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Old 07-31-2010, 04:14 AM
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Default LT35 2.8 tdi Engine Cuts Out

My 2004 VW LT35 MWB 2.8 tdi (158 bhp) van has developed a fault. The one and only symptom is that the engine periodically cuts out and completely dies. It did this about four times over a 500 mile motorway journey, usually under reasonably hard acceleration.

There are no warning lights showing and no apparent loss of performance. When the engine dies it starts up immediately again once the ignition has been turned off and back again. It will even do this without bringing the van to a stop. Again, once it's re-started it shows no sign of having any sort of problem.

Any thoughts about what the problem may be and how to resolve it?

Also, can anyone recommend an independent VW specialist, ideally in West or North Yorkshire who may be well-placed to diagnose and rectify this fault?

Thanks

Sam
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Old 08-03-2010, 02:50 PM
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Hi Sam

I've got a 55 reg that is dong exactly the same thing, have you had any joy in sorting yours, i have tried cleaning the earths, changed the battery, still no joy. Please let me know if you have sussed it, if not and I do find the fault I will let you know.

Cheers
Dave
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Old 08-05-2010, 10:36 AM
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Hello,

Just stumbled on this site whilst searching for the exact above problem. My LT 35 lwb 2.8 is at a diesel specialists right now having the cam and crank sensors replaced. they don't think it is fuel related. had 2 codes come up, 1. fuel pressure regulator (sporadic) and 2. MAF. Both codes clear ok and re-log next time it goes wrong.

Hi by the way

Bodge
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Old 08-14-2010, 04:09 AM
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I have a 05 plate LT35 158 bhp doing exactly the same as above faults, can be sitting at tick over and just dies sometimes, have had throttle sensor and crack sensors replaced, still the same, occasionally loses power but most of the time runs fine. Only warning light on is attemped to start with the wrong key according to the user manual. Does anyone know how to sort this ????

Cheers thestagesmith.
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Old 08-20-2010, 02:57 PM
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Quote:
Originally Posted by Sam LT35 View Post
My 2004 VW LT35 MWB 2.8 tdi (158 bhp) van has developed a fault. The one and only symptom is that the engine periodically cuts out and completely dies. It did this about four times over a 500 mile motorway journey, usually under reasonably hard acceleration.

There are no warning lights showing and no apparent loss of performance. When the engine dies it starts up immediately again once the ignition has been turned off and back again. It will even do this without bringing the van to a stop. Again, once it's re-started it shows no sign of having any sort of problem.

Any thoughts about what the problem may be and how to resolve it?

Also, can anyone recommend an independent VW specialist, ideally in West or North Yorkshire who may be well-placed to diagnose and rectify this fault?

Thanks

Sam
hi i have had the same problem for about a year now,it has been on the diagonostic machine but the fault cannot be found.two weeks ago it cut out as i was overtaking a car on the motorway,i turned the ignition off then on as you have to to restart it,then the turbo blew,loads of blue smoke,just had a new turbo fitted £900,i still have the same problem vw dealer recons no one else has ever reported this fault.it is now doing my head in i am desparate for a solution can someone please help thanks
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Old 08-20-2010, 03:52 PM
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Quote:
Originally Posted by Bodge View Post
Hello,

Just stumbled on this site whilst searching for the exact above problem. My LT 35 lwb 2.8 is at a diesel specialists right now having the cam and crank sensors replaced. they don't think it is fuel related. had 2 codes come up, 1. fuel pressure regulator (sporadic) and 2. MAF. Both codes clear ok and re-log next time it goes wrong.

Hi by the way

Bodge
hi i also have the same problem it has also been mentioned to me that the sensors may be at fault if you manage to sort this will you please let me know thanks keith
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Old 09-11-2010, 06:48 AM
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Quote:
Originally Posted by keith effard View Post
hi i also have the same problem it has also been mentioned to me that the sensors may be at fault if you manage to sort this will you please let me know thanks keith
A quick update. I had the crank and cam sensors sorted and the van ran great until the other day the same problem, it just cut out and restarted, after crossing 2 lanes of the motorway to the hard shoulder. I then continued the rest of my journey (130 miles) with a couple more cut outs.
The sensors were replaced a few weeks ago and the van completed 730 miles before the problem resurfaced.
I took it to the diesel specialist again and they hooked it up to the fault reader.
It said fuel injector pressure problem. the guy connected the feedback pipes to some bottles to measure how much fuel was being returned to the tank by each injector. injector number 1 was streaming out whilst the others were just dripping (which is correct I believe). I have just collected the van/money pit after the injector has been replaced and I am now left to test the van over the next few days/hundred miles. My spend for this problem is now at around £800 so hope the injector has sorted it.

My power steering pump has been shot for the last 12 months and am after a reconditioned one if anyone has any ideas.

It feels like I am just working to pay to keep the van on the road

I'll post back how I get on.

