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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 November 8th, 2019, 20:25   #1
jptbay
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Default Quick BEW limp like pointers

Went into limp like state right away after starting when I left to drive home this morning after nightshift. Tried a dozen or so restarts on the way home, but would not resolve.

Was acting similarly this spring and I deleted the EGR by going to PD150 intake manifold and retaining the ASV. Seemed to resolve issue and have had no trouble for 6 months.

No codes. Checked vnt operation with VCDS, all good. Changed fuel filter, went for a ride and back to normal, full power. There are no boost leaks. Have doggie collar, vnt17 and upgraded intercooler. Went to bed.

Left for work tonight, car had full power. Was snowing so I was driving easy. Went into limp like state again sometime while I was putting around on a city street. Stopped at a light and was limped out.

Some ideas for things to check?

No codes is annoying. Thinking fuel. New VW lift pump last winter, seems to be working good. Car has about 335ooo km. Still on original tandem pump, but I have a new one on hand. Put in new Bosch MAF this spring too when I did the manifold.
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2003 Beetle, 18/56, 3 Bar MAP, 11mm pump, Bosio R520's, Cat fuel filter, PD lift pump, Kerma OMI, Kerma tune, IDParts lower boost pipe, Tyrolsport SMIC, Turbo S fender liner, PD150 intake w/racepipe, IDParts 2.5" stainless downpipe & 2.5" straight exhaust, ARP headstuds, ASV Pistons, I.E. I-Beam rods, BFI stage 1 mounts, Spec stage 3+ clutch/18lb flywheel, R axles, VR6 spindles, GLI big brakes F&R, 17" Enkei RPF1's, Koni FSD's, Evolution skid plate, McNally 30 PSI boost/EGT gauge, OEM HID's ...
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Old November 8th, 2019, 23:19   #2
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Thinking about it more, I checked and forgot that BEW and ALH MAF's are different. Been working fine until now, but maybe with colder weather it is out of range.

I'm going to try unplugging it in the morning and see what happens with a default value.
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2003 Beetle, 18/56, 3 Bar MAP, 11mm pump, Bosio R520's, Cat fuel filter, PD lift pump, Kerma OMI, Kerma tune, IDParts lower boost pipe, Tyrolsport SMIC, Turbo S fender liner, PD150 intake w/racepipe, IDParts 2.5" stainless downpipe & 2.5" straight exhaust, ARP headstuds, ASV Pistons, I.E. I-Beam rods, BFI stage 1 mounts, Spec stage 3+ clutch/18lb flywheel, R axles, VR6 spindles, GLI big brakes F&R, 17" Enkei RPF1's, Koni FSD's, Evolution skid plate, McNally 30 PSI boost/EGT gauge, OEM HID's ...
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Old November 9th, 2019, 06:40   #3
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Well that was a slow ride home...

Unplugged the MAF and no improvement. I ordered a new one so it would be correct. Going to have to dig some more when I have time.
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2003 Beetle, 18/56, 3 Bar MAP, 11mm pump, Bosio R520's, Cat fuel filter, PD lift pump, Kerma OMI, Kerma tune, IDParts lower boost pipe, Tyrolsport SMIC, Turbo S fender liner, PD150 intake w/racepipe, IDParts 2.5" stainless downpipe & 2.5" straight exhaust, ARP headstuds, ASV Pistons, I.E. I-Beam rods, BFI stage 1 mounts, Spec stage 3+ clutch/18lb flywheel, R axles, VR6 spindles, GLI big brakes F&R, 17" Enkei RPF1's, Koni FSD's, Evolution skid plate, McNally 30 PSI boost/EGT gauge, OEM HID's ...
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Old November 9th, 2019, 08:46   #4
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Does no boost leaks include the IC connections down under?
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Old November 9th, 2019, 15:15   #5
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Quote:
Originally Posted by JB05 View Post
Does no boost leaks include the IC connections down under?
Yes. Took a good look. I changed the oil when I changed the fuel filter and had the car up in the air with the skid plate off. When I installed the upgraded SMIC I swapped all the lower boost pipes to ALH ones.

Further, if there where boost leaks I would expect a code for deviation from requested.

