Engine stutter after remap - FR TDi

[Haddock]

Hi,

Had a remap done yesterday and on the way home the car has developed a stutter/missfire which occurs under acceleration. This occurs under light or heavy throttle, and several times between 2k and 3.5k.

I'll leave the tuner un-named for the moment, they have been ok and want the car back on Saturday for diagnostics - but I will say they are one of the first tuners that springs to mind for VAG, and popular among the forum.

Just wondered if anyone else has had similar problems, or any suggestions for things I could check out - as its a fair journey back to them.

Regards

Chris

 

[Tam]

DPF becoming full, this means that the exhaust gas pressure is high as the flow rate through the DPF is lower, therefore turbo spool / wastgate closure has issues

When the DPF goes into regen it will clear itself out and the issue will go away until next time it fills up.

Get it quite often but generally in 5th or 6th from 2,000 RPM with full throttle acceleration.

 

[Haddock]

DPF becoming full, this means that the exhaust gas pressure is high as the flow rate through the DPF is lower, therefore turbo spool / wastgate closure has issues

When the DPF goes into regen it will clear itself out and the issue will go away until next time it fills up.

Get it quite often but generally in 5th or 6th from 2,000 RPM with full throttle acceleration.

Thanks for the reply,

This started after quite a bit of motorway driving though, and I do practically no driving in town? Ive never seen the DPF light, although I have had the deep noise on tickover a few times which I believe is part of the regen (although tickover was the normal 750rpm)

It doesent do it from Cold, but once warm does it almost constantly - and sometimes reduces power significantly throughout the rev range?

It can be any gear, and any RPM - so it may do it at 2000rpm, then again at 2500rpm, then 3000 etc etc..

Do you still think DPF?

 

[Haddock]

A couple of people have asked via PM who the company is, to be honest Id rather not say as the fault could be with the car and wouldnt want to put anyone off..

Will post the results on Sat...

Cheers

Chris

 

[Chan_P1_TDi_FR]

there has been another thread on the forum regarding a know throttle stutter from custom-code. It was most prominent on audi a4 2.0 tdi. Not sure if this is linked to the problem, but have a reach around the forum.

 

[UncleFester]

there has been another thread on the forum regarding a know throttle stutter from custom-code. It was most prominent on audi a4 2.0 tdi. Not sure if this is linked to the problem, but have a reach around the forum.

My Mk1 Cupra Tdi has always had a slight stutter post ( CC Ph1) remap, it's usually on light throttle and usually in 2nd or 3rd gear. It doesn't sound as noticeable as yours though.

 

[Daveb77]

Thanks for the reply,

This started after quite a bit of motorway driving though, and I do practically no driving in town? Ive never seen the DPF light, although I have had the deep noise on tickover a few times which I believe is part of the regen (although tickover was the normal 750rpm)

It doesent do it from Cold, but once warm does it almost constantly - and sometimes reduces power significantly throughout the rev range?

It can be any gear, and any RPM - so it may do it at 2000rpm, then again at 2500rpm, then 3000 etc etc..

Do you still think DPF?

I run a CCode Phase 1 remap (MK2 FR TDI) and I too, on occasion, get the same deep exhaust note on tick over (@ 750rpm). It sounds as if the exhaust is restricted in some way if that makes sense. Also appears to be running very warm at the exhaust. When this occurs I get a hesitation / jerky response when accelerating hard. This can all occur one to two times a week depending on miles driven. It then clears after a few miles and all is well. I have been putting it down to the DPF as discussed etc but have yet to see a DPF light come on (touch wood). I gather this only comes on when it is really blocked?

Im not too concerned as it clears as quick as it occurs and now accept it as a trait of the engine type. A point to note is that I never noticed this at all prior to my remap. Perhaps the extra soot from the harder working engine post remap is just exaggerating the effects...

Hope this garbled nonsense is of use.

D

 

[foxy367]

I run a CCode Phase 1 remap (MK2 FR TDI) and I too, on occasion, get the same deep exhaust note on tick over (@ 750rpm). It sounds as if the exhaust is restricted in some way if that makes sense. Also appears to be running very warm at the exhaust. When this occurs I get a hesitation / jerky response when accelerating hard. This can all occur one to two times a week depending on miles driven. It then clears after a few miles and all is well. I have been putting it down to the DPF as discussed etc but have yet to see a DPF light come on (touch wood). I gather this only comes on when it is really blocked?

Im not too concerned as it clears as quick as it occurs and now accept it as a trait of the engine type. A point to note is that I never noticed this at all prior to my remap. Perhaps the extra soot from the harder working engine post remap is just exaggerating the effects...

Hope this garbled nonsense is of use.

D

What you describe above is part of the DPF process whilst not being technical my understanding is there is some kind of valve which closes increasing the heat. You will only see the DPF light if this doesn't clear the system through. I have had it a few times irrespective of driving conditions (most of mine is motorway) but never seems to follow through to the full DPF light usually.

It has got much better though since I started using the Millers diesel supplement recommended by Spursmaddave

I am really interested in Saturday's result though as I am considering re-mapping mine. Hobin of Preston have a supplier in Blackpool (Evolution chips) which when carried out still remains under Seat warranty!