Bodge
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Old 09-11-2010, 07:02 AM
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Just to add to my last post, I have had a long chat with my mechanic and it would appear that the cutting out of the engine may be for many reasons. ie if any of the sensors detect a slight problem they will trigger the fail safe and shut the engine down. He also suggested that the box of tricks behind all of this (ecu?) is not as clever as VW would have you believe and can not really multi task and only looks at one system at a time and can often mis diagnose problem and even throw red herrings into the pot. I really don't want to throw any more cash at this vehicle but what are the options? a new van? a second hand van? jeez
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Old 09-11-2010, 03:32 PM
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Default van still cutting out

hi ,really pleased someone has got back with some more info it seems this is quite a common fault for van owners,but the vw dealers i have approached have never came across it.mine is going back on monday for more tests,but like you said if they do not know what the problem is how much is it going to cost before a solution is found.i cannot fault my van with 115000 miles on it,untill this fault comes on.i will be back in touch if i get any further.
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Old 09-13-2010, 12:08 PM
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hi my van is in to-day,they recon its a problem with the regulator valve on the fuel pump.unfortunatley vw do not do the valves separate,so they are removing the pump to get a part number,they recon they can get a replacement valve elsewhere. i will of course let you know how i get on when the van returns,,cheers keith.
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Old 10-03-2011, 05:34 AM
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Post LT35 fault up-date

Hi everyone,

Thanks for your responses. It doesn't sound like any of you have managed to get to the bottom of this problem. It's possible that we may be talking about us all having different problems, which just happen to have the same symptoms. PLEASE REPORT BACK IF YOU'VE MADE ANY PROGRESS.

Having lived with the cutting-out fault for some time now, I feel like I better understand the problem. As I'm off on a big Scotland trip in the next couple of weeks, I was considering taking it to a main VW commercial dealer to give them a chance at fixing the problem. Here's my latest take.

THE HISTORY
- When the fault originally occurred the ECU was checked for faults. It returned 7 faults:-
o 449B Intake manifold pressure sensor faulty;
o 449D Intake manifold pressure sensor faulty;
o 4154 Camshaft position sensor faulty;
o 4677 Accelerator pedal faulty;
o 4678 Pedal Ė travel sensor/power supply;
o 425D Control unit digit/component faulty;
o 4441 Rail pressure monitoring fault.

- The ECU didnít log dates with the faults, or any sort of order, so it was unclear which had been triggered most recently.

- The error codes were deleted off the ECU. The ECU was re-checked next time the fault occurred, hoping that it would return a single error code pointing to the specific problem. Unfortunately no error codes had been logged. This was around 6 months ago. The ECU has not been checked since.

THE SYMPTOMS

- The engine cuts out without warning. Thereís no loss of power, no coughing and spluttering. It just stops dead Ė like the ignition has been turned off.

- There are no relevant warning lights lit.

- If the ignition is turned completely off, then back on again, the engine (apart from on one occasion where it took a few goes) restarts and continues to operate without any apparent loss of power. This re-starting can be done without stopping the van if needs be.

- The cutting-out often repeats itself two or three times in relatively quick succession over a 5 or 10 minute period, but can then not recur for hundreds of miles.

- The engine tends to run slightly hotter than normal immediately before and after the engine cuts out. The temperature gauge increases by around one increment.

RECENT SYMPTOMS
The following are symptoms which have developed more recently. The instances of cutting-out occurred before these symptoms developed, but itís possible they may be related in some way:-

- A loud, low hum is intermittently emitted from the engine. It usually occurs if you accelerate than lift off the throttle to half-throttle in the same gear. The noise disappears if you completely lift off or apply more throttle.

- The van sometimes makes this same noise at start-up, when you turn the key half-way, to let the solenoid work. Once you turn the ignition fully on, the noise goes away.

- Most recently the engine has developed a noise which sounds like air leaking under high pressure. I think it coincides with the turbo operating.

CONDITIONS WHEN THE FAULT OCCURS
- The cutting-out tends to occur in 3rd, 4th or 5th gear. Never in 1st or 2nd.

- Itís usually when the van is going up-hill so the engine is having to work harder to maintain speed. It doesnít have to be a particularly steep hill;

- It tends to be when you accelerate in 3rd or 4th up a hill then change to a higher gear causing the revs to drop and the engine to labour. Itís then that the cutting out usually happens.

- It always tends to occur when the engine is up to temperature, usually when itís been driven for at least an hour or so. Never when itís cold.

WHAT OTHERS HAVE TRIED
From your posts, it seems the following fixes have all been tried unsuccessfully:-

- Cleaned the earths and changed the battery;
- Replaced cam and crank sensors;
- Replaced throttle sensor and crank sensors;
- Replaced turbo;
- Injector replaced;
- Replaced regulator valve on the fuel pump.

