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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 December 6th, 2017, 15:50   #1
Nero Morg
Join Date: Oct 2017
Location: Beaverton, OR
Default Boost issues

Hey all, still doing a slow revival of this car, can anyone make sense of this graph and the strange boost issues I'm having? Already done everything except check actuator rod travel. I'm about to do that, but wanted to get some $0.02.

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Old December 6th, 2017, 16:03   #2
Nero Morg
Join Date: Oct 2017
Location: Beaverton, OR

I may have answered my own question lol I checked movement, still easy travel since I cleaned it last week, but the rod starts moving the second I pump, maybe 1psig, and stops moving at 12psig. Looks like I need to adjust it and follow up
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Old December 11th, 2017, 10:14   #3
Veteran Member
Join Date: Aug 2008
Location: Reno, sort of...

Yes, having your actuator set to start moving at 5" of vacuum (not PSIG) and hit the stop at 18" is a good place to start. At full throttle in 3rd gear you optimally want your N75 valve % to be around 65%.
2001 Jetta GL TDI, Tinted, Ventectomy, Catectomy, EGR-ectomy, TDTuning, HIFLO .216's, Stealth 17/56 Garrett, VCDS Hex+CAN, South Bend Daily Driver 2 Clutch, DG Short Shifter, Frostheater, Baldwin Fuel Filter, Previous Diesel: 1983 Rabbit Diesel
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Old December 11th, 2017, 17:50   #4
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Join Date: Oct 2011
Location: Monroe, NY, USA

Someone will correct me if I'm wrong but if green is actual boost and yellow is requested boost (on the graph) I don't think you are getting boost.
Get the adjuster close to the vacuum range above as a start then refine it later.
When I replaced my actuator I think I checked it & it was close.
I found & was getting 20 to 25 LB boost easily and had a few limp modes.
I had to lengthen the arm a few times but now I can still get 20 LB with a moderate takeoff.
Will lengthen it again at my next oil change.
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Old December 12th, 2017, 09:42   #5
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Join Date: Oct 2005
Location: Il.USA
Fuel Economy: 43/41/40

Did you check for any DTC's(digital trouble codes)?
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