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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old July 11th, 2019, 07:06   #16
eddieleephd
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Join Date: May 2012
Location: Asheville, NC
Fuel Economy: 38mix / 47@70-75
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Try looking at the pressure when the engine is off. Should be about 14.7 psi.

It's difficult to know what the reading should be without a boost gauge installed on the vehicle.

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Old July 11th, 2019, 08:29   #17
Stephen417
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Would the map sensor be affected by temp? Right now in the morning I leave for work around 4:30 and itís cool enough where the thing feels almost normal, get out and itís 80 and the car is a turd


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Old July 11th, 2019, 09:11   #18
eddieleephd
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Hmm, that might be the fuel temperature sensor in the IP.
MAP shouldn't be affected by temperature, however, the MAF and fuel temp are

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Old July 11th, 2019, 10:59   #19
Stephen417
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Is there a way to test it?


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Old July 11th, 2019, 11:51   #20
BobnOH
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Location: central Ohio
Fuel Economy: 50/45/35
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OBDII (like VCDS)
There are several temperature settings, check them cold, then hot. If you see some wack reading, check the wires/connect then replace.
A4 TDI engine measuring blocks/groups
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Old July 11th, 2019, 12:01   #21
eddieleephd
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What Bob said.
As I have read, and keep reading, the map rarely fails. However, it does fail occasionally. Not sure what the resistance values are. I have a boost gauge and just compare that with log readings.
You said you put in a new MAF, was it OEM? This isn't a place to cheat.
I like having a couple spare parts and a 3 bar is $35 so I have one in the spare parts kit.
Don't seem like I'm being much help here, just giving ideas of where to look.
I would suspect the fuel delivery more than boost, unless your air mass is less than requested, but your pressure is like it is.
Remember I said before to log the MAF readings, that's so you can see if as much air is coming in as expected at those pressures

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Old July 11th, 2019, 12:19   #22
BobnOH
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Hold out, bump, for someone to look at your graph. There are a few folks who actually know what to look for. I see what looks like the requested bouncing out, but I don't know how to interpret these things.
https://log.malonetuning.com/chart/2...bCsQAAAA%3D%3D
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Old July 11th, 2019, 12:51   #23
Stephen417
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The MAF that I put in is OEM so I really donít suspect that


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Old July 11th, 2019, 12:52   #24
Stephen417
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Quote:
Originally Posted by BobnOH View Post
OBDII (like VCDS)
There are several temperature settings, check them cold, then hot. If you see some wack reading, check the wires/connect then replace.
A4 TDI engine measuring blocks/groups


I believe my coolant sensor is bad, it says 190 F on the dash but itís around 250 F on vcds. Could that be the cause of my problem?


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Old July 11th, 2019, 13:03   #25
eddieleephd
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If I remember correctly 205 is the top for acceptable temperature and the sensor is the likely culprit.
https://www.myturbodiesel.com/wiki/t...t-mk4-vw-audi/

https://forums.tdiclub.com/showthread.php?t=188334

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Old July 11th, 2019, 13:30   #26
Stephen417
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Quote:
Originally Posted by eddieleephd View Post
If I remember correctly 205 is the top for acceptable temperature and the sensor is the likely culprit.
https://www.myturbodiesel.com/wiki/t...t-mk4-vw-audi/

https://forums.tdiclub.com/showthread.php?t=188334

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I only question if thatís the problem because even when itís cold I still have the issue.


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Old July 11th, 2019, 13:38   #27
eddieleephd
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Check the temperature when it's cold and again when it's hot. The comparison should tell you. It's definitely a possibility and over of the first things to replace.

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Old July 11th, 2019, 19:05   #28
Stephen417
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Okay so I swapped it with a good oem one, itís reading correctly in vag com and still no improvement on power


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Old July 11th, 2019, 19:09   #29
Stephen417
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Quote:
Originally Posted by eddieleephd View Post
What Bob said.
As I have read, and keep reading, the map rarely fails. However, it does fail occasionally. Not sure what the resistance values are. I have a boost gauge and just compare that with log readings.
You said you put in a new MAF, was it OEM? This isn't a place to cheat.
I like having a couple spare parts and a 3 bar is $35 so I have one in the spare parts kit.
Don't seem like I'm being much help here, just giving ideas of where to look.
I would suspect the fuel delivery more than boost, unless your air mass is less than requested, but your pressure is like it is.
Remember I said before to log the MAF readings, that's so you can see if as much air is coming in as expected at those pressures

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When I went to look at the air mass specified vs actual... specified stayed at 850


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Old July 11th, 2019, 22:55   #30
Nevada_TDI
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IIRC, there should not be that much variance in the two temperature readings; If the factory temp sensor is still the stock one, yup, it should go. I don't remember if the "good one" is green or black in color. The MAP sensors do not often go bad, but they will go bad now-and-again. The temp reading on the dash is mostly an idiot light for people that don't understand how the temperature in a diesel will fluctuate. The other one reading significantly higher is the one the ECU sees and may be part of your problem. As was mentioned the fuel temp sensor in the top of the IP has a lot to do with retarding the timing when hot also killing power...
I came to this website over ten years ago, and could not be happier from the knowledge and insight the members here always offer. I am sharper now on my TDI than I was then, but I still have a lot to learn.
New nozzles are likely in your future, but until you get this problem solved, I would not do any modifications to the engine.
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Last edited by Nevada_TDI; July 11th, 2019 at 22:59.
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