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Volkswagen TDI Models

2482 messages,  Last post on Dec 04, 2009 at 4:34 PM

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What is this discussion about? Volkswagen New Beetle, Volkswagen Golf, Volkswagen Jetta, Volkswagen Passat, Diesel, Hatchback, Sedan, Wagon

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#2382 of 2482 Re: water pump leak on 1992 1.9 diesel golf [shelley2] by pludlow Oct 08, 2007 (3:20 pm)
Replying to: shelley2 (Oct 08, 2007 2:17 am) The pump is located on the rear of the engine on the passenger side. If you know the leak is on the driver side and not running across a frame or sound barrier, then I am suspicious its not the pump. Having someone pressurize the cooling system should allow you to assess and locate the leak better. Pressurizers are a reasonable cost and a good tool for diagnosis. There are other cooling system components to the driver side of center that could be the source. The thermostat and coolant heaters are on the driver side of the engine above the bell housing, as well as the supply hose from the radiator.
#2383 of 2482 Re: fault code [sm3323] by church Oct 30, 2007 (7:33 am)
Replying to: sm3323 (Oct 14, 2006 8:23 am) I seem to be having the same code p0234 you talked about the N75 valve ?? what is it? where is it? how do i replace it? thanks Replies to this message: bpeebles (Oct 30, 2007 3:33 pm)
#2384 of 2482 Re: fault code [church] by bpeebles Oct 30, 2007 (3:33 pm)
Replying to: church (Oct 30, 2007 7:33 am) I assume you already know that P0234 = "Turbocharger Overboost Condition Control limit exceeded" So the N75 is a good candidate to look for problems. Since it is so expensive, you may wish to try cleaning it 1st.   To clean/test N75 - Disconnect 3 hoses from N75, mark each one so you know how they go back on. Be careful not to break the plastic nipples, then cut 1/4 inch off the end of each hose to eliminate possible holes or cracks in hose, if not new.   Connect 2 wires to battery POS and NEG, touch the connector on the N75 with the wires to cycle it ON. you'll hear it clicking. get electronic contact cleaner and spray in all nipples and cycle ON. black stuff will leak out. repeat process until liquid comes out clean. it should evaporate fast. then lube with electronic parts lube. reconnect hoses to N75, reconnect plug and you are done.   "what is it? " The N75 valve is simply the name given to the valve by VW. It is an electronically-conrolled air-valve which controls the signal to the VNT vanes of the turbocharger. The N75 is Pulse Width Modulated to control the vacuum signal coming out of the actuation port. Although TDIs do not have a wastgate on the turbocharger, some repair manuals refer to the the N75 as "Wastegate Bypass Regulator Valve".   Here is a technical description of N75 operation.   "where is it?" The n75 is located on the right side of the car just foreward of the fuel filter,on the inner fender.   "how do i replace it?" Remove the 3 hoses and the electrical connector and replace it. DO NOT MIX UP THE HOSES!!!   Here is a photo of N75 valve from my favorite TDI parts source.
#2385 of 2482 no fuel flow to injector pump by soapysails Dec 14, 2007 (4:09 pm)
I had the misfortune of running over a chunk of snow/ice ! it poke ed a small hole in my fuel line. I was able to cut out and replace a 4" section, however, it won't start. This is what I have done: a. bleed lines to eng. b. checked to be sure filter can is full of fuel c. checked fuel pump fuse. when we took the lines off, turned on the key, we were unable to get fuel up from tank.. am I missing anything ! BTW, I'm 100 miles from a dealer ! help boys ..   1998 vw TDI Replies to this message: pludlow (Dec 14, 2007 5:47 pm) bpeebles (Dec 14, 2007 6:04 pm) soapysails (Dec 14, 2007 8:52 pm)
#2386 of 2482 Re: no fuel flow to injector pump [soapysails] by pludlow Dec 14, 2007 (5:47 pm)
Replying to: soapysails (Dec 14, 2007 4:09 pm) Sounds like the hole was in the supply line and at one of your splice connections you have an air leak. Since the TDI is a suction pump as part of the injection pump (no electric push pump in the tank like the gas engine), any leak before the injection pump will suck air. If so you should see bubbles in the output leg of the fuel filter. You may need to fill the supply line between the filter and injection pump with fresh and absolutely clean fuel until the air in the line is gone, then reattach it to the filter. Also you could use a gravity feed from a clean jar just to get the engine running then reconnect the supply hose to the pump. Good luck - it's always the dreaded problem with diesels.
#2387 of 2482 Re: no fuel flow to injector pump [soapysails] by bpeebles Dec 14, 2007 (6:04 pm)
Replying to: soapysails (Dec 14, 2007 4:09 pm) To validate that the injection-pump and engine are OK... it is pretty simple to route the 2 hozes which normally go to the fuel-filter into a small container of CLEAN fuel. (put a soda bottle with CLEAN diesel in it under the hood near the fuel-filter) The engine should start and run just fine running from that container of fuel.   If that gets the engine going, then you likely have an air-leak in the system between the fuel-filter and the tank.   If engine does not run - your problem is between the fuel and the engine. (lets hope your injection-pump did not run dry and self-destruct) Replies to this message: soapysails (Dec 14, 2007 8:52 pm)
#2388 of 2482 Re: no fuel flow to injector pump [bpeebles] by soapysails Dec 14, 2007 (8:52 pm)
Replying to: bpeebles (Dec 14, 2007 6:04 pm) My thanks to "Pluglow and bpeebles" surprised to get such quick and helpful ans. I will try both ideas in the morning and let you both know.
#2389 of 2482 new beetle convertible TDI by blooeyes4u2 Dec 27, 2007 (2:54 pm)
Does anyone know if these are actually built? I've done LOTS of searching and haven't found anywhere on the web where this is an option. My next question is "why not?" Growing up in the 70's I owed several beetles throughout the years. A convertible beetle with a diesel engine is my 'dream' car that I would keep until they take my license ole blooeyes! Replies to this message: gagrice (Dec 27, 2007 8:32 pm)
#2390 of 2482 Re: new beetle convertible TDI [blooeyes4u2] by gagrice Dec 27, 2007 (8:32 pm)
Replying to: blooeyes4u2 (Dec 27, 2007 2:54 pm) That would be a great little car. Equipped with the DSG transmission and you have a winner. Buy a gas Beetle convertible and a regular Beetle with TDI. Then swap engines and transmissions. Sell the regular beetle with the gasser and you got your dream car.   Welcome to the Forum...
#2391 of 2482 Re: 2000 Jetta TDI - Intermittant starting problems [pruzink] by trujij Jan 23, 2008 (7:35 am)
Replying to: pruzink (Apr 04, 2007 7:04 am) Any chance you could answer a question on this subject? I have a 2002 VW Passat wagon. We lost the valet key and bought a new one from the dealer about 6 months ago. We found the old one a few days ago and stupidly tried to start the car w/it. Now even the original switchblade key won't work--nothing works. Anything I can do to get the new key we had made or the switchblade to start the car again? Thanks. Replies to this message: elias (Jan 23, 2008 12:31 pm) trujij (Jan 23, 2008 3:11 pm)

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