Manifold Vacuum Actuator...Car is now repaired!

[LukeFR]

Well mine has just been replaced and I'm afraid to say it hasn't corrected my issue, although car does feel a tiny bit better with the new actuator on it but I must have other issues.

Basically when at say 2k revs in 5th, put foot down nothing happens and chucks up this fault. The car seems to be underboosting to me as it's not kicking in as before.

Any ideas? I don't want to be throwing money at it anymore.

 

[Rosskie]

Dpf
Dpf sensors
N75
Sticky turbo vanes
Sticky egr
Boost leak - check hoses near intercooler

Thats the stuff i've got listed as possibilities for my similar issues.

Sorry to hear it didn't fix it for you. Very annoying when you think you've got it sussed.

Purely out of interest, try unplugging the maf and see if it still happens. Mine runs fine with maf out, but a new one didn't cure

 

[LukeFR]

Thanks mate.

Is the MAF sensor on the airbox pipes?

 

[slepy]

Mine is a bit better because it doesnt cut off like used to, but now it feels like doesnt have enough boost near 2krpm and still a bit juddery. Will fit new n75 tomorrow but not counting chickens that it will help.

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[slepy]

Im still thinking that it is related somehow to dpf but dont fancy spending cash on sensors just to check

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[Rosskie]

Yeah, mafs between airbox and engine. Can't miss it.

I do think dpf has a lot to answer for, and ripping it out is high on my list, but its an expensive diagnostic test. And then if it's wrong running more power on an unhealthy car can't be good

 

[slepy]

Yeah had the same idea but would we see boost related error if it was something with dpf sensors? Paying over 700 quid and then finding out it is even worse would not be a great thing.

Do you know if it's a bumper off job to check intercooler pipes?

I've read somewhere that if you disconnect maf and it runs fine it doesn't mean that maf is screwed.

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[LukeFR]

I unplugged the MAF and I just got glow plug light constantly, just seemed to run same but suppose I could unplug and try to make the car go into limp mode again. Good idea?

I don't think this is DPF issue personally. My boost isn't kicking in where it should and you have to over rev it sometimes to get it going, when you go into a high gear at low rev it doesn't look it and you have to change down

 

[Rosskie]

Yeah, i read unplugging maf affects lots of things and isn't necessarily a indicative of a fauly maf. Certainly wasn't for me and a new bosch maf wasn't cheap. It must give a clue to where the problem really lies tho.

Probably don't mess about with your maf too much luke, esp since it doesn't give a clear answer, i was just wondering.

As for dpf i did read somewhere that a dodgy dpf can cause a p0299, something to do with pressures, sorry i can't be more specific.

If you google p0299 first hit is a large thread on tdiclub. Relates to passats, but interesting

 

[slepy]

Guys. Ive changed N75 to new one today and the car was undrivable. It's like there was no turbo. Didnt rev anything higher than 1200 rpm switched it back to old one and it boosts fine again just with a bit of judder. Bloody frustrated now. Does new N75 need adopting/coding with vag com? Dont get why it would get worse with it.

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[LukeFR]

Well now have engine management light too!

Dunno what to do

 

[Rosskie]

Hate to say it, but maybe go to stealer? This forums great, but i don't think anyone knows for sure whats going on with these cars. Plenty people had similar things happening it the past, with few answers. Also its something more acute with yours luke, i know mines a chronic problem so can be put up with...


Slepy: Think you need to get under car for the intercooler hose check.

As for n75 maybe check if it has an adjustable position or something, compare it to the old one? Doubt it needs to be coded, but don't know for sure... Probably silly question, but you sure you connected it up properly? Didn't you have it the new one on before? I'd think the new one is broken

 

[LukeFR]

It's going in next week, only thing left now. Took a risk of the manifold, wasn't that and now even worse to drive. Even less boost. Fingers crossed its a hose/sensor/egr rather than the Turbo

 

[slepy]

Rosskie. Yeah I had it on my car already and everything was fine for about 2 hours drive. After that it started running like a pig. I thought that it was due to egr bolt being loose but looks like n75 caused it. Im 100% sure I connected it fine. Strange thing I've noticed is that when I disconnect the thinnest,bottom hose from new n75 there is air going "pssst" as in pressure builds up. Dont have that with old N75. Yes, I will be looking at the ic pipes next week. Is it bumper off thing? Will also scan it in the morning to see if I have any new errors related to n75.

Luke you sure you heve put all well toghether? All gaskets in? Mine runs a lot better than before actuator change. No cutting off in 1st gear.

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[LukeFR]

Looks like I got EGR valve issues according to vagcom. Will report details in a little while, but it states excessive flow so presume flap is stuck open

 

[LukeFR]

EGR Fault Code


001026 - EGR System
P0402 - 006 - Excessive Flow - Intermittent
Freeze Frame:
Fault Status: 00000001
Fault Priority: 1
Fault Frequency: 1
Reset counter: 40
Mileage: 100980 km
Time Indication: 0
Date: 2000.00.00
Time: 14:46:44

Freeze Frame:
RPM: 2016 /min
Torque: 144.0 Nm
Speed: 69.0 km/h
0.00 %
95.55 %
Mass Air / Rev.: 621.3 mg/str
Mass Air / Rev.: 479.6 mg/str

 

[slepy]

You sure that the plugs are in properly?

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[LukeFR]

I think so mate yes, why you thinking that could be it?

 

[slepy]

If you just cleaned EGR it would be a bit of a coincidence that it gets stuck now? Did you have EGR error before? Also if it was sticking I assume fault frequency would be more than 1.
Did you change all the gaskets to new ones after taking it out?
I just scanned mine and there is no fault since I changed the actuator on Saturday.
Tomorrow morning getting the bumper off before I go to work to see the IC pipes.
I just don't get why I have no boost at all when I change N75 to new one.
What is the chance that new N75 is screwed?

 

[Rosskie]

I don't think you need bumper off for IC, I'd guess just belly pan.

Seems unlikely that new n75 is screwed, but don't see any other explaination, and the hissing surely isn't right... Is it a revised part?

Dunno about your egr, but i'd suspect loose connection / leaking gasket. Or maybe the cleaning damaged something?