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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old May 25th, 2019, 05:21   #301
JETaah
 
Join Date: Jan 2001
Location: mi 48836
Fuel Economy: 53 max, 42 min, average 46
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Quote:
Originally Posted by memphisride View Post
Hello, My 1999 1.9 TDI goes into limb mode when going up an incline at around 3000 RPM. I can also make it do it on the flat if I put the pedal to the floor. It will also idle rough when you are have the clutch in slowing down to stop. Once stopped, it goes back to a normal idle. I have replaced the wastegate valve, turbo boost solenoid and cleaned the mass air flow sensor. Any ideas would be appreciated.

Better to put this in the MK4 section but since you asked....

Diagnose it by reading the fault codes first. You may have replaced everything but the faulty parts.
I would look to see that the the turbo actuator moves freely. It is liable to be in a position where it is stuck or does not fully open.
The other problem is most likely related to too much fueling, A simple adjustment of the injection pump would be all it needs. (Hammer mod)
Both of these subjects will be covered in the list of How to section.


turbo repair -- if it is not the actuator alone jamming things up
http://forums.tdiclub.com/showthread.php?p=1340914
turbo actuator:
https://www.idparts.com/vane-actuato...alh-p-530.html

hammer mod -- you would need to have VCDS software to accurately adjust it. On older cars this might induce a fuel leak due to disturbing flattened gaskets. Have a gasket kit on hand.
http://forums.tdiclub.com/showthread.php?t=258297
gasket kit:
https://www.idparts.com/tdi-injectio...03-p-1143.html
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Old May 26th, 2019, 11:45   #302
Petesaguytdi
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Join Date: Jul 2006
Location: Edmonton. Alberta
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Number 1 issue to check first is if you have the cloth weave vacuum hose in use, check at the Turbo vane actuator unit where the hose has a tight bend,

you may find that the hose looks fine but the rubber has dried and cracked at that bend creating a slow leak.

That will often give you a limp mode issue on long sustained boost situations like a long hill climb.
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Old June 5th, 2019, 14:27   #303
drjarvis
Newbie
 
Join Date: Jun 2019
Location: Wv
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miss firing when driving 1.9 tdi
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Old June 9th, 2019, 07:08   #304
memphisride
Newbie
 
Join Date: Mar 2019
Location: Nova Scotia
TDI(s): 1.9 Beetle
Default

Quote:
Originally Posted by Petesaguytdi View Post
Number 1 issue to check first is if you have the cloth weave vacuum hose in use, check at the Turbo vane actuator unit where the hose has a tight bend,

you may find that the hose looks fine but the rubber has dried and cracked at that bend creating a slow leak.

That will often give you a limp mode issue on long sustained boost situations like a long hill climb.
Thank you for your reply. We are going to change all the vacuum lines next. There is only 158,000 KLMS on my bug. It has spent a fair time in storage.
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Old June 9th, 2019, 07:13   #305
memphisride
Newbie
 
Join Date: Mar 2019
Location: Nova Scotia
TDI(s): 1.9 Beetle
Default

Quote:
Originally Posted by JETaah View Post
Better to put this in the MK4 section but since you asked....

Diagnose it by reading the fault codes first. You may have replaced everything but the faulty parts.
I would look to see that the the turbo actuator moves freely. It is liable to be in a position where it is stuck or does not fully open.
The other problem is most likely related to too much fueling, A simple adjustment of the injection pump would be all it needs. (Hammer mod)
Both of these subjects will be covered in the list of How to section.


turbo repair -- if it is not the actuator alone jamming things up
http://forums.tdiclub.com/showthread.php?p=1340914
turbo actuator:
https://www.idparts.com/vane-actuato...alh-p-530.html

hammer mod -- you would need to have VCDS software to accurately adjust it. On older cars this might induce a fuel leak due to disturbing flattened gaskets. Have a gasket kit on hand.
http://forums.tdiclub.com/showthread.php?t=258297
gasket kit:
https://www.idparts.com/tdi-injectio...03-p-1143.html
Thank you for your reply. We are going to change the vacuum lines next. I will post the results.
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