TDI Operating temperature

[Seatman]

Yep, if you disconnect it and notice an increase the MAF is bad and if its worse or even about the same its most likely OK.

Now I know that isn't acurate, my neighbours maf failed on her tdi and unplugging it made no difference but after replacing it the car is transformed and I mean transformed.

 

[jettawreck]

I'd avoid using the brake cleaner. Is the MAF on this engine the film or wire type? If film, I've heard that they really can't be cleaned with MAF cleaner because it will damage the film. Sounds like too much oil was sprayed on that K&N filter. That'll kill a MAF quick.

According to Oilhammer (search for his discription in the post) they are a film type.

 

[jettawreck]

Now I know that isn't acurate, my neighbours maf failed on her tdi and unplugging it made no difference but after replacing it the car is transformed and I mean transformed.

Sorry, I guess that's what happens when general statements are made. I've had three MAFs fail and they all have acted a bit different, so yes, that statement (and probably many others) I made isn't accurate in all cases.

 

[Seatman]

Sorry, I guess that's what happens when general statements are made. I've had three MAFs fail and they all have acted a bit different, so yes, that statement (and probably many others) I made isn't accurate in all cases.

Lol these cars are sent to baffle and confuse but we must continue this battle and win this war

 

[wndboy]

I replaced my orinal thermostat and have another question. Regarding replacing the radiator fluid? I bought some G12 from the dealership. Do I put the whole gallon in and fill the rest with distilled water? How important is the ration of G12 to water? Does anyone know the system capacity? Thanks

 

[Ski in NC]

I mix the g-12 with distilled water 50/50 and use that to refill. All it takes is an empty, clean jug to mix in. Once back on the road, you will need to top up a bit and just use the mix to do it. I changed my t-stat and I think I put in a gallon of mix.

 

[wndboy]

I mix the g-12 with distilled water 50/50 and use that to refill. All it takes is an empty, clean jug to mix in. Once back on the road, you will need to top up a bit and just use the mix to do it. I changed my t-stat and I think I put in a gallon of mix.

Thanks Ski. When I changed the T Stat back to the original, I bleed most of the Rad Fluid I think. I opened the bottom hose on the rad and placed a towel on the reservoir and blew into it. It definately got alot more fluid to come out. I did this until I could not get any more. I then took the upper hose on the right side of the motor off and pored the full bottle of G12 and then added distilled water... and refilled reservoir several times until it topped off. I then noticed the leak where I had replaced the original t stat. So I guess I have probably to much water and not enough G 12. I bought another bottle from dealer and am trying to figure out just how much to put in. any other suggestions would be apreciated

 

[jettawreck]

Mix the G12 and water BEFORE adding to the cooling system, not IN the cooling system.

 

[eeonmomberg]

My tdi bew temp on my cluster says it's always at 190 but when I have my obd11 plugged in I hit 208 the other day, freaked me out so I drove a bit less aggressive, it's also 115 degrees out so I figured that had something to do with it but it normally says it's around 180, should I worry that my cluster isn't giving me the right readings and from what I'm reading here my temps where perfectly fine

 

[Nuje]

If you read around here (and probably this thread), you'll find that the cluster reads 190F (90°C) anywhere from around 75°C to 105°C. So, particularly given the ambient temps you're driving in, perfectly normal.
More details here (should you want it to read accurately):

Cluster Mods

Cluster Mods - Welcome enable the "welcome" cluster message Done this today on my full FIS sport cluster, you change address 417 and change 02 to 6B :) ******************************************************* using vagtacho and the hex editor program XVI32...

forums.tdiclub.com

 

[eeonmomberg]

If you read around here (and probably this thread), you'll find that the cluster reads 190F (90°C) anywhere from around 75°C to 105°C. So, particularly given the ambient temps you're driving in, perfectly normal.
More details here (should you want it to read accurately):

Cluster Mods

Cluster Mods - Welcome enable the "welcome" cluster message Done this today on my full FIS sport cluster, you change address 417 and change 02 to 6B :) ******************************************************* using vagtacho and the hex editor program XVI32...

forums.tdiclub.com

Ok cool ty, also at what temp will the engine be harmed just so I know? Head gasket is the first thing to go right?

 

[x1800MODMY360x]

Mine is 166F-230F that is the Range where it hits 190F or move off of 190F.

Like many says, it's an idiot gauge.

 

[grafixmaster]

I use a BlueTooth OBD dongle, and Torque Pro on a phone to keep an eye on these things. Really easy to read what is going on with the sensor.

