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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 October 9th, 2019, 15:16   #1
peteguenther
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Join Date: Sep 2017
Location: vermont
TDI(s): 2003 Jetta
Fuel Economy: 40 in the hils 50 on the highway
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My Mk4 alh suffers occasional limpage usually on long hills with three passengers. Ive done the vac lines and cycled N75 with VAG Com. ( actuator works ) when I graph boost it seems always to spike then drop below expected then respike less - you may be able to see it in my photo gallery.
Is it Ok to manually activate and cycle the vanes and actuator with a wrench or something just to free things up in there? it seems the vanes cycle fully but not smoothly . Thanks
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Old October 9th, 2019, 18:19   #2
STDOUBT
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It's fine to manually cycle the actuator, but you'll have an easier time of it if you disconnect the actuator arm from the vane arm side. Mind the circlip they tend to sproing away at high speed in random directions.
EDIT: you can do it by hand that way. You don't want to fight the diaphragm -especially with metal on metal leverage.
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Last edited by STDOUBT; October 9th, 2019 at 18:21.
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Old October 9th, 2019, 19:54   #3
wonneber
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I lost a few clips trying to get them back on.
Tie a piece of thread or floss to the clip so it's easier to find if it flies.

After I retired and the car was not getting it's daily Italian tune up I got limp mode a couple times.
I ran the car on the highway in 4th for about 20 miles (10 one way, 10 back) at 3000 RPM.

Seemed to help.
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Old October 10th, 2019, 04:20   #4
ahldailydriver02
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I don't know the history of your car. How long have you had it? If its new to you then maybe the actuator was not installed with proper rod length. Also the turbo vanes maybe getting full of carbon, take it out and give it hell a few times to clean the turbo out, or try the Easy-Off oven cleaner method.
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Old October 10th, 2019, 08:29   #5
wonneber
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Quote:
Originally Posted by ahldailydriver02 View Post
I don't know the history of your car. How long have you had it?
If your replying to mine, I bought it new.
Replaced the actuator a few years ago & did the 3 & 19 inches adjustment.
Hoses & N75 a year or two ago.
Arm did have a slight sticky but working it seemed to clear it.

A while after retiring I got limp mode a few times & remembered a few posts quite a while back indicating to run it at higher RPMs on the road & it did seem to help.

Last edited by wonneber; October 10th, 2019 at 08:31.
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Old October 10th, 2019, 09:04   #6
ahldailydriver02
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Yes sorry I was replying to you Wonneber.

Well maybe it just needs a good running at higher RPMs a few times or a good cleaning.
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Old October 10th, 2019, 16:12   #7
peteguenther
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TDI(s): 2003 Jetta
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Ya the hi reves seem to help and i get plenty of that here in vermonts hills with no limp = its the long loaded pulls in fourth that trigger it when it happens
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Old October 10th, 2019, 17:26   #8
Dhawk12
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OP have you checked that your actuator is holding vacuum? Mine was the same issue. Could drive it like I stole it and nothing, but pulling up a long hill would cause it to trip everytime. Checked and the actuator wasn't holding vacuum. Swapped it out, did the adjustments and no limp mode since.

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Old October 10th, 2019, 19:34   #9
wonneber
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There is a VW bulletin about the actuators rusting inside raising havoc.
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Old October 11th, 2019, 06:34   #10
ahldailydriver02
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Agreed, get yourself a Mityvac and check the actuator. The actuator rod should start to move between 3-5 in.Hg and stop at 18 in.Hg and should be able to hold at 18. If its starts to drop after several seconds then your actuator is probably the culprit.
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Old October 11th, 2019, 09:44   #11
BobnOH
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Quote:
Originally Posted by wonneber View Post
There is a VW bulletin about the actuators rusting inside raising havoc.
Almost makes me want to laugh. Most dealer repair companies would just replace the whole thing ($200+), just us little forum fishes discovered you can just replace the actuator.
Great idea for those symptoms, see if there's not a slow loss of vacuum in that line from N75 down to the turbo. It could be just the hose or the actuator is done. The actuator is an easy repair on the VE. If you loose the clip, a suitable replacement can be found at your local hardware.
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Old October 12th, 2019, 03:45   #12
peteguenther
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Join Date: Sep 2017
Location: vermont
TDI(s): 2003 Jetta
Fuel Economy: 40 in the hils 50 on the highway
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Well that makes sense! Guess I'll have to break down and buy a mighty vac. below should be the link to boost graph:

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