Hi,

 

Need to replace the four glow plugs as part of general maintenance due to mileage.

 

Someone said when I was about to purchase that I needed one with a pressure sensor?

 

Could anyone point me in the direction of 4 plugs that are the correct ones please?

 

2019 Diesel Superb estate 2.0 TDI

What mileage are you at?

 

I'm not aware of the 2.0 TDi CR engine going through glowplugs prematurely, the 1.9 PD engine yes, the pre PD in my MK1 Octavia went to its maker after3250000 miles on the original glowplugs with them still working fine.

 

I dont plan to replace those on my current 2.0TDi CR engine unless one fails but if someone knows better and can tell me one is likely to go by X mileage and cause the engine to go into limp mode then I would replace them before then.

 

On the PD all 4 glowplugs having failed made zero difference to starting, brought up no dashboard lights, did not cause limp mode, but for a VCDS scan I would have been completely unaware, I replaced them but it made zero difference.

270k now and still on original plugs.

 

Tickover is lumpy.

The glowplugs could only hypothetically affect tickover in the couple of minutes after a cold start, absolute maximum more likely to be a few seconds.

 

If your vehicle has had the emissions fix then the throttle valve is likely to be completely crudded up, that would be my first port of call.

Thanks for the help. Hmmm. I’m wondering if it’s the timing belt then possibly?

50 minutes ago, Lamplighterson said:

Thanks for the help. Hmmm. I’m wondering if it’s the timing belt then possibly?

Guessing generally leads to very expensive errors.

Have a look at* the throttle valve as suggested, or get a VCDS scan to see if any faults show up.

 

 

* Edit - as in examine visually by disconnecting pipework from it, not as in 'buy a new one'

Edited 10 December, 20241 yr by Breezy_Pete

Well I have an ODB reader but that reports no faults.
 

It feels like it’s running on three cylinders - as if it had a dirty spark plug in a petrol engine. Which is why I thought it might be the glow plugs.

 

Will check the throttle valve. Well I’ll go search on where it is first 🤣🤣🤣

The glow plugs are there to prewarm the cylinder before starting on cold days. If the engine is already warm from an earlier start or the ambient temperature is high enough, then they do not operate at all. You have a warning light on the instrument panel that should light up briefly and then go out if the combustion chamber is warm enough to allow the engine to start easily. If the glow plug is on, then the engine should not crank over until it goes out.

 

 

Thank you so much.

 

Must be something else. The car is running rough as if on three cylinders.

 

Really appreciate the help.

Perhaps get the cylinder compression tested and also the injectors should also be tested, it is not unheard of that injectors fail.

 

This video may help you.

 

 

23 hours ago, J.R. said:

I'm not aware of the 2.0 TDi CR engine going through glowplugs prematurely, the 1.9 PD engine yes, the pre PD in my MK1 Octavia went to its maker after3250000 miles on the original glowplugs with them still working fine.

3¼ Million miles in an Octavia must be a record!

Trying to find the throttle valve - can anyone help please?

Pop a photo of your engine up, minus any removable top cover.

 

Edited 17 December, 20241 yr by Lamplighterson
Wrong text

There are about 3 throttle valves on this engine, give us a clue?

 

One RHS of charge cooler down the side of the airbox, one on the exhaust, one possibly on the other Low pressure EGR

Edited 17 December, 20241 yr by SuperbTWM

On 10/12/2024 at 18:06, J.R. said:

The glowplugs could only hypothetically affect tickover in the couple of minutes after a cold start, absolute maximum more likely to be a few seconds.

 

If your vehicle has had the emissions fix then the throttle valve is likely to be completely crudded up, that would be my first port of call.

Its the throttle valve mentioned above.

There was no 'Emissions fix' on that engine as far as i'm aware.

 

A better use of your time and money would be to get the car looked at by somebody with the right equipment and knowledge to diagnose the issue. Messing with things and potentially introducing more faults is really going to annoy the next guy that tries to fix it.

 

 

 

 

 

 

 

Well everyone else on this forum has been so helpful so I’ll wait for their replies. Thanks though.

Sorry, forgot to mention, the throttle valve @J.R. was referring to is down by the airbox, if you follow the charge air route from the turbo to the front of the car you will see it before the airflow goes into the charge cooler although it might be sanwiched between the other EGR stuff and be a pig to look at. Removal of the airbox will be probably be necessary 

Thank you