ZJ_HR
Gold Member
People were usually blocking EGR valve on VW TDI or SDI engines here, by putting copper washer instead of gasket, as it caused problems with sulphorous fuel. This appeared 5-6 years ago, especially on gentle driven cars.
Carbonized diesel intake manifold
- Thread starter Rch
- Start date
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Sure guys, and we can dump our used motor oil in the front yard too..... /forums/images/graemlins/wink.gif
If you drive the vehicle and dont let it idle for extended periods(more than 2-3min) you'll have less troubles. They're having the same troubles with the 6.0L Fords, I would immagine anything with an EGR. On the ones that have to idle (rescue, tow trucks, etc) they must be equiped with an idle kicker to help build heat in the engine. Dont fall into the "truckers do it" mentality, these are passenger vehicles and have different systems on them to allow it.
The soloution is a good fuel additive and keep it hot, diesels are self cooling at low RPMs. At least until you can get ULSD. Things will get better soon.
If you drive the vehicle and dont let it idle for extended periods(more than 2-3min) you'll have less troubles. They're having the same troubles with the 6.0L Fords, I would immagine anything with an EGR. On the ones that have to idle (rescue, tow trucks, etc) they must be equiped with an idle kicker to help build heat in the engine. Dont fall into the "truckers do it" mentality, these are passenger vehicles and have different systems on them to allow it.
The soloution is a good fuel additive and keep it hot, diesels are self cooling at low RPMs. At least until you can get ULSD. Things will get better soon.
SkyPup
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Part of the problem, in additon to the low quality diesel fuel with high sulfur, is her short trips not allowing warm-up of the crankcase fully each day. The PCV valve actually has an electrical heater to help keep the water vapor from freezing up or clogging the PCV intake.
Remove the PCV valve hose from the intake tract after the MAF sensor and plug the hole in the manifold and allow it to drip into a small container.
Like another mentioned, your intercooler probably is gunked up too from all the PCV related crud.
Also, a high quality full synthetic Group IV motor oil like Amsoil's or Chevron's or Exxon's top of the line has very low NOACK volatility, thereby decreasing the amount of oil vaporized in the crankcase and sucked into the PCV. For instance, dino Shell Rotella 15W-40 has >13% volatility, while Amsoil is ~ 5%.....
Our two eight year old TDIs have never had this problem in > 380,000 miles since we disconnected the PCV when new, use BP Supreme Diesel fuel, and normal drive to work is about 15 miles @ 65 mph one way each day.
Remove the PCV valve hose from the intake tract after the MAF sensor and plug the hole in the manifold and allow it to drip into a small container.
Like another mentioned, your intercooler probably is gunked up too from all the PCV related crud.
Also, a high quality full synthetic Group IV motor oil like Amsoil's or Chevron's or Exxon's top of the line has very low NOACK volatility, thereby decreasing the amount of oil vaporized in the crankcase and sucked into the PCV. For instance, dino Shell Rotella 15W-40 has >13% volatility, while Amsoil is ~ 5%.....
Our two eight year old TDIs have never had this problem in > 380,000 miles since we disconnected the PCV when new, use BP Supreme Diesel fuel, and normal drive to work is about 15 miles @ 65 mph one way each day.
OP
Rch
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cup149, I'm aware of Fred's TDI Page, http://www.tdiclub.com/ . Are there any other good TDI/VW forums ? I recall a Canadien guy who had an excellent site but have lost the link with computer crashes, switch to Fedora/ Linux etc. Any info is appreciated. /forums/images/graemlins/tongue.gif
cup149
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OK, this is one that I know "a little bit about". There are many misconceptions about why the manifold and EGR valve plug up. It has NOTHING to do with the fuel!!! The ONLY reason there is an issue with carbon build up is because oily vapors ( crankcase ventilation), are mixed with recirculated exhaust gas (EGR). That is it- nothing more. Eliminate one or the other and you're problem is solved. The easiest way to do this on the VW TDI engine is to shut down the EGR system electronically, through the ECM. Unless the car is new, the intake and EGR valve still need to be cleaned for like new performance. Anything else you may read or try just doesn't cure the root cause of this problem. Yes, the car will still pass an emmissions test- don't ask me how I know, after all, this is the Internet, the source of more mis- information that all others combined....
SkyPup
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The only reason exhaust carbon builds up is because sulfur atoms are the center atom of the carbonaceous buildup. Once you get rid of the sulfur in the fuel, as in ULSD, you will no longer experience this problem to begin with.
Care to explain why they dont have this issue in Europe....You need to understand the cooling characteristics of the EGR system and what it does to the fuel and yes PCV that is being burnt. It is all related, I'm not discounting that if you disconnect the EGR you wont notice the problem, just stating that it is designed to be there for emission purposes and if you drive it correctly with good fuel you wont have these issues.