 

[johnbev]

Chris mine does the same since the ccode, I am undecided what to do I don`t want the code to be removed because when it does work properley it really does fly.
After much reading I am thinking that as mentioned above it does it towards the need of regeneration? My dpf light has never been on. Some days it just wont miss at all then another it will. Generally under hard throttle, in 3rd up to 6th. I think it does it in these gears more as hard throttle is only on in 1st/2nd for a few seconds before a need to change up, where as the others are for longer I have used shell fuels since new, it seemed to go better on vpower, but I have just started to use standard shell with millers. I am hoping that cleaner exhaust gases will reduce the xtra soot that the remap produces on hard throttle clogging the dpf, which at times may cause it to play up
Generally I don`t use hard throttle on my 22 mile commute, unless overtaking, so sometimes I think its cured........ till the next time

 

[Tam]

Thanks for the reply,

This started after quite a bit of motorway driving though, and I do practically no driving in town? Ive never seen the DPF light, although I have had the deep noise on tickover a few times which I believe is part of the regen (although tickover was the normal 750rpm)

It doesent do it from Cold, but once warm does it almost constantly - and sometimes reduces power significantly throughout the rev range?

It can be any gear, and any RPM - so it may do it at 2000rpm, then again at 2500rpm, then 3000 etc etc..

Do you still think DPF?

Yes, absolutely, drop the clutch and see where it's idling ... if its 1,000 rpm, then its trying to regen, drive at a constant speed with revs about 3,000 - 3,500 give it 10 mins or so like that as best you can, then drop the clutch again, if its still idling at 1,000 rpm turn it off and on again and it should settle down to 750rpm.. you'll then probably not experience the problem until next time its near full.

 

[Tam]

have a read of this thread too give some hints and tips as to how to handle a remap and dpf ... http://www.seatcupra.net/forums/showthread.php?t=184992

As i think i said in that thread, if i stick to exactly the same fuel, i dont normally experaince too many issues, today i had to switch to BP ultimate instead of shell v-power and twice already in 300 miles today i've had dpf regen... but then it'll settle down and be ok until i next switch fuels (i find shell v-power the best)

 

[Haddock]

Chris mine does the same since the ccode, I am undecided what to do I don`t want the code to be removed because when it does work properley it really does fly.
After much reading I am thinking that as mentioned above it does it towards the need of regeneration? My dpf light has never been on. Some days it just wont miss at all then another it will. Generally under hard throttle, in 3rd up to 6th. I think it does it in these gears more as hard throttle is only on in 1st/2nd for a few seconds before a need to change up, where as the others are for longer I have used shell fuels since new, it seemed to go better on vpower, but I have just started to use standard shell with millers. I am hoping that cleaner exhaust gases will reduce the xtra soot that the remap produces on hard throttle clogging the dpf, which at times may cause it to play up
Generally I don`t use hard throttle on my 22 mile commute, unless overtaking, so sometimes I think its cured........ till the next time

Hi,

Not sure how severe the "miss" is on your car, but on mine its very severe - to the point where I practically kangaroo passed when I overtake... Sounds like a very similar problem to mine though.. how long ago did you have it done?

 

[Haddock]

Yes, absolutely, drop the clutch and see where it's idling ... if its 1,000 rpm, then its trying to regen, drive at a constant speed with revs about 3,000 - 3,500 give it 10 mins or so like that as best you can, then drop the clutch again, if its still idling at 1,000 rpm turn it off and on again and it should settle down to 750rpm.. you'll then probably not experience the problem until next time its near full.

I'll try that in the morning, cheers... Ive a feeling it will be ticking over normally though, as Ive never seen it idle at anything other than 750/800rpm...

Chris

 

[DaveysFR]

I have a Superchips Bluefin on my FR TDI and I too get the regen mode more often accompanied by the stutter when accelerating.

I came to the conclusion that the extra soot is blocking the DPF quicker therefore the car is having to do a regen more often.

We should all write into watchdog regarding the amount of hastle we are having with the DPFs and see if they can pressure SEAT or VAG to come up with an alternative design and do a recall on all 170 tdi engined cars fitted with DPFs

Just a thought...

 

[Haddock]

Im not sure this is anything to do with the DPF, its almost every time I accelerate and the car wouldnt appear to be in regen (i.e. normal tickover, no deep exhaust note etc)..

Could be wrong though...

In a way im hoping its an air leak or a faulty sensor somewhere.

Chris

 

[Haddock]

Final Update...

Just back from JBS, and they test drove the car and witnessed the stuttering. When they put the car back to standard the stuttering stopped, however they were confident the problem was a failed sensor somwhere (pressure sensor in downpipe was mentioned as being a possibility).

Thankfully they gave me a full refund (which apparently isnt Custom Code policy if the fault is with the car) - thanks to Mike for sorting that.

I'll mention the fault at the dealers at the next service (unless it re-appears before), and hopefully they'll know which sensor is to blame.

Then in all probability it'll be back to JBS for a re-remap!

Cheers to people for the advice.

Chris

P.S. Apparently the DPF-OFF (Phase2) isnt too far off completion.

 

[red line fun]

i think i'll leave mine standard

 

[POWELLY]

Had mine to JBS today and had the CC map put on my FR170, car feels much better and pulls alot harder through all the gears

My drive home was 75 miles and i give it the beans and it never skipped a beat, i was a bit worried about having it done with all this going on above but as far as first impressions go it happy days from me

Big thanks to Mike and the boys there for squeezing me in .

 

[Chan_P1_TDi_FR]

i'm waiting for the dpf bypass, with dpf delete downpipe conversion to be fully reliable b4 i do anything to engine. currently getting 190bhp, so not worth getting remap just yet for me.

once it's available i'll be mapping my car.

 

[seremotors]

this reminds me of a thread i put on about a post-remap stutter. i had a hesitation at 3000, 3500 and 4000rpm in 4th and my remapper put it down to the car. i later found out another remap did the same and there is now a fix so i cant wait to get a run up for the 'new version'