Hello

I would like to know what problems I might face if I try to reset all adaptation values from Select -> Engine -> Basic Settings. The message after clicking Go! is rather scary. Please see photos below.

I am working on a 1.4 TSI CAXA engine.

 

When resetting some modules, they can lose the parameterisation so you'll end with a "no end of line programming" fault or similar. To "fix" it, you'll need a dealer to re-parameterise the module as it's not some VCDS can do. However, VCP might be able to do some modules...

 

I've no idea if it applies to that specific ECU but I certainly wouldn't be trying it without confirmation from rosstech or someone that's tried it on the same ECU.

 

What are you trying to achieve?

Thank you for reply. I am trying to reset all learned values of LTFT. There is a stubborn negative (around -10%) LTFT at idle situation that goes around 0% only under load. I did a hard reset (no battery for over 30 minutes) with no success. There is no CEL, the car runs apparently fine, maybe some minor misfires at idle (felt by hand) that I couldn't catch on VCDS. I've tested for the two obvious reasons: excessive fuel or lack of air. So far I've changed the air filter and spark plugs as they had to be replaced anyway according to VAG service program. The fuel pressure is fine. The car has almost 50,000 km . It is maintained very well. Has fresh engine oil.

 

I have logged a trip and shared it for review at https://datazap.me/u/ricardom/log-1587932366?log=0&data=4-7-8-10

I would appreciate if you could have a look at it.

It is an interactive graph as you can add various parameters by clicking on them.

I'm thinking next to use a borescope to see how much carbon deposits there are on the intake valves.

I've been told by a technician that I need to check further for: a leaky injector, fuel in oil, and a slightly bad COP. It will be tricky as I don't have the right tools.

Just to be clear to me, is the reset of all adaptation values the same thing as reset all LTFT learned values?

https://www.adamlewin.co.uk/vw-mk5-golf-tsi-engine-timing-chain-problem

 

 

 

Edited 28 April, 20206 yr by Roottootemblowinootsoot

Just now, Roottootemblowinootsoot said:

http://adamlewin.co.uk/vw-mk5-golf-tsi-engine-timing-chain-problems

 

 

Correct link: http://www.adamlewin.co.uk/vw-mk5-golf-tsi-engine-timing-chain-problem/

 

As for the adaptions, I'm not sure. Have you asked rosstech for advice?

2 hours ago, Roottootemblowinootsoot said:

https://www.adamlewin.co.uk/vw-mk5-golf-tsi-engine-timing-chain-problem

I don't see anything in that article related to the issue of my car. Those car run horrible, worse than a tractor. The car I'm working on is from 2015, no service bulletins applicable to it.

The only things that puzzle me can be resumed in two questions:

1. Why is the LTFT negative (-10%) at idle yet corrects itself immediately with load. At 38% load the LTFT is perfectly 0%.
2. Why is the LTFT react so quickly? It is as quick as the STFT. From my knowledge, it takes a while (seconds, if not tens of seconds) till the LTFT catches on.

Edited 28 April, 20206 yr by RicardoM

@RicardoMLucky you then, a 1.4 TSI CAXA without faults.  No bore wash or excessive oil use, no poor software installed.

1 minute ago, Roottootemblowinootsoot said:

No bore wash or excessive oil use, no poor software installed.

Could you point me to a relevant topic/article describing those claims for a 2015 or newer CAXA engine ?

4 hours ago, RicardoM said:

Just to be clear to me, is the reset of all adaptation values the same thing as reset all LTFT learned values?

You'll need to ask Ross-Tech, on some modules "reset all values" does much more than that and clears saved calibration values making the module incapable of functioning correctly.

 

@RicardoM

2015 was still a Euro 5 emissions.   I am claiming nothing just saying what can be a common issue still in 2015.

 

As you usually tell others, do your own research,

or just dismiss my ramblings.

 

Edited 28 April, 20206 yr by Roottootemblowinootsoot

3 minutes ago, Roottootemblowinootsoot said:

As you usually tell others, do your own research,

or just dismiss my ramblings.

I thought you have ready available proof to your claims since you look very sure, almost to the point it is common knowledge. But based on your strange reply, I will dismiss them as ramblings.

No claims, just experience of the issues.  They were so good engines that VW had to change them. 

Might be worth asking someone with the same engine to log their fuel trims so you can compare?

Will do that. Hopefully the list of cars that have the CAXA engine is good enough and I will be able to compare the values.

 

6 hours ago, langers2k said:

As for the adaptions, I'm not sure. Have you asked rosstech for advice?

I am sorry for asking and please don't get me wrong but are there any certified auto technicians in this forum? My level of expertise is very high on Skoda Felicia and I advice fellow members from mechanical issues to reverse engineering the dashboard. So I am guessing that maybe I can count on VAG technicians that browse this section often.

@Tech1e  might have some ideas?

 

18 hours ago, RicardoM said:

I am sorry for asking and please don't get me wrong but are there any certified auto technicians in this forum? My level of expertise is very high on Skoda Felicia and I advice fellow members from mechanical issues to reverse engineering the dashboard. So I am guessing that maybe I can count on VAG technicians that browse this section often.

Why are you apparently so unwilling to ask Ross-Tech?

 

Many more VAG technicians are regular contributors on their forum than on here...

2 hours ago, PetrolDave said:

Why are you apparently so unwilling to ask Ross-Tech?

It is not that I am unwilling but I have a HEX-V2 clone...

14 hours ago, RicardoM said:

It is not that I am unwilling but I have a HEX-V2 clone...

Naughty boy!!! So you would quickly get your status on the Ross-Tech forum changed to "Pirate"!

Well, nobody is perfect. The one who is to pick up the stone...

1 hour ago, RicardoM said:

Well, nobody is perfect. The one who is to pick up the stone...

I've owned a genuine VCDS cable since 2004 (first a HEX-CAN and now a HEX-NET) so stones can't hurt that window of mine 😙

I was speaking in general, on all aspects of personal life.

So back to topic.

I will delete for a short while the PVC system to see if some fuel vapors have been altered all this time the LTFT values.

Then I will use some "snake oil" formula additive for cleaning the injectors.

Then I will have a peak at intake valves using a borescope (although at less than 50,000 km I don't expect much)

In fact, my intuition tells me there is an air restriction at idle rather than a fuel excess.

Edited 30 April, 20206 yr by RicardoM

The problem has been fixed.

The moment I removed the PCV tube from the crankcase, LTFT started to get closer and closer to 0%. Slight oscilations at idle but total trim is around 0%.

I was expecting that if I put back the PCV tube, the LTFT will become negative again. But for some very strange reason it didn't. Something new learned by the ECU?

Tomorrow I will go for a 300 km trip and will log it again for review.

I am planning also to install an oil catch can just to delay carbon deposits formation.

@RicardoM how is your engine running now? Has your problem reapperad till today? Any other advices on this?

Edited 30 August, 20205 yr by msemafor