Unknown boost issue

Stephen417

Member
Joined
Jul 23, 2018
Location
Lunenburg
TDI
2003 Jetta 1.9
Hey all, my 2003 Jetta ALH has me STUMPED. I love these cars but there is alot to learn for sure. anyway i seem to have no real boost. one thing i should mention is that if its 60 degrees (f) outside it has better boost than 80 degrees. i know these cars do run better in the cold but it seems very very exaggerated. but nevertheless ive replaced n75 valve, MAF, all vacuum lines, turbo, air filter and fuel filter but nothing seems to help. i buckled down and got vcds so i could provide real data here and try to get expert help. here is a log for block 011
Code:
Tuesday,09,July,2019,19:58:03:26115-VCID:57BD313EB56B67F788-4B06,VCDS Version: Release 19.6.1,Data version: 20190529 DS308.0
038 906 012 FD,,1.9l R4 EDC G200SG  4102,
,Group A:,'011,,,,Group B:, Not Running,,,,Group C:, Not Running
,,Engine Speed,Boost,Boost,Charge Pressure,,,,,,,,,,
,TIME,(G28),Specified,Actual,(N75) Solenoid,TIME,,,,,TIME,,,,
Marker,STAMP, /min,,, %,STAMP,,,,,STAMP,,,,
,0.04,903,994.5,1053.0,24.7,,,,,,,,,,
,0.31,903,994.5,1053.0,24.7,,,,,,,,,,
,0.64,903,994.5,1053.0,24.7,,,,,,,,,,
,0.96,903,994.5,1053.0,24.7,,,,,,,,,,
,1.28,903,994.5,1053.0,24.7,,,,,,,,,,
,1.60,903,994.5,1053.0,24.7,,,,,,,,,,
,1.92,1449,1193.4,1041.3,27.1,,,,,,,,,,
,2.23,1974,1579.5,1088.1,41.0,,,,,,,,,,
,2.54,2121,1755.0,1287.0,24.7,,,,,,,,,,
,2.86,2016,1766.7,1497.6,42.2,,,,,,,,,,
,3.17,1827,1907.1,1661.4,30.3,,,,,,,,,,
,3.48,1722,1942.2,1719.9,36.7,,,,,,,,,,
,3.79,2268,2199.6,1766.7,42.6,,,,,,,,,,
,4.11,2751,2199.6,2141.1,66.9,,,,,,,,,,
,4.42,3213,2199.6,2492.1,77.3,,,,,,,,,,
,4.73,3612,2199.6,2574.0,75.7,,,,,,,,,,
,5.04,4053,1181.7,2375.1,94.4,,,,,,,,,,
,5.36,3633,1053.0,1556.1,94.4,,,,,,,,,,
,5.66,2646,1614.6,1205.1,68.1,,,,,,,,,,
,5.98,2457,2199.6,1205.1,24.7,,,,,,,,,,
,6.29,2583,2199.6,1450.8,26.7,,,,,,,,,,
,6.60,2730,2199.6,1836.9,64.5,,,,,,,,,,
,6.92,2940,2199.6,2340.0,76.1,,,,,,,,,,
,7.23,3129,2199.6,2281.5,62.6,,,,,,,,,,
,7.54,3318,2199.6,1977.3,60.2,,,,,,,,,,
,7.86,3486,2199.6,2000.7,62.2,,,,,,,,,,
,8.17,3654,2199.6,2024.1,60.6,,,,,,,,,,
,8.48,3822,2199.6,2024.1,59.4,,,,,,,,,,
,8.80,3969,2199.6,2012.4,57.0,,,,,,,,,,
,9.11,4116,2164.5,2012.4,58.2,,,,,,,,,,
,9.42,4284,2094.3,2024.1,59.8,,,,,,,,,,
,9.73,4431,1977.3,2012.4,61.8,,,,,,,,,,
,10.04,4116,1088.1,1684.8,90.4,,,,,,,,,,
,10.36,3087,2199.6,1251.9,58.2,,,,,,,,,,
,10.67,2961,2199.6,1450.8,33.5,,,,,,,,,,
,10.98,3024,2199.6,1848.6,50.2,,,,,,,,,,
,11.29,3087,2199.6,2340.0,67.3,,,,,,,,,,
,11.61,3171,2199.6,2562.3,72.1,,,,,,,,,,
,11.92,3255,2199.6,2398.5,61.8,,,,,,,,,,
,12.23,3339,2199.6,2106.0,59.0,,,,,,,,,,
,12.55,3444,2199.6,2024.1,57.4,,,,,,,,,,
,12.86,3528,2199.6,2024.1,56.6,,,,,,,,,,
,13.17,3612,2199.6,2047.5,55.4,,,,,,,,,,
