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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIII-A3/B4 TDIs

VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old April 11th, 2018, 06:31   #16
jhax
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Alright, I'll start there then.
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Old November 28th, 2018, 13:15   #17
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Right, getting this one back up. I have since changed the fuel filter and replaced all old lines under the hood with tygon lines. I am still experiencing the same issue. Car hits about 2500rpm up hill, then backs off (no matter how far pedal is pressed) to 2000rpm. I notice when I do a hard pull on flat ground, I hit a point at about 3000rpm where the motor temporarily loses power but almost immediately pulls through past 3000. Could there be some sort of limp mode situation happening at those RPM? I don't get a check engine light or anything.
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Old November 29th, 2018, 02:33   #18
Abacus
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Fuel Economy: And the miles just keep ticking away
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I doubt limp mode is happening since, like Windex said, you'd have to cycle the key. Incidentally, I have hit limp mode and not set a code before but it always cleared with a key cycle.

You will need to log more than just the MAP, all that does is tell us what your turbo is doing, and it look like it's following requested as it should. It looks like you logged Group 011 already.

With the VCDS, grab logs of Groups when it's not performing correctly:

003:This will tell us if it's a Mass Air Flow and EGR issue
007: this will tell us your fuel and IAT temp, which will let us know if you have a misfueling issue due to a fault fuel temp sensor and if you have a boost leak in the charge air system that only shows up under load (and volume/pressure)
008: This will tell us if it's your fuel pump not delivering enough fuel
010: This will tell us if it's a charge air system pressure issue
015: This will tell us if it's your throttle position sensor
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'97 B4: 453,000 miles FOR SALE! Malone 3, PP520's, Stage 2 cam, SBC3, ARP studs, 2 1/4" exhaust, 2.5" Cat, no mufflers or EGR.
'96 B4V: 356,000 miles Malone 2+, PP520's, 6 speed, 02J short shifter, E-Codes, G60 brakes, Evo plate, DMF, stainless exhaust, heated leathers, cold weather package
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Old November 29th, 2018, 05:29   #19
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Man, I am so glad I have folks like yourselves for a knowledge base. Thank you! I'll see what I can grab in the weeks to come.
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Old March 18th, 2020, 14:25   #20
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I finally got around to getting logs of this. I did two separate pulls all grouped together.


Pull 1:
003



007



008



Second Pull:
008



010



015
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Old March 27th, 2020, 10:44   #21
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It looks like my MAF Actual is struggling to keep up with specified.
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Old March 27th, 2020, 15:53   #22
Abacus
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Your MAF looks fine. At lower rpms the EGR makes up the difference for the MAF, which is why it dips lower.

You have a split hose, split intercooler hard line, hole in the intercooler (or bad seams), or a bad clamp. I’ve had every one of those on various B4’s over the years. Your 010 log clearly shows the manifold pressure can’t hold despite everything else staying the same. It should not drop off like that under constant acceleration.

I doubt it’s the turbo of the MAF would show a similar trend, so it’s in the piping after the turbo.
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'97 B4: 453,000 miles FOR SALE! Malone 3, PP520's, Stage 2 cam, SBC3, ARP studs, 2 1/4" exhaust, 2.5" Cat, no mufflers or EGR.
'96 B4V: 356,000 miles Malone 2+, PP520's, 6 speed, 02J short shifter, E-Codes, G60 brakes, Evo plate, DMF, stainless exhaust, heated leathers, cold weather package
BUG*PWR 2013 Award Winner

Last edited by Abacus; March 27th, 2020 at 15:57.
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Old March 27th, 2020, 18:14   #23
Mongler98
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simple test, go get some plumbing fittings and plug the side that connects to the turbo, and do the same but with a valve stem on the other side right before the intake manifold. bring it up to 20 PSI. if it cant hold 20 PSI for a few minutes. if you cant keep 20 PSI for any amount of time then well, you have a leak. next fill that system up with water with some food colouring and a few drops of soap. put it back to 20psi and find out where the leak is if you cant find it when you were pressurizing. did this on my bosses cummins, turns out a seam had a crack in it from a rock strike up front on the IC. never would have found it, we knew there was a boost leak but could not find it for anything.
this worked.
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Old March 28th, 2020, 14:36   #24
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Thank you both. Ill check it out. Abacus, I no longer have an egr.
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Old March 28th, 2020, 20:39   #25
Abacus
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How is it deleted or bypassed, physically and electronically?
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'97 B4: 453,000 miles FOR SALE! Malone 3, PP520's, Stage 2 cam, SBC3, ARP studs, 2 1/4" exhaust, 2.5" Cat, no mufflers or EGR.
'96 B4V: 356,000 miles Malone 2+, PP520's, 6 speed, 02J short shifter, E-Codes, G60 brakes, Evo plate, DMF, stainless exhaust, heated leathers, cold weather package
BUG*PWR 2013 Award Winner
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Old March 29th, 2020, 12:15   #26
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I have a blockoff plate. I dont think I did anything to set the value for egr in VCDS although I would have to look.
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Old March 29th, 2020, 15:21   #27
Abacus
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Then your car is trying to adjust for an active EGR by moving timing & fuel but nothing matches up right. This is why a tune is needed to delete the EGR.
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'97 B4: 453,000 miles FOR SALE! Malone 3, PP520's, Stage 2 cam, SBC3, ARP studs, 2 1/4" exhaust, 2.5" Cat, no mufflers or EGR.
'96 B4V: 356,000 miles Malone 2+, PP520's, 6 speed, 02J short shifter, E-Codes, G60 brakes, Evo plate, DMF, stainless exhaust, heated leathers, cold weather package
BUG*PWR 2013 Award Winner
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Old March 29th, 2020, 15:57   #28
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For a 1z motor? I was under the assumption that the value could be changed in VCDS and that was it.
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Old March 29th, 2020, 19:33   #29
Abacus
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Fuel Economy: And the miles just keep ticking away
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No, it can be turned down, but not off. For that you need a tune.
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'97 B4: 453,000 miles FOR SALE! Malone 3, PP520's, Stage 2 cam, SBC3, ARP studs, 2 1/4" exhaust, 2.5" Cat, no mufflers or EGR.
'96 B4V: 356,000 miles Malone 2+, PP520's, 6 speed, 02J short shifter, E-Codes, G60 brakes, Evo plate, DMF, stainless exhaust, heated leathers, cold weather package
BUG*PWR 2013 Award Winner
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Old March 30th, 2020, 05:44   #30
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I understand, thank you again. Im lucky enough to still have a job in these times, however our schedule is now 7 12 hour days on 7 days off so next week the passat will get some much needed attention.
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