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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old May 26th, 2018, 09:04   #1
WarmStart
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Default 1.9 TDI 81kw no power, all measurements OK.

Hello.

I have lack of power on my 1.9 TDI 81 kw. It's not limp mode but car are not moving as it should.
I have been driving this car more than 100 000 km. Had always been lack off power. Weird is that in some time (rarely) in second gear car accelerate as it should. And after a long trip towing heavy trailer car has more power than regularly but not long time.
I have check all mechanical thing what I can think and use ross-tech, all measurements are as they have to be, even the fuel quantity when accelerating is 44.4 (or similar) mg/stroke.

How ecu knows injected fuel quantity?
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Old May 26th, 2018, 20:09   #2
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Check for a leaking boost hose.
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Old May 27th, 2018, 02:44   #3
WarmStart
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I have checked boost and vacuum leaks more than three times last few years, no leaks. All vacuum solenoids have been cleaned and work good, good vacuum.
New turbo, adjusted as it's have to be.
Compared MAP with mechanical gauge.
New MAF.
I replace fuel filter at least once a year.
There are no black smoke behind the car (NEVER)! ECU is saying to the VCDS that there is fuel but actually there is not so much fuel as it should be.
Where does the ECU get info for the fueling?
Is she using needle lift sensor for that?
Or is she using map for that, ECU is saying to the Quantity Adjuster how much to move and the calculate fuel quantity, but Actually ECU does not see how much fuel there is?
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Old May 28th, 2018, 00:53   #4
duke21
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Same problem like i had always with my PPD170. I bet its something fuel related...
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Old May 28th, 2018, 08:40   #5
Yourbuddysatin
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What tdi are you working with?
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Old May 28th, 2018, 09:41   #6
Kerma_tuned
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Check the intake and make sure its not carnoned up? Over half the intake on my tdi was restricted because of carbon build up and made it feel like there was a lack of power
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Old May 28th, 2018, 10:20   #7
WarmStart
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I have 2004 Seat Leon with 1.9 TDI 81 kw engine.
I cleaned the intake and closed egr valve with metal plate.
That kind lack of power is quite "normal" with those older TDI-s.
I find a post where is information what I need: http://forums.tdiclub.com/showthread.php?t=339804
And little bit more:
http://forums.tdiclub.com/showthread...=350382&page=2
I think there are metal in the pump.
I'm gonna take pump apart and clean everything, let you know if it solves my problem.
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Old May 28th, 2018, 16:44   #8
Yourbuddysatin
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So is that a VE engine or PD? Not sure what years has what in those over seas....
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Old May 28th, 2018, 21:41   #9
WarmStart
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It is VE pump.
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Old May 29th, 2018, 08:18   #10
Yourbuddysatin
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Have you checked what the map sensor is measuring?
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Old May 29th, 2018, 12:19   #11
WarmStart
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Yes I have compared VCDS shown reading with manual pressure gauge, map sensor is showing accurate numbers.
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Old May 29th, 2018, 13:03   #12
Yourbuddysatin
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I could be wrong but what I’ve always thought is if you have boost you have fuel. So maybe you have a bent connecting rod or something to bleed the cylinder pressure? Kinda odd to me that you can make the correct boost but not have power?
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Old May 30th, 2018, 10:23   #13
WarmStart
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I taked apart the injector pump electronics and cleaned all the metal.
No difference!
I found in VCDS where I can check Quantity Adjuster voltage to the ECU.
min. -0.6...v
max.- 4.6...v
full throttle when accelerating.- 3.6..v


(some months ago I tried my friend car MAF. And compared reading with my own car MAF, reading was quite similars. Then I disconnected MAF and made same accelerations and then I reconnected the MAF (engine running) then car was acting like it should, tire spin in a second gear on a tarmac. MAF readings was exactly the same when car was not moving correctly.)
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Old May 31st, 2018, 05:54   #14
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I’m at a loss. Sounds very strange.
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Old May 31st, 2018, 06:47   #15
dieseleux
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Group 15, what Actual et Request value at WOT?
Group 10, what intake pressure at WOT and 3000-4000rpm?
Group 13, what value, engine >70celcius and idle, no light or AC.
Group 4, What actual and specified start? (cold engine)



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