Surging...An Update

[funkyjutel]

Well,

Blimey didn't know this was such a controversial topic. Thanks to those who gave me some good advise anyhow. Yes the car will be going back to Impossible on Saturday and I know Mike will do his absolute best to cure the problem.

I have it on good advice from an unnamed source that this problem has not as yet been put down to a map by ANY of the various tuners and no-one can honestly say that they know what it is.

Just to help those techies or general advice junkies, this is what I have had changed/done to the car. Most are related some are not, so please don't draw any wild conclusions.

Part No 06A133062C Valve Control - Changed

"" 078919501C Sender - changed

"" 021906262B Lambda Probe - changed

"" 058906283F Valve - changed

The car was displaying the following faults:

17972 P1564 035 Throttle valve control module - J338 Insufficient voltage for basic settings - Replaced

17705 P1297 035 Connection charger -throttle valve pressure drop (clip on hose tightened)

16502 P0118 035 Sender for collant temp -G62 Signal too high (replaced but not related to this fault)

As you can see there were several related faults. The car is now running A1 according to Dave at Rainworth's from a fault free perspective and on all tests. However as I mentioned previously, the car seems to be seeing a heavy load under accelaration, causing it to back off and on like a yo-yo.

Dave could only put it down to a software fault....We'll see on Saturday.

[stathap]

Good luck for Saturday Andre, hope Mike can sort it out for ya

[funkyjutel]

Cheers Pete

[Josh_PoloGTi]

Good Luck!

Once you get it all sorted, please let us know what it was!

[Delcac]

FJ,

See last two posts in your previous thread.

[EddyH]

Posted this here in reply to a post made in the other thread after it was locked. :confused:

THE ANSWER:-

Clamp the MAP sensor using a diode' date=' fit a manual boost controller to prevent spikes. The ECU is spoofed into thinking max boost is only ever 1bar.. the lambda handles the fueling.. you can run upto 1.5bar on a k03 or 2.0bar on a k04.... no surging just plenty of wheel spin...

PM me for further details.

This is not ecu map related but a design feature/flaw in 20v T engines.[/quote']

That is a solution that works to a fashion but isn't the answer in my opinion. This solution will give jerky throttle response at part throttle due to the MBC trying to run full boost at all times. The lambda only handles fueling on part throttle, at WOT the ECU runs a closed loop using readings from the MAF sensor. Which K04 can handle 2.0bar? I don't know about the one on the 225 engine but the bolt on K04 for K03 engines certainly can't.

It is the ECU map, there are remappers out there that can run high levels of boost without these problems, I've seen K03S cars running 26psi with no running problems.

[Delcac]

FJ, see you Saturday.

[Robi]

FJ,

I have no particular knowledge on engines - but my feeling tells me that those messages are related to erroneus voltages received by ecu from different sensors - I am suggesting to check loose conectors/conections (also use some contact spray) on the cables path that transmit those voltages to ECU.

Check also tight gnd connections and battery voltage under full range of rpm.

good luck!

[redbaron]

It is the ECU map' date=' there are remappers out there that can run high levels of boost without these problems, I've seen K03S cars running 26psi with no running problems.[/quote']

but there is no such thing as a K03S? ask Borg Warner.....

and there are many varients of K04.. mine seems to pull 2 bar without problem..

but cars are never consistent... of course how much boost you get would depend on head/i.c./pipework etc so they may not all do it..

[EddyH]

but there is no such thing as a K03S? ask Borg Warner.....

and there are many varients of K04.. mine seems to pull 2 bar without problem..

but cars are never consistent... of course how much boost you get would depend on head/i.c./pipework etc so they may not all do it..

I assumed most people would understand I was refering to the 8-vane K03 when using the term K03S. I know it's not the official designation but it is the one commonly used and K03 is usually reserved for the older and inferior 12-vane K03.

I'll take your word that you were running 2 bar but how do you get round the fueling issues of running that amount of boost? The standard injectors would be maxed out even with a 4 bar FPR at the power level that boost would bring. Larger injectors would be necessary but this would require a remap just like using a 4 bar FPR otherwise the car would run rich when in closed loop.

[redbaron]

I assumed most people would understand I was refering to the 8-vane K03 when using the term K03S. I know it's not the official designation but it is the one commonly used and K03 is usually reserved for the older and inferior 12-vane K03.

I'll take your word that you were running 2 bar but how do you get round the fueling issues of running that amount of boost? The standard injectors would be maxed out even with a 4 bar FPR at the power level that boost would bring. Larger injectors would be necessary but this would require a remap just like using a 4 bar FPR otherwise the car would run rich when in closed loop.

Yes Eddy i do know the issues of 2bar... - i cant hold 2bar for long and certainly not at high revs.... have tried 4bar but with limited sucess...I gave up on trying to max the fueling as i am selling the car....:(

[ncarring]

I assumed most people would understand I was refering to the 8-vane K03 when using the term K03S. I know it's not the official designation but it is the one commonly used and K03 is usually reserved for the older and inferior 12-vane K03.

Most people with a deep knowledge of Borg Warner turbochargers maybe ... i.e. you and Paul :P

[EddyH]

Most people with a deep knowledge of Borg Warner turbochargers maybe ... i.e. you and Paul :P

Sorry. Having been a long time member of uk-mkivs I've just got used to calling them either K03 or 'K03S' as everyone seems to know what they are on there. There's only 4 Golf 1.8T engine codes, 2 have the K03 (AGU and ARZ) as they are older engines and 2 have the 'K03S' (AUM and AUQ). Makes things very simple.

I've not been on here long but I understand that on certain skoda 1.8T's the same engine code can have either a K03 or 'K03S' the ARX engine on the 4x4 being one example.

I'm still learning when it comes to the engine codes and specs of skoda's so a pointer to somewhere that covers this would be appreciated.

[ncarring]

I don't think (with a few exceptions) we're as technical here - so assume we need education - we all love to learn. I'm not sure anyone can answer your question, but I look forward to finding out.

Meanwhile must try to get into uk-mkivs again - last time I tried I couldn't get the address to resolve... :(

[DGW]

I'm still learning when it comes to the engine codes and specs of skoda's so a pointer to somewhere that covers this would be appreciated.

Eddy, Have you read this FAQ?

[funkyjutel]

Mine is a KO3S by the way

[Josh_PoloGTi]

Maybe someone could do an FAQ regarding Turbo Chargers?

One of the items could be the generally used terms for the various turbos on 1.8T's!

Oh, and some info on the turbos used in the 1.9 PD would be useful, as I haven't a clue about them!

[redbaron]

Josh,

looking at your Sig you need to learn to park straight first... then worry about what turbo you have......

[EddyH]

Eddy, Have you read this[/url'] FAQ?

Thanks Denis, I've skimmed over it before but couldn't quite remember the details of the same engine code with too different turbo's. It makes things confusing and could also lead to dissapointment if buying a car built around the changeover date. Seems a strange decision not to have changed the engine code for the change of turbo.

BTW the info on the ARZ engine is slightly incorrect; it has the non-sport K03.

Have any Octavia owners on here with the AGU engine upgraded to the K03S? It's becoming quite common on Golf's with this engine and also the ibiza cupra that only ever came with the K03. I believe Jabba have remapped quite a few such setups prefering them to the bolt on K04. I have seen figures achieved ITRO 240-250bhp on Jabba's RR.

[drew_smith]

whooooshhhhhhhh....

[Ootohere]

Not that quick, it took 12 years....