A couple of really good reads here
MAF readings (normal)
Tickover: 2.0-liter Engine: Expect around 2.0 to 2.5 g/s.
Under load/acceleration: 2.0-liter Engine: Expect readings of around 10.00 to 14.00 g/s.
Cruising motorway: 2.5-liter Engine: Typically 12.00 to 16.00 g/s.
(https://carmiddleeast.com/what-should-maf-read-at-idle/)

My own TDI engine goes up to 60 g/s though, and it's behaving well.

https://www.alldata.com/sites/default/files/file-attachments/maf_sensor_testing_110918.pdf
on a graph of rpm vs Grams/Sec measured by the MAF
Good sensor will be linear
Sensor out of calibration may rise too quickly
Dirty sensor rise slowly (or air leak downline)

Good sensor will rise at the same rate as the TPS (Throttle position Sensor on a petrol)
Diesel cars TPS is usually fully open (80%) all the time as acceleration is controlled by injector timing.
Diesel cars TPS drops below 30% when doing a regen, to make the mixture lean and rase the temperature.

 

[eeonmomberg]

What about normal oil temps? Does anyone know what that is suppose to be when driving? I just installed an oil temp gauge and it hardly ever reads above 140 which i know is way low, I have glowshift sending me another temp sensor but from what I've read it should be about 10 degrees F higher than coolant temp once it's up to temp, I know oil takes longer to get up to temp but I've driven over an hour and hit 180 once through the city and highway it's 120-140

 

[grafixmaster]

Engine oil temps will be higher than engine water temps as there is no BIG oil radiator and thermostat to keep it as regulated as water temps.
Real Water temps range 75-90 Deg C. (not what you see on your dial cluster - feel good faker dials )
But the water temperature will, in part, regulate the oil temperature as well, as it all flows around the engine block.
I usually see 10 to 20 Deg C higher on the oil temp. So 95-105 Deg C. from memory, but I'm a cruiser.

I'm doing a good run tonight, I'll keep a closer eye on it and let you know if I get something different.
2ltr TDi

 

[eeonmomberg]

Engine oil temps will be higher than engine water temps as there is no BIG oil radiator and thermostat to keep it as regulated as water temps.
Real Water temps range 75-90 Deg C. (not what you see on your dial cluster - feel good faker dials )
But the water temperature will, in part, regulate the oil temperature as well, as it all flows around the engine block.
I usually see 10 to 20 Deg C higher on the oil temp. So 95-105 Deg C. from memory, but I'm a cruiser.

I'm doing a good run tonight, I'll keep a closer eye on it and let you know if I get something different.
2ltr TDi

Awesome I would appreciate that, my golf bew is running great but I just wanna know so I can get a gauge that reads right so I can monitor it, next gauge is a water temp but I'm just getting going on upgrades now so egt will be after that

 

[P2B]

next gauge is a water temp but I'm just getting going on upgrades now so egt will be after that

It is possible to tweak the cluster to make the existing gauge accurate.

 

[jettawreck]

It is possible to tweak the cluster to make the existing gauge accurate.

Even easier to plug in a ScanGage ll and monitor many different data points at once

 

[eeonmomberg]

It is possible to tweak the cluster to make the existing gauge accurate.

How is that done

 

[travelfreak]

To show the details while driving, I used to connect my mobile to obd device and project the data to music system using CarPlay.

IMG_0129.jpeg

• travelfreak
• Dec 22, 2024

I am using car scanner elm app and gate icar pro 2s.

 

[eeonmomberg]

To show the details while driving, I used to connect my mobile to obd device and project the data to music system using CarPlay.

IMG_0129.jpeg

• travelfreak
• Dec 22, 2024

I am using car scanner elm app and gate icar pro 2s.

I don't have a giant after market screen in car which is why I'm trying to do gauges, don't like having my phone hooked up to obd11 while I'm driving either

 

[travelfreak]

Even any system with CarPlay or android auto can do this. However, you have to use mobile. If your system is Android, then no need to hook phone. Screen size doesn’t matter.

 

[jayb79]

How is that done

See link in post #40 above

 

[jettawreck]

I don't have a giant after market screen in car which is why I'm trying to do gauges, don't like having my phone hooked up to obd11 while I'm driving either

Search for ScanGage ll by Linear Logic.
I have bought a couple used on eBay.
I see they now have a lll version.

 

[Nuje]

And for the record, you definitely want your oil temps to get up over 100°C on a regular basis to boil off the water content that can accumulate during short trips in the winter / colder months.

 

[eeonmomberg]

And for the record, you definitely want your oil temps to get up over 100°C on a regular basis to boil off the water content that can accumulate during short trips in the winter / colder months.

Ya i know that, I have the sensor hooked up to the oil filter housing, idk if the sensor is got is off or if the oil isn't getting up to the right temp, it will hit 180 if I sit there and let the engine run for 30 min but that's the highest ive seen it get, just wanna make sure it's getting that water out, should I put a bung in the oil pan and shield it in there? Would defeat the purpose of this kerma tdi adapter

 

[Nuje]

it will hit 180 if I sit there and let the engine run for 30 min but that's the highest ive seen it ge

Find a mountain road up to a ski hill and drive up with "urgency". Guaranteed that'll heat that oil up for you.