2010 vw golf 77tdi injector problems

[asterixj91]

Hey,

just got the bad news from my mechanic...

about $3500 dollars for all 4 injectors and install.

was wondering, with all the problems that i've seen happened with other engine injectors failing. if something similar could have happened to mine?

the mechanic seems to think in this car's past someone has run petrol through the engine and stuffed the injectors.

And my big worry, the cost. are these injectors worth 600-800 dollars or can they be replaced under warranty by VW?

i'm the second owner, so i don't have high hopes for a warranty replacement but if i can lower the price somehow it'd make me happy

[Umai Naa!!]

Have it reassembled, and take it to the dealer to diagnose, and let them know you're seeking goodwill assistance.

[Ryeman]

.........and you weren't wanting to buy an engine, ONLY the injectors!

[harlie]

is the 1.6 77kw engine CR or PD?? mk5 golf was all PD (unit injector = pressure pump + injector in one), the 2.0tdi mk6 are all CR (separate cam belt driven pressure pump feeding all injectors - injector is just nozzle and solenoid/piezo).

I will question why all 4 need to be replaced. The horror stories relate to the PD unit injector in the mk5 125kw version. When one failed they were replacing all 4 because a revised version of the unit injector had been introduced. If you had issues with the 103kw like me, the replacement was exactly the same so I only replaced the failed injector and it never played up again. saying this the dealer wanted to do all 4, so I would be warry of the dealers too.

What did the car do - what are the symptoms?
What are the fault codes?
If the 1.6 is CR (sure it is) you don't even need to replace the harness - it is internal on the PD engines, and quite often the cause of issues.

If petrol has been run, than the high pressure pump should be stuffed before the injectors as it need the lubrication provided by the oily diesel.

As the second owner of a car that is out of warranty (like I was) - be very very surprised if they help with a 1.6 injector. When my mk5 PD injector was replaced it was $1000 for the part from the dealer here - can source them from the UK for under 300, so a CR injector should be cheaper.

[asterixj91]

i ended up getting 4 oem(as far as i'm aware) from cheaper diesels spares australia. and having the mechanic install them all. i'll have to get the full write up to check what he tested for to see how he got to the conclusion that it was only the injectors that needed replacing and not the pump i ended up getting the injectors for 1825 so 456 each which is better that the 800 i was getting quoted

[OilBurna]

Do you mind If I ask how much were the 4 OEM?


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[rory]

One injector on my 2010 1.6 TDI Jetta failed at about 175,000 k.
I was told by my VW dealer that the injectors had been superseded and no longer available and the new ones were not compatible for
fitting with the remaining OK ones so I felt I had no choice but to pay the 4 grand . (Didn't really want to chase around wreckers which might have worked? ) The good side of it was that my fuel consumption went down noticeably with the new injectors. 4.4 l/110 k
on trips (4.7 before). 5 around town from 5.3

[VW Convert]

One injector on my 2010 1.6 TDI Jetta failed at about 175,000 k.
I was told by my VW dealer that the injectors had been superseded and no longer available and the new ones were not compatible for
fitting with the remaining OK ones so I felt I had no choice but to pay the 4 grand . (Didn't really want to chase around wreckers which might have worked? ) The good side of it was that my fuel consumption went down noticeably with the new injectors. 4.4 l/110 k
on trips (4.7 before). 5 around town from 5.3

That's a lot of money to outlay at that sort of mileage, might have been better to try to source aftermarket. Also seems strange the replacement injector was not compatible with the existing, I wonder what was the difference?

Depending on fuel price in your area the fuel consumption reduction means it will take 1.2 million or so kilometres to recoup the investment!

Cheers

George

[rory]

The wiring loom not being compatible I think was one reason ?? I'll tell myself I'm enjoying the next 1.2 million kilometers

[asterixj91]

Do you mind If I ask how much were the 4 OEM?


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when i searched and found the "oem" ones from cheaper diesel i got them all for 1825. other places in europe were asking between 500-900 for each injector

I didn't look into them being reassembled as the mechanic said these ones in aus were difficult to take apart. but being a nice mechanic, he gave me the originals when he put the new ones in.

so if anyone is looking for original injectors to clean up

[Snail Style]

There was issues with the 77tdi injectors which showed itself as pinging under light to moderate throttle at around 1500RPM. After replacing them however they need to be calibrated to the engine module and also have a minimum quantity adaption run through, hope the mechanic did that as well.

[gldgti]

what do you mean pinging? we are talking compression ignition here, pinging is not a term you would normally use or associate with a diesel.

If a common rail diesel is injecting fuel at the wrong time (for arguments sake too early) but under specific engine load and rpm parameters, surely it would equate to some kind of sensor or ecu mapping problem... if it was a mechanical problem with an electronically actuated injector, I would expect the problem to present all the time - unless there was some kind of electrical interference under the specific conditions you mentioned...

[Idle]

I was under the impression that all diesels ping — that's what the diesel rattle is.

[Ryeman]

'knock' for diesel which is the basic idling noise but for petrol under significant load a higher pitched 'ping' ing more like nails in a glass jar.

[Idle]

That's more to do with the speed of the flame front — petrol evaporates quickly, the mixture explodes and the knock/ping is more high-pitched, diesel evaporates and burns more slowly with a deeper sound.

Compression ignition engines are designed to accommodate the pressures involved, petrol (spark ignited) engines mostly are not, hence the likelihood of damage.