sudden loss of power @ 70

[ando]

I was on the start of the motorway yesterday, I was going about 70 and on full throttle in 4th gear. All of a sudden the car stopped accelerating and from then on I had no acceleration in any gear, it was as if the turbo was not kicking in at all.

I pulled over and disconnected the MAF, blew on the connections and then reconnected it and after starting the car back up, it was fine. Its been over 24hrs and 60 miles since the problem happened and the cars been fine. Could this be the first signs of the MAF dieing? or could it be something else?

BTW, she's a remapped Tdi 110

 

[micky 32]

it sounds like limp mode. Your turbo may have overboosted. Switching the car on and off makes it come back to normal. Get someone with vagcom to see what it says.

 

[basstard]

yes, IMHO it ain't the maf at all,,, you just turned off the mofo and then on again and the limp mode was resetted back to normal,,, scan the fault memory.

 

[slimjim]

Do you have a boost valve?

You shouldnt really run remapped without a boost valve....

 

[basstard]

let's say you'd better have one.
I still have to find out if they do one for the VNT turbos, mojogoes told me yes but I went on their site and there was nothing,,, but then again their site is crap,,,

 

[slimjim]

Well it's been 6 months since mine was chipped..... Think I might ask for one from Father Christmas

 

[ando]

Do you have a boost valve?

You shouldnt really run remapped without a boost valve....

This is the first I've heard of a boost valve, what does it do?

 

[slimjim]

I said valve ... when I "obviously" meant gauge .....

 

[basstard]

ah,,, ok, if you were talking bout boost gauges then the need is much lesser since you got vagcom,,,

ando, take a look at their site: www.boostvalve.com

 

[sssstew]

agreed, sounds like a boost into limp mode problem.

You will need VAG COM to troubleshoot further.

 

[cheshire cat]

This is the first I've heard of a boost valve, what does it do?

allow's you to put a limit on the amount of boost generated so avoiding limp mode

 

[basstard]

Nic, nice to hear from you again, where ya been?

Do you know if there's a VNT version of the thing?

 

[prc]

allow's you to put a limit on the amount of boost generated so avoiding limp mode

That should be done by the remap and not a boost valve.

From the symptoms what's probably happening in Ando's case is that boost is slowly but surely creaping up past requested and triggering limp mode when the boost hits 0.3bar over requested. It'a a common remap problem.

 

[cheshire cat]

That should be done by the remap and not a boost valve.

From the symptoms what's probably happening in Ando's case is that boost is slowly but surely creaping up past requested and triggering limp mode when the boost hits 0.3bar over requested. It'a a common remap problem.

"yes but, ahh but" without any spikes? is any remap that good??

 

[prc]

no map, not even the original will control overboost spikes.

none of the maps I've run has ever caused any problems so yes they should in fact control boost. If the boost tables and torque limiting tables are set up correctly, you will not have problems.

 

[ALEX**]

could also be the brake sensor when mine went faulty i had the same syptoms as limp mode ie no acceleration but it was because the ecu thought i was braking and cut all throttle so i cpould not accelerate

 

[slimjim]

could also be the brake sensor when mine went faulty i had the same syptoms as limp mode ie no acceleration but it was because the ecu thought i was braking and cut all throttle so i cpould not accelerate

That REALLY pisses me off ..... no left foot braking