150tdi. No power til 2500+rpm Update 7th May

if poss get the car running and check for leaks from the intercooler and pipes, it will sound odd where its leaking.

the other thing how do the vac pipes look? the ones on the bulk head, theres also one that goes down the back to the actuator. check these as they go soft and holed. replace them should only costs a couple of quid for the pipe from the local motor factors. (I evened up with reinforced fuel line, worked a treat)

 

Took it to the local VW specialist this morning. No signs of leaking boost etc.
But, when we took the rocker cover off it was apperent that the cam and followers have worn quite badly.
Would this have such an effect on the power? I know it's not good but he said it was the flatest PD he'd ever been in lol

 

any ideas if it is producing boost?

 

it might well have been run on the wrong oil then at some point as the pd is very picky, if its got the wrong oil the valve gear and the unit injector tops wear badly.

maybe worth thinking about a new cam and followers, also where are you? (cant remember if ive asked) as if you localish to me ill happly stick it on vagcom for you and log the boost and power made etc, may help things.

 

Mart's in Wales.

 

i had this problem for a little while was getting a code saying it was overboosting, sounds good, and was told the same sort of things you were told, however Matt had advised me to get some fuel additive... for diesal of course and sonce then mine has been problem free, no limp mode's nothing i have the same PD engine but the 130 BHP, try the additive, you never know was only a 10 and has been fine since

 

Righty.
Put a boost gauge onto the inlet manifold today(stupid bloody 1/4 BSF fitting!) and the readings were as follows:
Idle: 0 bar
4000rpm 1 bar

Nice gradual climb in boost pressure, so I'm assuming it's working ok then?

 

pd's are known for chewing cams, my bro's 150 has the exact same problem, only he waited until the cam was that bad it rendered his head usless too!! the nob

i would sort that and then come back here if it's the same!

 

New cam, followers, bearings etc being changed on wednesday. Fingers crossed it will solve my problem.
Car's looking mint, but goes as well as a shagged out lada!

Quite a p155 poor design though, 140k and it needs a new cam, where my old '85 mk2 with 240k never missed a beat.
VW should have had a recall and put in the redesigned tappets free of charge to stop the cam wear.

 

Well, today the cam was changed, the lifters and cam bearings. Total cost approx. 900 inclusive parts and labour, but don't go there. Cheaper than VW at a cost of 1200!!!

The cam was in a right state, the lobes didn't match due to excessive wear, and I mean excessive! I'll get some pics up tomorrow. 1 lobe was 3mm smaller than the opposite matching lobe!!
1 of the fuel injector lobes had a groove worn into it that it looked like there was a cunk missing!!
The lifters wree also fooked. 3 of them were really bad, in that the centres were nearly 2mm shallow in the centre. I htink another 1k miles, and it would have finally given up.

The bearings, well, also buggered. Work on one side only on all of them.

But.......................

The car is still running the same but alot quieter.

HAving looked at the Vagcom, ther MAF MAP and N75 are all working, and the boost is really apparent, but with no black smoke at all out the rear.

Having talked to another specialist, it looks like the fuel distribution pump on the end of the head could be at fault, and due to it being mechanicial, it's won't show up an error on Vagcom.
I have one coming so Ill keep you updated unless there are any other suggestions

 

blimey its not a easy fix so far

 

what a ba$tard of a car

 

If you think this is bad, you should see my mate's Audi Allroad 2.5 diesel. The cam lobe wear on those engines is just absolutely shocking. And they all do it from a relatively early mileage, even when always properly serviced.

 

What pi55es me off is that it's blatantly obvious that most of the parts have already been either off or changed before I bought the car, due to the p155 poor job they had done.
Stripped threads in the head, rounded bolt heads, missing parts etc.

 

Changed the tandem pump on the endof the head today.
Still no joy.

There's no black shi t coming from the exhaust so it's either a fueling problem of the exhaust could be blocked. It's boosting like fook, but it ain't going anywhere lol

 

might sound daft, whats the state of the fuel pump llike??
the tandam pump is only the high pressure side, the lifter pump still has to deliver the go go juice

all i can recall of top of head is bolt in side of head pressure should be 3-3.5 bar

had a 3 cylinder tdi with poor idle last week- low on power, ended up the intank fuel pump poor

 

Had a quick read through this thread and symptoms sounds like an EGR valve fault we get on Transits when the actuator gets stuck, however, when you strip the EGR it is stuck, and you get a P0404 DTC to prove it, with no error codes it is a guessing game.

Mart, unbolt the downpipe/cat or whatever and drive it, exhaust could be blocked as mentioned earlier in the thread. It'd be like trying to phart through a straw!

Seraph, if the local specialists can't sort it, it's well worth Mart trying a few of the suggestions from this thread.. as long as they're not toooo expensive...

 

hi there Gary, yeah, exhaust will be coming off in a few days, exacatly what you said, just drive it without the cat on and annoy the neighbours for 10 mins lol.
The EGR is totally clean and moves fine, but will have to check it's getting the right vacuum to it, it can be checked using the measuring blocks in VAGCOM so will have a look at that. Also need to check the alignment of the injectors and their settings from TDC.
I'll have to get some pics today of the old cam and tappets. Bloody frightening!