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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 October 2nd, 2011, 07:10   #1
Brian_Spilsbury
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Join Date: Mar 2003
Location: Eden Mills, ON
Fuel Economy: 4.92 ltr/100
Default A new challenge. Power loss above 3000 rpm

I blow the carbon out most days on my trip home. It's a nice long stretch and I hard accelerate to 4000 rpm up to about 110 then back off to 80.
Yesterday, it ran as always up to 3000 but then it was like it fell on it's face. Still accelerated but with nowhere near the same power.
I have a Scan gauge set to display boost and it was showing between 180-200 which is normal for my car when it's running well. The ESP warning light came on.
backed off and it ran as well as always for my normal method of driving which is short shifting at 2k. Hit it again and the same thing.
This isn't limp mode, since it doesn't need a key off reset.
I'll check the manifold later today but the propblem has shown up from one day to the next.

Ideas?
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Old October 2nd, 2011, 07:20   #2
dadsdiesel
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I hardly ever drive my wife's NB, but when I did the other day it is doing just like you say (minus the ESP light).

No codes set. I haven't had the time yet to do any VCDS logging, but I am thinking that the intake may be clogged since it has never been cleaned.

I did teach her to WOT it once a day, but her version of WOT is going from 45 mph to 55 mph in 4th gear......

Like you say - it hits a wall at exactly 3000 rpm.
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Old October 2nd, 2011, 07:42   #3
Brian_Spilsbury
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and I have no codes, either. I would expect that like the last time my manifold needed cleaning, I would see pressure spikes on my boost gauge.
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Old October 3rd, 2011, 04:58   #4
Brian_Spilsbury
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any ideas? the manifold/egr looks good.
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Old October 3rd, 2011, 06:09   #5
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Unplug the MAF and see if power drops at 3k or if it keeps pulling.
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Old October 3rd, 2011, 14:31   #6
Brian_Spilsbury
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I'll try that on the way home. I'm starting to think I have a fuel issue. It's starting to sputter a bit under harder acceleration but seems smooth otherwise.
Back to looking at fuel lines for restrictions. I spent most tof the spring blowing them out to no avail.
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Old October 3rd, 2011, 14:39   #7
DanG144
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I would also look for fuel restrictions.
I would clean out the fuel pickup assembly, if you have not already done that.
Clean the tank.
Maybe drill out the cross piece in the fuel outlet pipe?
Replace the fuel filter?
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Old October 3rd, 2011, 14:45   #8
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I had a similar situation with my Jetta, above around 3000RPM. No codes, etc. but it was because of the small leak in my charge air hose. Not low enough boost to cause a code, but low enough to notice...
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Old October 3rd, 2011, 18:39   #9
Brian_Spilsbury
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DanG, I still can't help but think I have a fuel flow problem. I have cleaned the pickup out several times and drilled out the one way valve. Because of BIO, I have a bit of sediment but it has never been a problem in 4-5 yrs. Until now, I think.
The Mity Vac comes out the next sunny day, and I'll start putting suction on the fuel lines.
Even though our co-op filters the fuel at the pump, I expect I'm still getting some high temperature gelling at times
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Old October 6th, 2011, 05:19   #10
Brian_Spilsbury
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still no joy.
I have tested all the lines from the tank to the IP and no obstructions to fuel flow.
The filter is new.
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Old October 6th, 2011, 05:46   #11
Corsair
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Did you try unplugging the MAF ?
From logs, can you tell if the boost is remaining when the car falls on its face, or is the boost going away ? One possibility is a small vacuum leak that allows normal performance at low demand, but the vacuum reservoir becomes exhausted when asked to maintain high "pull" for extended time. Just a thought.
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