Hey all,

 

Friend of mine has a vrs tdi which seems to have a few issues. The car idles high quite often (circa 1000rpm) and lacks power in the rev range (Almost hits a brick wall at 4000 rpm). I assume the high idle may be something to do with the DPF doing a regen as it doesn't always idle this high. However, it seems to be a very regular occurrence now. The car also makes a rattling noise whilst this high RPM stage is happening which I am clueless as to the cause.

 

A work colleague used to have a VRS tdi and hers would run the cooling fans pretty fast when (I think)  the car was doing a regen, but they don't seem to spin up on this one at all?

 

The previous owner had the car remapped and looking at the dyno graph I'm unsure why it was allowed to leave the place as the power and torque take a massive dive at around 3800rpm until 4200 and then rise back up before finally tailing off.

 

Can anyone offer any suggestions? He's going to contact the place of tuning tomorrow to see if he can get the standard map put back on.

It's a diesel, to be frank you don't won't to be up at 4000 rpm as there is no power up there. I find changing about 3500/3800 is far as you need to go. Un like a petrol you don't won't to be ringing it's neck at the redline. As for DPF, take the car for a run at 60mph and don't come out of 4th for about 15/20 mins.

It's a diesel, to be frank you don't won't to be up at 4000 rpm as there is no power up there. I find changing about 3500/3800 is far as you need to go. Un like a petrol you don't won't to be ringing it's neck at the redline. As for DPF, take the car for a run at 60mph and don't come out of 4th for about 15/20 mins.

 

The car intermittently runs out of power before 4k or seems to hesitate and then carry on. The dyno chart shows the massive tail off I detailed(starting around 3600 rpm), before power climbs again from a 'low' of 130hp at 4100rpm back up to 200hp again by 4500rpm?

Edited 16 August, 201510 yr by -mike-

I would take the car to a performance garage like shark.

The ecu is probably pulling the fuelling back at high RPM due to high EGT readings, when mine was being mapped on a rolling road he had to tweak the map a couple of times and tone it down from the most aggressive one he tried because of this.

The ecu is probably pulling the fuelling back at high RPM due to high EGT readings, when mine was being mapped on a rolling road he had to tweak the map a couple of times and tone it down from the most aggressive one he tried because of this.

 

I wondered this myself. The car has now thrown up a DPF light so I assume its not happy / the original is tired. Car has done 150k so its probably overdue a removal new one! The map doesn't seem all that great with boost inconsistencies all over the rev range. Some acceleration runs it'll make decent boost low down, while others it won't make anything pretty much until 2500 rpm.

Could be possible, if the car is trying to regen it will be purposely putting more fuel in to hit the high temps needed to do the regen, but then if you give it some shoe the temps will be going too high causing the car to pull the fuelling back to try and bring them back down.

I mean that's just me making a bit of a guess but it certainly sounds like one of those pain in the arse things to find otherwise :S

Thought I'd update this :

 

He got the map removed, but got them to leave the EGR delete part there as Skoda advised EGR valve noisy when the previous owner took it in to be serviced. This in itself seems to be a massive problem which I'll get to in a minute -

 

Couple of days later the DPF light came on, and even with VCDS we couldn't get it to do a standing regen despite all the values being within acceptable limits. Plugged the EGR valve back in (which the mappers had left disconnected) and the car managed to complete a standing regen. From what I've read on darkside the EGR should not be deleted while the DPF is still present (physically and in the map) so I'm assuming this may be a big issue? However, post leaving the EGR valve connected the car drove with no acceleration at all - no boost looking at vcds logs. Once the connecter was removed again the car drove better than it ever has since he's owned it. This in itself may be a problem as I believe the EGR wants to see some sort of reading from the EGR to allow a regen to happen.

 

If anyone can offer any advice that'd be great - I just told him to take it to someone who knows what they are doing with regards to maps (perhaps darkside or shark?)

 

Thanks