,13.48,3696,2199.6,2070.9,55.8,,,,,,,,,,
,13.79,3759,2199.6,2094.3,55.4,,,,,,,,,,
,14.11,3843,2199.6,2106.0,54.6,,,,,,,,,,
,14.42,3927,2199.6,2129.4,54.2,,,,,,,,,,
,14.73,3990,2199.6,2129.4,54.2,,,,,,,,,,
,15.05,4074,2176.2,2141.1,54.6,,,,,,,,,,
,15.36,4137,2152.8,2152.8,55.8,,,,,,,,,,
,15.67,3990,1088.1,2094.3,77.3,,,,,,,,,,
,15.98,3381,1041.3,1392.3,73.3,,,,,,,,,,
,16.29,3003,2199.6,1251.9,27.1,,,,,,,,,,
,16.60,3045,2199.6,1556.1,35.1,,,,,,,,,,
,16.92,3087,2199.6,2070.9,62.6,,,,,,,,,,
,17.23,3045,1029.6,2187.9,94.4,,,,,,,,,,
,17.54,3066,1029.6,1380.6,69.7,,,,,,,,,,
,17.85,3066,1029.6,1158.3,51.8,,,,,,,,,,
,18.17,3066,1029.6,1123.2,48.6,,,,,,,,,,
,18.48,3045,1134.9,1123.2,48.2,,,,,,,,,,
,18.79,3045,1532.7,1193.4,28.3,,,,,,,,,,
,19.11,3087,1544.4,1532.7,54.2,,,,,,,,,,
,19.42,3108,2035.8,1825.2,33.1,,,,,,,,,,
,19.73,3129,2199.6,2082.6,53.0,,,,,,,,,,
,20.04,3150,2199.6,2433.6,68.1,,,,,,,,,,
,20.36,3192,2199.6,2585.7,68.5,,,,,,,,,,
,20.67,3213,2199.6,2574.0,70.9,,,,,,,,,,
,20.98,3255,2199.6,2316.6,61.8,,,,,,,,,,
,21.29,3024,1029.6,1778.4,94.4,,,,,,,,,,
,21.61,2604,1017.9,1251.9,65.3,,,,,,,,,,
,21.92,2457,2199.6,1123.2,53.0,,,,,,,,,,
,22.23,2520,2199.6,1228.5,24.7,,,,,,,,,,
,22.54,2541,2199.6,1532.7,36.7,,,,,,,,,,
,22.86,2541,2199.6,1989.0,62.2,,,,,,,,,,
,23.17,2562,2199.6,2433.6,78.5,,,,,,,,,,
,23.48,2583,2106.0,2152.8,61.4,,,,,,,,,,
,23.79,2583,1170.0,1661.4,93.6,,,,,,,,,,
,24.11,2562,1017.9,1310.4,70.5,,,,,,,,,,
,24.42,2562,1017.9,1123.2,59.4,,,,,,,,,,
,24.73,2562,1017.9,1076.4,55.8,,,,,,,,,,
,25.04,2541,1017.9,1064.7,55.0,,,,,,,,,,
,25.36,2520,1017.9,1053.0,54.6,,,,,,,,,,
,25.67,2520,1017.9,1053.0,54.6,,,,,,,,,,
,25.98,2499,1017.9,1053.0,49.4,,,,,,,,,,
,26.29,2499,1017.9,1064.7,49.4,,,,,,,,,,
,26.61,2478,1017.9,1076.4,49.4,,,,,,,,,,
,26.92,2478,1017.9,1076.4,49.0,,,,,,,,,,
,27.23,2457,1017.9,1088.1,49.0,,,,,,,,,,
,27.54,2436,1017.9,1088.1,49.0,,,,,,,,,,
,27.86,2415,1017.9,1088.1,48.6,,,,,,,,,,
,28.17,2394,1017.9,1099.8,48.6,,,,,,,,,,
,28.48,2352,1006.2,1099.8,48.2,,,,,,,,,,
,28.80,2331,1006.2,1088.1,48.2,,,,,,,,,,
,29.11,2310,1006.2,1088.1,47.8,,,,,,,,,,
,29.43,2289,1006.2,1088.1,47.8,,,,,,,,,,
,29.73,2268,1006.2,1088.1,47.4,,,,,,,,,,
,30.06,2247,1006.2,1088.1,47.4,,,,,,,,,,
,30.36,2226,1006.2,1088.1,47.4,,,,,,,,,,
,30.67,2226,1006.2,1088.1,47.0,,,,,,,,,,
the actuator holds vacuum and appears to be set correctly as i tested it with a vacuum pump.

important: its also got a stage 1 tune by jeff
 
Last edited:

eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
Also, please take any boost log to Malone's website and drop it in the webpage. It will graph it for you and you can pay the address as a link in your post.
https://malonetuning.com/

Good thinking getting a VCDS though, overwise, it's really difficult to get anywhere.

