
Thanks for everyone's help.
 

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Discussion Starter · #20 ·
Re: (MTLVR6)

I may have spoken too soon about the improvements in the idle from the TB cleaning. The idle is definitely smoother than before, but the engine jolts/shaking is back again. It's not as bad as before the cleaning, but it's still enough to annoy me. I guess I'll have to start looking for others sources of the rough idle.
Regardless, I'm still glad that I cleaned the TB out and would recommend to anyone with a rough idle or even just a lot of miles on the engine to do the same.



Modified by VgRt6 at 10:21 PM 11-10-2003
 

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Discussion Starter · #22 ·
Re: (MastaVR6)

The only code I have is a perpetual cat efficiency code (16804).
The idle is the same after an hour on the highway as it is a few minutes after starting the car. The idle is actually rock solid at 680 according to VAG-COM. Granted the resolution of the VAG is only 40 RPMS, but it never fluctuates from 680 (meaning that the idle is constantly between 660 and 700). The car drives great. The only problem is a slight "jerk" in the engine at idle. It could be a number of things I guess, vac. leak, fuel delivery problem, worn motor mounts, a bad plug, etc. I don't think the problem is serious - it's more of a frustration. The idle used to be so incredibly smooth and now it's not anymore. Maybe I'm asking too much from a car with 144k miles where everything is original (except the stuff replaced during routine maintenances).
Cleaning the TB was a first attempt at solving the problem.
 

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Discussion Starter · #24 ·
Re: Anyone ever clean the throttle body on their MKIV? (4string)

Quote, originally posted by 4string »
I recommend that when you clean the TB, position it where the plastic cover end of the throttle body (the side with the electrical connector ) faces skyward.

This is exactly what I did. I know there are seals to help prevent contamination of the electronics, but I didn't want to take any chances.
Quote, originally posted by 4string »
VgRt6......I think there isn't anything wrong mechanically with your engine, it's something electrical.

I've been leaning towards this conclusion too. I think it's either a coilpack/wire/plug problem or a bad/loose ground somewhere. I also thought it might be a fuel delivery issue, but the engine is only like this at idle. At increased RPMs it's smooth as butter.


Modified by VgRt6 at 10:20 PM 11-10-2003
 

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Discussion Starter · #26 ·
Re: Anyone ever clean the throttle body on their MKIV? (4string)

I was planning on doing that a next step, but I have the flu and am stuck on the couch watching TV all day.
I'm going to try it tomorrow if I feel better.
 

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Discussion Starter · #27 ·
Re: Anyone ever clean the throttle body on their MKIV? (VgRt6)

The thing I don't understand is, if my problem was electrical, why would it only show up at idle? Wouldn't the problem also exist at higher RPMs too? Also, there are no misfire codes stored. The jerking kind of feels like a mini misfire. I had a cracked coilpack about 10k miles back (fixed with epoxy) so I know what a full misfire feels like. The jerking at idle is not nearly that bad, but is still enough make the engine move a good bit and shake the car a little.
I also think it might be time for a can of BG44K. The fuel system has only been treated once in the 144k miles it's been working and that was just one bottle of Techron fuel injector cleaner a while back. Maybe one of the injectors is partially clogged, causing a slight stutter.
 
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