Hi i have a vw t4 1.9td, it had developed air in the fuel line when left overnight, it starts fine then starts losing power before eventually stalling after about 10 mins, it then struggles to start but eventually ndoes then is fine til it ti is left again, as the fuel lines are clear it is visable that air in the lines is the problem but i have no idea how it is getting in?
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Close the filter drain cock, remove the filter, fill the filter with fuel and put it back on. Now crank the engine to start at a faster speed and let it blubber till it smooths out and your good. If you\'ve been cranking on it already, hope not, then you have allowed air into your fuel system and you must bleed all the air out at the injector lines until there is fuel coming out of each line you\'ve got cracked open at each injector. It will take some time and a lot of cranking. But if you do it like I said to start with, it will start easily. I\'m an old timer and love diesel engines. Old school way is the only way.
There are devices in the Bosch CIS-E system not functioning that may need replaced. Most commonly it would be the thermo-time switch. This switch is also a sensor telling the ECU whether your engine is cold or hot so it would compensate fuel delivery depending on temperature. An auxiliary air regulator also opens (more air) or closes (less air) dependent from the thermo-time switch signals. It's basically telling the ECU when it's a cold morning to supply a richer air/fuel mixture or not to when it's at operating temperature. There is also a cold start valve (fifth fuel injector) that could be sticking or leaking or simply not supplying fuel during cold start up. Again, this has a higher level of understanding and special VW tools to diagnose your fuel injection problem that should be left to a VW tech to work on. It could be dangerous because fuel is involved, a single spark from static electricity could ruin your day.
It sounds to me like it's going into "limp mode" - Google it! It's a kind of "get-you-home" setting when there's something wrong. You will need to get the fault codes read (or do it yourself with VAG-com software on a laptop) and then take it from there. It needn't be an expensive problem - maybe a split air hose in the turbo system - or it might be a dirty MAF or stuck vanes in the turbo itself, or any combination of 1300 other things. Main thing is - don't go replacing things willy nilly! Get the fault codes (aka DTC's) read first. An interface cable costs about £15 and the VAG-com software can be downloaded for free.
Hope this helps you a bit. If it does, a "Fixya" rating would be much appreciated. If it doesn't help you, I'd be grateful if you didn't bother with a rating at present - they can't be increased later if I do manage to solve your problem! Just come back and tell me what you found.
93 Golf, 96 Passat, 97 Sharan