[lynchpeter]

Hi, My gttdi 110 is constantly going into limp mode, its fine when on back roads useing short bursts of acceleration but when overtaking a car at over 80k it goes to limp mode, have been to diagnostics and ellimaneted. the air flow meter, n75 and egr control, had all hoses presure tested also had turbo removed and losened up although it wasnt really sticky. Im now thinking that its possibaly feul related just changed fiter last week. Any help really apricated thanks

 

[Seatman]

I'd doubt it would be fuel related as it's the boost deviation that causes limp mode, the ecu sees that the signal isn't right so shuts off the turbo to prevent damage, if it was a fuel thing it wouldn't go into limp mode, it would just run bad. Did you get a fault code to say wether it was over boosting or underboosting or maybe even a dodgy reading from the map sensor? Here's a limp mode faq to look through, it's a different car but basically the same engine, just you have bigger injector nozzles and a slightly different map, see how you get on but I would replace all the vacuum lines as they're that cheap and easy to do

http://www.myturbodiesel.com/1000q/multi/limp-mode-TDI-fix.htm

welcometomyturbodies

 

[lynchpeter]

Thanks for your reply, ya had a look at that before, we replaced a few of the pipes also +sum look like they have been changed reciently. also tryed swoping map sensor with my friend as he has the same car, but to no avail. Ive heard it could be a crank angle sensor but i dont know if this is true. also is there anything else that i could check easly with my friends car. cud it be a problem with the ecu?
or the turbo even tho its free and seems the bo fine?

 

[lynchpeter]

forgot to say it didnt show any under or over boost on diagnostics

 

[chittychittybangbang]

Try this, when overtaking, does downshifting make any difference? It will put the engine at a different spot and see if the limp mode persists. Could be the CAS but it should have other symptoms so I would rule it out. Same w/ECU.

Take a look through the limp mode checklist and work through the possible causes, we can make some suggestions but without firm data from your end it's just guesses.

 

[lynchpeter]

Ive tried every gear and atitude of driveing it uasually hits limp mode when at around 2500 to 3000 thousand rpm. but if i accelerate really slowly its possible to get up to higer revs but it eventually goes. thanks for all the help will go through that list again but i think ive tried most things on it, thanks again!

 

[Euphratis]

My 2006 Passat goes into limp mode when I accelerate

Hi,

I am new to the forum world, and would appreciate any help or advice with regards to my ongoing issue. My 2006 2.0 tdi se Passat has suddenly started going into Limp Mode when I accelerate from 5th to 6th gear, and now it's even happening on 6th gear too. It seems to happen only when I am going up a an incline on the Motorway driving at 80-90 MPH. It also seems quite sluggish on 2nd and 3rd gear as well as hesitant when I suddenly want to pull off at times.

as soon as I get into limp mode I lose all power associated with the turbo, I pull up on the side off the road and switch off the engine which seems to re-set everything back to normal. I have read that it could be sticky vanes, MAF Sensor, Exhaust issue, and so on. I am just worried that this may cost a lot more than what it actually is, as most people are using atrial and error method rather than a quick fix to the problem.

Could someone help please. Really appreciate the help.

Euphratis

 

[chittychittybangbang]

Yes, you've found the limp mode reset. If you're fast (try this on an open road w/no traffic first), put the car in neutral and you can quickly flick the ignition-on and off, than put car back in gear.

Take a look at the limp mode troubleshooting FAQ article, it's pretty much impossible for us to guess an exact cause without some diagnosis on your part. Sticky vanes and vacuum lines are listed in the more common causes. If you want to really narrow it down you have to get a VCDS tool to see what the sensors are seeing. It's still cheaper than buying parts and throwing them at the car in an attempt to fix it.

 

[Euphratis]

Many thanks for your reply chittychittybangbang. I thought I might have to get a diagnostic check done to start narrowing things down. I will keep you all posted. I will try what you've suggested tomorrow when I am back from work.

Appreciate the help.

Euphratis

 

[powerknight]

I am currently diagnosing my own limp mode issue. Many of the vac lines have been rubbing but do not appear to have worn through yet. However the brake servo vacuum hose was cracked all to hades. Explains why my brakes were getting squishy. Repairing that did not solve the positive boost deviation. Doing a boost test tomorrow and going to mess around with the VNT actuator.

I was wondering if you should be able to move the VNT lever by hand with the car off and it still attached to actuator? Because right now it is solid. Hope it is not a dirty/worn turbo as that is a bunch more work for how much time I have this week

 

[Seatman]

Keep working it, it should move about an inch the way I've read it, sounds like yours is stuck which might well be the cause of your problems.

welcometomyturbodies

 

[sutherton1990]

check all the hoses for leaks check all relevent sensors and actuators (n75 common fault) if all fails prob turbo fault