PLEASE REPORT BACK IF YOU'VE MADE ANY PROGRESS.
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Old 10-03-2011, 09:02 AM
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Default Injectors

Quote:
Originally Posted by Bodge View Post
A quick update. I had the crank and cam sensors sorted and the van ran great until the other day the same problem, it just cut out and restarted, after crossing 2 lanes of the motorway to the hard shoulder. I then continued the rest of my journey (130 miles) with a couple more cut outs.
The sensors were replaced a few weeks ago and the van completed 730 miles before the problem resurfaced.
I took it to the diesel specialist again and they hooked it up to the fault reader.
It said fuel injector pressure problem. the guy connected the feedback pipes to some bottles to measure how much fuel was being returned to the tank by each injector. injector number 1 was streaming out whilst the others were just dripping (which is correct I believe). I have just collected the van/money pit after the injector has been replaced and I am now left to test the van over the next few days/hundred miles. My spend for this problem is now at around £800 so hope the injector has sorted it.

My power steering pump has been shot for the last 12 months and am after a reconditioned one if anyone has any ideas.

It feels like I am just working to pay to keep the van on the road

I'll post back how I get on.

Bodge
Just spoken to my local VW commercial maindealer in Cleckheaton near Bradford. They reckon they've seen the fault before (They hadn't last time I spoke to them). They reckon 9 times out of 10 (quote) it's the injector modules. It would cost £1,250+VAT to replace all 4 and they can offer no guarantee that it would definately remedy the problem.

BODGE - I'm therefore very interested to know whether your replacing the injectors proved to be successful? Please let me know.

Sam
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Old 12-12-2011, 03:22 PM
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Quote:
Originally Posted by Sam LT35 View Post
Just spoken to my local VW commercial maindealer in Cleckheaton near Bradford. They reckon they've seen the fault before (They hadn't last time I spoke to them). They reckon 9 times out of 10 (quote) it's the injector modules. It would cost £1,250+VAT to replace all 4 and they can offer no guarantee that it would definately remedy the problem.

BODGE - I'm therefore very interested to know whether your replacing the injectors proved to be successful? Please let me know.

Sam
How are you getting on with things?
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Old 12-14-2011, 02:29 AM
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Default LT35 Fault Resolved......

Hi all,

I write with good news. I found a fantastic diesel specialist called Power Line in Shipley (Welcome to Powerline) near Bradford, West Yorkshire who have helped massively to diagnose the fault.

As it happens, the main VW dealer turned out to be right. The difference was that the VW dealer in Cleckheaton had no means of testing the injectors. They were going to have me pay for replacing all four injector modules, at huge expense, in the hope that it would solve the problem. I was extremely annoyed that they didn't tell me that a diesel specialist would be able to investigate the problem properly. I had a bit of a go at them as you'd expect more from a main dealer.

Not only can Power Line test the modules, thereby identifying whether there is actually a fault with any of them, their ability to test them means you only have to replace the faulty one, not all of them speculatively. They therefore tackled the problem with increased confidence and reduced cost. Fantastic.

Unfortunately they also found various other (unrelated) things wrong with the van including a faulty solinoid and cracked turbo intercooler, so the final bill was quite large but I'm just delighted the van seems to be cured.

My only caveat is that I haven't driven it a huge amount since it was fixed, and the fault used to manifest itself on long drives. But it's been to Sheffield and back, fully loaded, without any problems, so I'm very confident in what they've done. I will of course report back if I experience any other issues.

Good luck.

Sam
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Old 07-05-2012, 05:12 PM
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Quote:
Originally Posted by Sam LT35 View Post
Hi all,

I write with good news. I found a fantastic diesel specialist called Power Line in Shipley (Welcome to Powerline) near Bradford, West Yorkshire who have helped massively to diagnose the fault.

As it happens, the main VW dealer turned out to be right. The difference was that the VW dealer in Cleckheaton had no means of testing the injectors. They were going to have me pay for replacing all four injector modules, at huge expense, in the hope that it would solve the problem. I was extremely annoyed that they didn't tell me that a diesel specialist would be able to investigate the problem properly. I had a bit of a go at them as you'd expect more from a main dealer.

Not only can Power Line test the modules, thereby identifying whether there is actually a fault with any of them, their ability to test them means you only have to replace the faulty one, not all of them speculatively. They therefore tackled the problem with increased confidence and reduced cost. Fantastic.

Unfortunately they also found various other (unrelated) things wrong with the van including a faulty solinoid and cracked turbo intercooler, so the final bill was quite large but I'm just delighted the van seems to be cured.

My only caveat is that I haven't driven it a huge amount since it was fixed, and the fault used to manifest itself on long drives. But it's been to Sheffield and back, fully loaded, without any problems, so I'm very confident in what they've done. I will of course report back if I experience any other issues.

Good luck.

Sam

Update Sam??
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