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VW MKV-A5 Golf/Jettas Discussions area for A5/MkV Jetta/Golf (2005/2006 PD and 2009 CR).

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Old October 1st, 2019, 22:02   #1
Veteran Member
Default Still having intermittent stalling and "power resistance"

Sorry for the vague terminology--I can't think of how else to describe how the car feels when I drive it, except: it kind of feels like it's having to work too hard to get the engine to run. My latest hypothesis: if the exhaust flow is partially clogged somewhere, I assume the back-pressure would make the engine have to work harder than usual to attain the same power, but might this also explain the occasional stalling/"cycle skipping"?

Previous related thread: http://forums.tdiclub.com/showpost.p...60&postcount=1

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Old October 2nd, 2019, 21:36   #2
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Join Date: Dec 2013
Location: San Antonio, TX

You are probably suffering from a couple of different issues. Yes, diesels are extremely picky and temperamental about the fuel you put in and its quality. Having a clogged filter will definitely kill performance. You want to start with the simple things and see where they take you. Have you checked your car for codes with a Vagcom or specialized scan tool? You could be having some issues that it is already telling you to fix. Before you start replacing more and more expensive and complicated things, if you don't have access to a scanner then a good thorough service might help remedy a few of the symptoms.

Forgot to add that yes, our TDIs have a fuel filter in the engine bay, passenger side by the headlight, round canister. Before buying a new filter verify if you have an older style filter or newer one, easy to check....

Last edited by mextdi; October 2nd, 2019 at 21:41.
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Old October 3rd, 2019, 12:58   #3
Join Date: Sep 2005
Location: Spicewood, Tx.
Fuel Economy: 49.3, 48, 21.2,19.99

Anytime I am trying to do some serious troubleshooting I start with the maintenance and filters. Before TS please replace air filter and diesel fuel filter, then while you are under there give the intake tract/piping a once over visual.

An intake leak can cause stalls/surges. A clogged convertor can cause what you describe.

However..Take the easy/lazy/least economic way out and change filters first.

This usually solves 90% of the problems. FF can 'hold' the engine back feeling and lost of power.

If this is good, I will help you TS the rest.

Mine right now feels this way, I know I have a serious exhaust leak from the EGR cooler shaft, which I am loosing drive pressure to the turbo and loosing boost, which gives me the feeling something is holding the car back from accelerating. You might check this if you don't have the mod or bought an EGR cooler lately.
2018 F150 3.5 ECO 3.55 10spd 20s 2tone 26mpg 2turb
2006.5 DE DSG, RC2, Sunroof, 200K miles, 61MPG best
2005.5 Jetta-5 SP LSD Spec S2 130K ELF506 10-30W OCI=20k ORIGINAL CAM RSB Diesel custom 2.5DP/3" SS Pkg 1 Auto-dim mirror auto-WW auto-climate 248tq=150HP RC2 lowered 312 brakes

Last edited by Mach1; October 3rd, 2019 at 13:03.
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Old October 5th, 2019, 16:28   #4
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I replaced the air filter less than 5000mi ago (and have checked it repeatedly throughout working this problem), and the fuel filter less than 500mi. ago (if you visit my other recent threads you'll see that I've been struggling w/ this for a while).
I redid the tank pump test and got zero flow, so that's clearly suspect #1 at this point; just to be sure, I checked the voltage across these slots:

[Pic of tank pump electrical relay--indicating slots across which I measured 2.24V--supposed to be here, but it's not appearing in my gallery after reportedly uploading it successfully, so: the wide slot closest to the round side of the relay and the middle, narrow slot]

and got 2.24V: can anyone confirm that that's what it should be? Thanks!

Last edited by dgoldsmith; October 5th, 2019 at 16:29. Reason: add a phrase
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