Audi AEL no power

[bn-01-wso]

Hi. I have some problems with my AEL. It doesnt pull as it used to. From what i can see on vag com it doesnt boost as it should. Anyone had similar problems before? It gets 15seconds from 0-100km/h I changed alot of stuff and it does the same thing. I changed injection pump, injectors, turbo, MAF. It starts well, timing is ok. Made a boost leak, everything is ok. I dont know what to change anymore. Here is a short log from 3rd gear. Any advice is welcome. Thanks alot


Monday 18 April 2016 14:05:09
4A0 907 401 P 2.5l R5/2VT EDC HS D02

Group A: '001 Group B: '003 Group C: '011
RPM Inj. Quantity Voltage Temperature RPM Mass Air / Rev. Mass Air / Rev. Duty Cycle RPM Absolute Pres. Absolute Pres. Duty Cycle
TIME TIME TIME
MARKER STAMP /min mg/R V °C STAMP /min mg/R mg/R % STAMP /min mbar mbar %
0.00 1426 27.6 2.240 88.2 0.49 1490 661.7 553.6 5.1 0.98 1598 1591.2 1142.4 5.1
1.46 1685 29.2 2.440 88.2 1.95 1771 756.9 618.5 5.1 2.44 1858 1805.4 1275.0 5.1
2.93 1944 37.3 2.800 88.2 3.42 2074 921.2 787.2 5.1 3.91 2182 1917.6 1611.6 5.1
4.39 2311 40.5 3.040 88.2 4.88 2441 938.5 973.1 5.1 5.37 2549 1917.6 1927.8 10.9
5.86 2657 39.5 3.140 88.2 6.35 2765 955.8 1051.0 5.1 6.84 2873 1907.4 1999.2 21.5
7.33 3002 38.9 3.180 88.2 7.81 3110 955.8 1025.0 5.1 8.30 3197 1897.2 1917.6 20.7
8.79 3283 38.6 3.280 88.2 9.28 3391 947.2 1007.7 5.1 9.77 3478 1887.0 1887.0 21.5
10.26 3586 38.3 3.320 88.2 10.75 3694 925.6 960.2 5.1 11.23 3737 1866.6 1856.4 21.5
11.73 3845 38.0 3.380 88.2 12.22 3910 899.6 899.6 5.1 12.70 4018 1836.0 1836.0 22.3
14.66 4320 36.7 3.500 88.2 15.15 4385 821.8 808.8 5.1 14.17 4255 1836.0 1815.6 20.7

[AndyP]

Does it have chips in? I though Std boost was 0.8bar, looks like you're getting more than that. Have you done a compression test?

[bn-01-wso]

It has new rings, rebuilt head. It had 28-30bar before rebuild. I've spent alot of money on it and still doesnt work as it should. It is chiped but goes like an SDI

[quattromnc]

Do you have a cat on the car, could it or another box have started to collapse on the exhaust causing build up of gasses? Hard to tell from exhaust noise alone.

[bn-01-wso]

Cat was removed. Originally was an URS6 so it has AAN exhaust. I removed the exhaust right near the turbo, same story. I cant hear the turbo wistle.

[quattromnc]

Wastegate issue?

[bn-01-wso]

I changed the turbo and is running exactly the same. Before that i removed the old turbo to see if the wastegate valve is blocked or something. Valve was ok although the spring was pretty soft. I dont know how much pressure it should hold though.

[bn-01-wso]

Could it be a problem with the boost control solenoid? I couldnt find a new one to see if it makes any difference

[ManiacuV6]

test the F***ing wastegate

[AndyP]

Do you know what it's supposed to boost to?

[diesel des]

My reading of your logs show requested and actual boost are broadly similar so boost isn't the issue. Is it Smokey?

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[Jukums]

And what about injection quantity ? When engine have 90 degrees temperature.


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[quattromnc]

After replying earlier in this thread, I had a niggling feeling I'd seen this issue in the past, here's a post I replied to almost 6 years ago on Audifans.net!

http://www.audifans.net/ftopicp-228990.html

Your figures match up precisely to what was discussed in the Audifans post, as AndyP thought it should boost to around 0.8-9 bar, the ECU readings include normal atmospheric pressure which dependant on weather is normaly 1.0bar or 1000mbar.

I'm assuming the two columns in your spreadsheet quoting boost pressures are, requested on the left, actual on the right. At low revs the boost pressure is slow to respond (lag) but then it fires up in to life as the RPM's climb, and from 2000rpm upwards the boost kicks in. So, having reviewed this, whatever your problem is, it doesn't seem to be boost pressure.

Where to go from here? Assuming we've ruled out boost pressure lets look at what could be causing this...

Fuel delivery,
Combustion,
Exhaust blockage,
Transmission or brake drag.

The first two can be verified by the Lambda reading, I'm not sure what you should get on that, maybe someone else could shed some light, but either way, if your engine doesn't burn right those numbers should be out. Have you checked injectors? Maybe worth checking compression again, I know you've not long had it checked but worth doing again IMHO.
Exhaust blockage self explanatory, remove the sections and inspect, if there is a blockage I doubt it will be a complete blockage as it does get full boost.
Last thing I can think of just now is that the engine is making all the power it should but it either isn't being delivered properly. lift each wheel and check how they turn individually checking for any binding of brakes or anything else. Do you have an auto or manual gearbox? when was the last time fluds were checked? On that note, when was the last engine oil change?

Lots to consider there, hopefully thats you a little closer to a solution.

[bn-01-wso]

test the F***ing wastegate

I f***ing tested it. Removed it form turbo housing and see if its blocked, then tested the valve with fluid and see if it seals right. All seems to be right.

[bn-01-wso]

My reading of your logs show requested and actual boost are broadly similar so boost isn't the issue. Is it Smokey?

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It doesn't smoke. When it worked fine at 2000+rpm it felt more alive. You could feel to turbo kicking in.