I have a 2008 vrs tdi. Its had an injector off according to the bloke that was working on it so was replaced, also replaced 3 heater plugs. Ever since they have been done the car had a really bad judder/shake when under boost. Has anyone had this problem before, its also still crap at starting when cold. 

Has anyone came across this problem?

Any help appreciated. Thanks.

Anyone??

Have you replaced the diesel filter yet?

That is getting done tonight. So hipefully that sorts it. Just a process of elimination, cheap options first.

Any update?

Yes. Still no luck 😡

 

Changed fuel filter, replaced injector and still has the judder under boost. And is ****e at starting from cold.

 

Its got me fuming. The thing will get fired soon.

My car starts fine but starts hesitating/cutting out a mile or two into a trip but clears itself after a minute or so.

 

I too replaced the filter without any appreciable change in symptoms, the tank feed was checked and cleaned, no significant foreign particulates and flow to filter is unobstructed.  No DTCs so am reluctant to start pulling wires/injectors at this stage.

 

Perhaps the tandem pump is worn, I see you get gasket kits but I'm not sure the internals are serviceable, anyone care to comment?

The car is very bad at starting from cold also when warm. Ive just had it out to put diesel in got to a juntion and the engine is rocking its **** off. I really am sick of it. When it on odle from cold start its smooth as. But soon as i drive it it judders/misfires and when upto heat the engine shaking like a ****ting dog.

I wonder how yours would run with the MAF disconnected.

Ive not tried but i will. I cant see it making any difference like. 😫🤯

When you turn the ignition on can you hear the lift pump in the diesel tank run for a couple of seconds?

Here's another angle, a holed intercooler.

 

A big faff to get to and expensive to replace but theoretically repairable for cheap.

 

 

Another possibility, split in flexible intake section post MAF.

 

https://www.youtube.com/watch?v=mRgsH99NSMw

Dodgy fuel lines.

 

https://www.youtube.com/watch?v=zD0T1_ptydY

The possibilities just keep coming...

 

https://www.youtube.com/watch?v=EGWNMTEKpd4

3 hours ago, MicMac said:

When you turn the ignition on can you hear the lift pump in the diesel tank run for a couple of seconds?

I will try this tomorrow, is that under rear seat?

Yes.

 

Given that your problems started after a mechanic worked on it, perhaps taking it back for rectification is the way forward.

Edited 19 December, 20205 yr by MicMac

I took it away from the mechanic. He had it 7 weeks and was ****ing me about so i just told him to i was coming to get car. He deffo wont be getting his hands on it again afyer i seen it had been thrown back together and he had snapped a rocker cover bolt. Rounded a injector off also. Proper boils my **** talking about it. 

If it's any help for your diagnosing, after setting off yesterday my car became a bucking bronco more than usual.  I cycled the ignition to activate the lift pump whilst still driving and immediately felt an improvement.  My next task, weather permitting, is to replace the section of rubber fuel hose pre filter, I have already replaced the filter and post filter rubber hose.

I think its a valve thats gona tbh. I camt find any other problems for the misfire and the car shaking its tits off while driving.

Why do you think that?

 

A worn camshaft from using incorrect engine oil would give similar symptoms but would take time to develop.

 

Given the car's recent history I'm tempted to suggest reassembly error warranting immediate professional investigation before any/further damage is caused.

Just been speaking to a guy on fb he is having exact same problems with his. He has had compression check done and no compression from number 1. I think i will get thos compression checked and go from there, its really just ploughing money into it all the time.

 

Its always had the right oil in it as ive always got it from tps, the quantum stuff. 

 

I'm going to see the fella that was working on it and have it out with him tomorrow cos it didnt judder under boost before he got it but it did rock all over when idling

He might find Christmas dinner difficult to eat with busted teeth!

Will be having it through a feeding tube if ive got owt to do with it.

Brings back memories of an incident back in the day when 2 young lads chanced their luck with a cantankerous old scrap dealer and he proceeded to batter them with the very starter motor they were trying to steal.

 

Visions of all hell breaking loose in a cramped caravan office, fists and starter motor flying!

 

Ah the good old days... no I wasn't involved.

Edited 20 December, 20205 yr by MicMac