No turbo boost - help please

[Mitchy]

My mate reset the TB the other night when he connected his diagonstic gear to car. He used it to reset it and not what you suggest. I assume it would achieve the same result?

Yes you can do it 2 ways, 1 via vagcom (which he did) or the other by disconnecting battery.

Both the same.

Although the disconnection of battery, easy 2 minute job, just loosen 1 of the terminals resets ecu which the vagcom method doesn't.

It may be worth a try as the more you try, the more you can rule out to narrow it down

 

[Mitchy]

Ok thanks I will try that without getting caught be police or crashing due to looking at gauge. lol

Best gear to do it is in 4th so you'll be doing around 105ish on speedo @ 6500.

Best find a quiet road, or should i say private use track

 

[Blelock]

Ok just back from test drive. using 3rd and 4th gear. And yes at 6500rpm in 4th reading about 105mph. I love my private road. Well worth buying for testing cars lol.

Max boost is at about 3000rpm and is 1.7-1.8 bar.

At 5000rpm boost dropped to around 1.4 bar.

At 6500rpm boost was at about 1.1 bar.

Whats this tell you Mitchy? No leaks?

Car didnt go into limp mode. Car was driving great.

I think when car is started cold it is either in limp mode or not.

 

[Blelock]

Coolant sensor failure will bring up a permanent engine warning light and the fault code generated alerts you to coolant sensor failure.
He's made no mention of the engine warning light or fault code relating to coolant sensor so i doubt its this. Additionally, i had the coolant sensor fault for about 6months and it doesn't make any difference to the performance of the car. Its a very very common fault and has been talked about many times on here. It never once put my car into limp mode.

Fuelling is calculated by signals from the lambda and MAF. If you have a dodgy coolant sensor, it doesn't neccessarly mean the ecu is going to add more fuel.

Like i said in my last response..

You are using 95 ron cheap fuel in a remapped car
you're running a standard DV
You have an unknown map
You are overfuelling by running a 4bar FPR.

Its definitely down to 1 of these or a mixture of them all. Guaranteed! Seeing as i tested 95 ron fuel a couple of weeks ago and couldn't rev past 4500 without going into limp, 1st port of call is to stick the good stuff in.

Possibly could be temp sensor. When engine started from cold car is either in limp mode or not. To date when engine is warm and started it has never went into limp mode.

 

[chriswilks]

this is identical to my car,however mines an LC.when cold (or water temp is low) it will go into limp mode.once the engine is warm only then will it resume full boost once restarted.

its definately temp related but as Blelock states,the car drives spot on once its warm.

mines not a well known remap also which makes me think that the likes of revo cc etc...had this problem and ironed it out before launching their remaps???

ive had mine on vag com and all is well????????

 

[P-torque.co.uk]

Cold start problems are within the stock/tuned mapping and must be mapped out to stop this problem.

If you connect to VAG-COM you should be getting an error ''17705''

If this is the case, the mapping must be adjusted to stop this

 

[Mitchy]

Your car is boosting as it should be then so thats great news Rules out major boost leaks, like loose pipes, holes in pipes etc but could still be DV leaking slightly.

Coolant temp sensor failure will give you a permanent engine warning light and fault code to match. Your fault code doesn't really relate to that. Not unless its on its last legs and not gave you a fault code as of yet, but doubt it.

Best bet is to change the valve to the 007p and disconnect the battery for 5-10mins. This will reset the ecu.

Once you've tried that and if its still behaving the same, its scratch the head time haha. Coolant sensor if it logs that as a fault.

Response above by p-torque also

 

[Blelock]

Thanks again - so well 007P arrives I will fit it and disconnect battery and try that.

 

[chriswilks]

Cold start problems are within the stock/tuned mapping and must be mapped out to stop this problem.

If you connect to VAG-COM you should be getting an error ''17705''

If this is the case, the mapping must be adjusted to stop this

tbh the problem doesnt bother me as its only when its cold,is it doing any harm??

 

[Blelock]

Changed coolant temp sensor tonight. So will just have to wait and see if this cures it over the next lot of days.

Forge DV from Awesome must have got lost in the post as it still has not arrived.

 

[Squale]

Hi Blelock,

I got exactly the same problem on my S3, I cant figure it out since ages, so if you find the answer please share

thx !!

 

[Blelock]

Hi Blelock,

I got exactly the same problem on my S3, I cant figure it out since ages, so if you find the answer please share

thx !!

Yeah I will let you know if I get it sorted.

What modifications have you done to your car?

 

[Squale]

Yeah I will let you know if I get it sorted.

What modifications have you done to your car?

The car is ABT remapped, catback inox exhaust, silicone induction hose, JR cotton panel filter.

thx for your feedback

 

[Blelock]

Changed coolant temp sensor tonight. So will just have to wait and see if this cures it over the next lot of days.

Forge DV from Awesome must have got lost in the post as it still has not arrived.

So update: Changing the coolant temp sensor has not fixed my problem.
Forge DV from Awesome still not arrived!!! So have not ruled out the DV being the problem as yet.

COME ON AWESOME!!!

 

[Blelock]

Forge 007 fitted last night - so we will see if this cures my problem over the next few days

 

[Blelock]

Forge 007 didnt cure problem.

Next step is to put 3 bar FPR back on instead of 4 bar.

 

[ArosaRacer]

from what ive read, its sounds like my LCR before a coil pack fails, wont boost then it does. Maybe its the starting of coil packs going

 

[Blelock]

from what ive read, its sounds like my LCR before a coil pack fails, wont boost then it does. Maybe its the starting of coil packs going

Changed DV and coolant temp sensor. From what I have read on here maybe I shouldnt be running a 4 bar FPR. So back to 3 bar FPR. Next step back to standard map. If it still does it I will have to leave it into the dealers as its under warranty).

 

[traumapat]

i think its a generic fault.. temp related.

mine does this always on a cold engine...just as described but eventually a push in 6th gear sometimes sorts it out.. otherwise a restart. i only notice it in the winter.

i vagcom it once a month and the car runs great usually.

i just live with it

 

[Blelock]

i think its a generic fault.. temp related.

mine does this always on a cold engine...just as described but eventually a push in 6th gear sometimes sorts it out.. otherwise a restart. i only notice it in the winter.

i vagcom it once a month and the car runs great usually.

i just live with it

Generic Fault? What do you mean?

What you done to yours that you get 325bhp?