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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old October 23rd, 2018, 14:59   #16
horn
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Or you can get just 1 plate and replace the EGR Valve/ASV with a "race pipe".

You can also just remove the vac line that goes EGR Valve and block off the line....
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Old October 23rd, 2018, 17:54   #17
[486]
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Quote:
Originally Posted by horn View Post
Or you can get just 1 plate and replace the EGR Valve/ASV with a "race pipe".
or you can just leave the egr valve unhooked, it seals itself just fine
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Old October 24th, 2018, 07:47   #18
mt_mapper
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So, I've ordered the Mark Malone Stage 1 tune with Dynamic EGR and they are renting me the computer to flash the ECU. I may pick up an CCV vapor canister of some sort too. It seems to me that would probably take care of my intake clogging issues while allowing the EGR and exhaust coolant heater to still function when it's cold out.

Would unhooking the EGR throw a CEL? I thought about that. Would you want to plug that unhooked vacuum hose?
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Old October 24th, 2018, 08:16   #19
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Yes, it will throw a code (the ECU will notice that the MAF value does not change when the EGR is commanded open) and you do want to plug the line.
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Old October 29th, 2018, 20:32   #20
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Applied the stage 1 tune today. So sweet! I bet this is how the engine was supposed to run! I'm wondering if this is similar to how the Euro models were tuned?

Anyway, very worth while I'm thinking!
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Old October 30th, 2018, 09:47   #21
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Quote:
Originally Posted by mt_mapper View Post
Applied the stage 1 tune today. So sweet! I bet this is how the engine was supposed to run! I'm wondering if this is similar to how the Euro models were tuned?

Anyway, very worth while I'm thinking!
The Euro models have the larger nozzles I believe. Although I agree, a basic tune makes a big drivability improvement.
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Old October 30th, 2018, 11:00   #22
BobnOH
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Quote:
Originally Posted by mt_mapper View Post
Applied the stage 1 tune today. So sweet! I bet this is how the engine was supposed to run! I'm wondering if this is similar to how the Euro models were tuned?

Anyway, very worth while I'm thinking!
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Originally Posted by ToxicDoc View Post
The Euro models have the larger nozzles I believe. Although I agree, a basic tune makes a big drivability improvement.
I too was pleasantly surprised when I put the RC-2 on my stock 99.5, mainly to fix hard hot starting. It felt like 30% more power, by the numbers it was more like 15-20%.
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Old October 30th, 2018, 23:54   #23
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Originally Posted by jettawreck View Post
There is a good chance that since you did the initial intake manifold cleaning that ULSD became mandated and the intake didn't get very gunked up again.
tbh...VERY tired of reading this. It simply isn't true.
I admit, I wasn't around in the pre-ULSD days, but whatever diesel is available nowadays, still most definitely causes carbon build up in the intake. Absolutely zero question about it.
Fuel was switched over to ULSD in 2006? Then why are cars made after 2006 having mega CBU issues?
Look at BMW 335d (made from 2009-2011). Check out the DIYs on those forums - those guys usually do intake cleanings every 30k from the little bit of reading I've done.
Additionally, I cleaned out the EGR valve and intake on my ALH. I removed the EGR 800 miles later and it was just as caked as before I had cleaned it.

Even the newest diesels have soot in the exhaust. It's a HUGE battle with diesel engines. Additionally, EGR is used more than ever. Following that logic, soot is going to get into the intake track, and cause build up.


But yes: the way to eliminate it altogether is to do what you did - tune the EGR out and use a block off plate. The only reason I haven't committed is I'm worried how much longer warm-ups would take during the winter without EGR

Last edited by 2000alhVW; October 30th, 2018 at 23:57.
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Old October 31st, 2018, 09:54   #24
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Not a lot. But it will definitely fail you on an emissions check -- if you tune that out beware a physical inspection and make sure whatever you do is NOT a visible modification.
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Old November 1st, 2018, 11:06   #25
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Quote:
Originally Posted by 2000alhVW View Post
The only reason I haven't committed is I'm worried how much longer warm-ups would take during the winter without EGR
I decided to go with the CCV catch can and Malone Dynamic EGR tune rather than block-off plate and EGR delete route. I live in Montana and we have a plenty long and cold winter so I want the faster warmup with the EGR.

ULSD has definitely not eliminated coking of the intake. Maybe it slowed it a bit but it still totally happens.
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Old November 1st, 2018, 11:08   #26
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Quote:
Originally Posted by Genesis View Post
Not a lot. But it will definitely fail you on an emissions check -- if you tune that out beware a physical inspection and make sure whatever you do is NOT a visible modification.
I live in Montana and we have no emissions check or inspection.
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Old November 1st, 2018, 17:28   #27
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I blocked my egr off last winter (we set a 167 day record of temps below freezing, and a lot of it was below -20c), and warmup times weren’t too noticeably longer over a functional egr. Then this summer I built a catch can for the ccv. Built it baffled, and media filled, so no smell (I have it open on my 1 ton, and it’s noticeable sometimes), and it’s worked as designed so far.
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Old November 13th, 2018, 15:47   #28
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So what is the best quickest way to clean out a hunker up intake? I read a post saying Napa do it for $20? I called 3 napas and they had no idea why anybody would say that
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Old November 13th, 2018, 18:06   #29
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Just cleaning the inlet side, a wire wheel on a die grinder works decent. I’ve also used a pressure washer before.
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Old November 13th, 2018, 18:54   #30
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fire is the only way

spent days scrubbing mine in gasoline and still some more chunks came out when I tried torching it afterwords
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