Coolant Loss on Passat Pd130

[Fat Audi 80]

Do a boost leak test. If no leak found then look for black smoke. You should have a slight haze of smoke at full throttle. If not then its possible pd 100/115 injectors are fitted not the 130/150 units. They would cause a reduction in power and less smoke.

Thanks, but I don't think so, my injectors have been refurbed, I believe the mechanic said they still had the writing on them number the cylinders when he had them back.

I am suspecting something like the maf?

I think I might end up at MRC if I can't sort it...

[simon20vq]

My PD130 Passet ran like a drean never had any issues in 3 years then it got a whine on the gear box so I PX'ed it at a garage. I then went to a 530d e60 and 3 years down the road the turbo went, did it myself but still about 800 quid bill. So as I travel less I thought I would get an old s2, best thing I've done. Easy to work on cheap(is) to fix 25-30mpg and petrol is 1.29 whereas diesel is 1.39. Newer car's just getting more complicated.
Anyway hope you have many trouble free miles and it snow's in your area so you can use your board!

[djh]

Bring back the old 1990s vag diesels I say

The 1z engines are the best, reliable and go on forever.

I am seriously getting put off these modern high compression high pressure diesels. They are too highly stressed and some of the components are astronomically expensive to replace....

We don't even do that many miles now to justify diesel....

My car had issue's with the injectors and the wiring loom (passat pd engine think it was the 115bhp or 110bhp model) this was all changed for new injectors/loom but never felt right, headgasget went shortly afterwards, wished i'd have got a old 1z audi now.

[diesel des]

Use vag com to look at maf requested and actual. I forget the block no. Go for a drive. In say 4th gear at low rpm go to full throttle. Get a friend to watch actual and requested maf. The actual will bounce arround a bit, but should be roughly the same or greater than requested. If its less then the ecu reduces fuel to stop smoke, so less power. Check the maf.

Repeat same tests with requested and actual boost. You should peak at about 2300mb or 1.3 bar boost. Again a differece could be boost leak or stuck vnt.

While you might of got the same injector bodies back the nozzles meter the fuel and are smaller on the 100/115 pd.

[s2driveruk]

Well this sage has almost come to an end.

Believe it or not the garage have had the car for over 6 weeks. The guy that took the head off it was later sacked so once the head was finally back from pressure testing and refurb they could not get the car running. Because the mechanic putting it back together had not taken it apart he suspected operator error for the lack of boost. After another couple of weeks of specialists looking at the car and confirming it was back togther correctly and timed right etc, the injectors were finally diagnosed as faulty and send off for testing.

The injectors were condemned due to heat damage and had to be refurbished. With refurbed injectors and a rebuilt head the car is running properly again. (Or almost)....

It has cost me £2758 just for the above, £1100 of it being 4 refurbed injectors, but I still don't think the car is completely right. (They only charged me 10 hours labout despite throwing over 50 hours into it trying to sort it out)....

It seems to need slightly too much throttle to accelerate and does not quite have the oooomph it had before. I don't know if I am expecting too much having not had it for a while or whether the head needs to bed in the and ECU adjust to the new injectors, but my butt dyno is not convinced.

I am going to give it a few more miles and monitor the fuel consumption to see if it improves. (Only done 50 miles so far).

I am pleased to have it back but gutted by the bill.

Any words of wisdom?

Cheers,

Steve

Hate to say it Steve but what you just described above was the same for our old A6...we ended up part ex for the Scout as I was never 100% convinced it was running perfectly even after a similar spend (injector refurb was less, if i had been on a bit i might have been able to point you to a company who have the right bosch kit to refurb the PD injectors)

It turned me away from diesels for good actually...having said that the scout was recovered a week ago with suspected coilpack problem, now looking at bore/ring problem and potentially a new engine under warranty. Not bad for 12k miles - I'm seriously wondering what has happened to VAG quality

[Fat Audi 80]

Thanks David, I am trying to forget about the whole sorry saga. I still love the car for some reason, but it is returning a tank average currently of 35mpg whilst not being driven hard. I am going to take it back to the garage and ask them to put it on the computer to look for codes. Prior to finally replacing the injectors to cure the poor running it had the whole engine operation and fault codes etc checked over. I can't help feeling there is a small air leak or a maf problem. The drive by wire throttle does nothing for 5 -10 mm of travel then the car picks up and goes really well. But on cruise control it is noticeably 10mpg down on the instantanous readout from what I can remember....

[s2driveruk]

check the injectors again for fueling - i bet they are running really rich, on mine they couldnt get it right. Feel for you, its ***** when you have spent that much money and time and its not singing. Ours felt like it was bogging down when trying to pull away, really sluggish, then suddently pick up about about 1500rpm

[Fat Audi 80]

Is there set up for the injectors? Can the fuel supply be adjusted. I think the car is going to have to go back to the garage...

Cheers,

Steve

[Tony Stark]

I dont know about injection quantity adjustment or whatever you call it but there is a setup for when injectors are being fitted to the cylinder head, plunger travel and nozzle angle - Just incase its been overlooked.
Hth

[Fat Audi 80]

Thanks...

[Fat Audi 80]

Another update:

Just to try and put this one to bed. The car is running well and pulls nicely with no noticeable smoke at all, it feels strong.

BUT, the fuel consumption still does not seem right. The best I have seen so far is 45mpg on an A-Road / Motorway run. Short journeys and around town it is more like 32 - 35mpg.

In the past, I know the best I have seen grannying it was 60mpg. 50mpg could be achieved comfortably, by driving sensibly. You coud not get it below 40 unless you were going mad or on a very short run.

The car throws no fault codes, does not smoke and feels fine, it is just the MPG which seems down by about to 10mpg in all driving scenarios.

I am tempted to try and clean the MAF, is this a valid course of action?

What else can I check that will not be throwing any codes????

Thanks,

Steve

[simon20vq]

My Bmw did something similar turned out to be the O2 sensor.

[Fat Audi 80]

Thanks, slowly getting fed up with the thing. It is great WHEN it works....

My '80 2.0 8v Sport has not missed a beat, just change the oil and filters and thrash it.

They don't build them like they used too.

[benntenn67]

Modern cars

Thanks, slowly getting fed up with the thing. It is great WHEN it works.... :

They don't build them like they used too.

You're welcome to join me in the mk2 passat (32b) club

[Fat Audi 80]

Posted for future reference

Best Answer - Chosen by Voters

Your passat tdi 130 should do 50 mpg on the motor way there are a number of possible causes for poor mpg.

1) Open the oil filler cap after a journey, If you smell Diesel you will need the unit injectors replaced as these seals fail and leak into the engine oil. If this is left too long serious engine damage can occur.

2) Dirty or clogged diesel filters will also cause poor running and poor mpg as the access diesel.

3) Dirty or clogged Air filter.

4) Wrong tyre pressures creating greater rolling resistance, try 32psi front 30 psi rear.

5) clogged egr valve or sticking waste gate (caused by build up of carbon deposits, Can be cleaned with a good intake cleaner.

I own two vw cars with the tdi 130 pd engine one is a passat 2003 and the other a Golf estate tdi 130 pd these are used a curtasy cars and achieve at least 35mpg local and 50/60 mpg on motor way journeys. I regularly use Shell V power Diesel which cleans all the Gum deposits off the valves etc and gives a better throttle response.

Source(s):

Mechanic / Vw specialist