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Stephen417

Member
Joined
Jul 23, 2018
Location
Lunenburg
TDI
2003 Jetta 1.9
boost graph

HTML:
https://log.malonetuning.com/chart/260771#H8KLCABLPCZdAgNNwo7DgQrDgjAMQH9lw6TDnMOCKsKewrx5w7IjSg%2FDkcKFWsOYwprCkWbCssO5w7XCrsKdwojCt8OkPV7CiMO3w7DDoMOpwp4yw5kowrzDjAVMH0zChSNLesOTwr4awojClElQCQ7Ck18kasKVw61qcU3CtTgaHAbCu8O9EEjCik9tSSHDvRPDvhQMwrgmcFEuw7PCmMK0cnfCrkgow6PDtH3CpsKdwrnDlcKpwrtewrrDnsOtUcO4AMKuIsOLJsKxAAAA
 

eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
Looks like your busy is okay pressure wise.

Have you checked your intake to see if it's clogged. I haven't had the chance to look at the logs on my computer, however, I'm thinking your intake is getting clogged limiting the amount of air actually going in.
Red is actual pressure and blue is requested pressure. The difference between pressure and volume is based on the opening of the intake. When they get clogged the boost pressure goes up but air volume goes down.

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eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
Okay, just looked at it on the laptop and definitely think it's a clogged intake issue.


Two things to do here
1. run a log with the requested and actual MAF (mass air flow) to show what that's doing.
2. pull the hose to the EGR/intake manifold and look inside to see if its closing up and restricted.


I like the thought to HTML bracket the link, however, it's unnecessary with a link.
Definitely a great idea with the log reading as it will limit the page space used!
Of course you probably already know this...
 
Last edited:

Nevada_TDI

Top Post Dawg
Joined
Aug 17, 2008
Location
Reno, sort of...
TDI
2001 Jetta TDI
Steven, you have a Stage 1 tune, so I will guess your injector nozzles are factory? I don't know what your mileage is, but to r-n-r your nozzles is likely about due. Swap your nozzles, and upgrade your tune., happy, happy, happy.
 

Stephen417

Member
Joined
Jul 23, 2018
Location
Lunenburg
TDI
2003 Jetta 1.9
I currently have an egr delete as well but I have left it intact for now.. when I replaced the turbo I cleaned the intake so it should be clean .


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eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
Nevada tdi is right then. Injector time, possibly maf also.
Usually the map doesn't go bad, however, it might be refreshed.

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eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
How would I check and adjust this ? I’ve already swapped the maf


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The map is simply a replacement item as is the MAF. Is on the intercooler and easiest to remove the intercooler to get to it.
Injectors you must pull and send for new nozzles and calibration.
The only other piece of the puzzle to look at if the IP and what it's delivering to the injectors. Crack one open at the injector and see how much comes out when cranked. Easiest with someone else cranking the engine.


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Stephen417

Member
Joined
Jul 23, 2018
Location
Lunenburg
TDI
2003 Jetta 1.9
Is there a reading I should take on the map sensor? I’ll probably shoot that at it first and if it doesn’t work I’ll buy new nozzles


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eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
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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Stephen417

Member
Joined
Jul 23, 2018
Location
Lunenburg
TDI
2003 Jetta 1.9
Would the map sensor be affected by temp? Right now in the morning I leave for work around 4:30 and it’s cool enough where the thing feels almost normal, get out and it’s 80 and the car is a turd


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eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
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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eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
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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Stephen417

Member
Joined
Jul 23, 2018
Location
Lunenburg
TDI
2003 Jetta 1.9

eddieleephd

Top Post Dawg
Joined
May 27, 2012
Location
Battle Ground, Wa
TDI
2002 jetta Wagon
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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Stephen417

Member
Joined
Jul 23, 2018
Location
Lunenburg
TDI
2003 Jetta 1.9
Okay so I swapped it with a good oem one, it’s reading correctly in vag com and still no improvement on power


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Stephen417

Member
Joined
Jul 23, 2018
Location
Lunenburg
TDI
2003 Jetta 1.9
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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Nevada_TDI

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Joined
Aug 17, 2008
Location
Reno, sort of...
TDI
2001 Jetta TDI
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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