Been reading a lot of old threads and there seem to be a few things to look at. I am going to more thoroughly check the N75 and turbo, as well as change the tandem pump that I have been meaning to get to for a while because of a leak.

Welcome other avenues look at too. Don't be shy, throw out your ideas please.

Don't think it could be the cat plugged, due to the intermittent nature of this issue.
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2003 Beetle, 18/56, 3 Bar MAP, 11mm pump, Bosio R520's, Cat fuel filter, PD lift pump, Kerma OMI, Kerma tune, IDParts lower boost pipe, Tyrolsport SMIC, Turbo S fender liner, PD150 intake w/racepipe, IDParts 2.5" stainless downpipe & 2.5" straight exhaust, ARP headstuds, ASV Pistons, I.E. I-Beam rods, BFI stage 1 mounts, Spec stage 3+ clutch/18lb flywheel, R axles, VR6 spindles, GLI big brakes F&R, 17" Enkei RPF1's, Koni FSD's, Evolution skid plate, McNally 30 PSI boost/EGT gauge, OEM HID's ...
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Old November 11th, 2019, 06:30   #6
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So it wasn't the tandem pump. At least it won't be leaking any more.

Will look at it more tonight.
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Old November 11th, 2019, 15:41   #7
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Quote:
Originally Posted by jptbay View Post
Further, if there where boost leaks I would expect a code for deviation from requested.
If it looses power while you are driving (limp mode) you have to scan for the code before you shut the car off.
It self resets when the ignition shuts off.
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Old November 11th, 2019, 16:41   #8
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Quote:
Originally Posted by wonneber View Post
If it looses power while you are driving (limp mode) you have to scan for the code before you shut the car off.
It self resets when the ignition shuts off.
No, you don't. Limp mode resets when the ignition is cycled but any stored code remains until cleared with a scan tool.

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Old November 11th, 2019, 17:32   #9
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No time tonight unfortunately to look at it, but appreciate any brainstorming ideas.
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2003 Beetle, 18/56, 3 Bar MAP, 11mm pump, Bosio R520's, Cat fuel filter, PD lift pump, Kerma OMI, Kerma tune, IDParts lower boost pipe, Tyrolsport SMIC, Turbo S fender liner, PD150 intake w/racepipe, IDParts 2.5" stainless downpipe & 2.5" straight exhaust, ARP headstuds, ASV Pistons, I.E. I-Beam rods, BFI stage 1 mounts, Spec stage 3+ clutch/18lb flywheel, R axles, VR6 spindles, GLI big brakes F&R, 17" Enkei RPF1's, Koni FSD's, Evolution skid plate, McNally 30 PSI boost/EGT gauge, OEM HID's ...
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Old November 12th, 2019, 08:04   #10
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Checked a bunch of things this morning and it looks like my three bar map is the issue.
Click on thumbnails for larger picture.
In measuring blocks in VCDS, both idling and engine off, boost is showing 2196 mbar. When engine off specified is supposed to be 192. Idling specified is just over 1000.
Also group 22 shows charge pressure system malfunction.
Funny how no fault codes were logged.
Ignore the MAF readings. It's not working because as I previously mentioned it's the wrong one, and clearly not working, so a new proper BEW one is on it's way.
Going to order up a new map and see what happens.

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2003 Beetle, 18/56, 3 Bar MAP, 11mm pump, Bosio R520's, Cat fuel filter, PD lift pump, Kerma OMI, Kerma tune, IDParts lower boost pipe, Tyrolsport SMIC, Turbo S fender liner, PD150 intake w/racepipe, IDParts 2.5" stainless downpipe & 2.5" straight exhaust, ARP headstuds, ASV Pistons, I.E. I-Beam rods, BFI stage 1 mounts, Spec stage 3+ clutch/18lb flywheel, R axles, VR6 spindles, GLI big brakes F&R, 17" Enkei RPF1's, Koni FSD's, Evolution skid plate, McNally 30 PSI boost/EGT gauge, OEM HID's ...
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Old November 16th, 2019, 15:43   #11
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MAP sensor ended up being faulty.

Pretty happy car again. Got some love with the proper MAF finally, no more leaking tandem pump, and got the winter tires on.
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Old November 18th, 2019, 08:15   #12
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Glad you resolved it and posted the fix.
It may help others down the road.
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