i need from help for S4 and RS4

[peterchip]

Hi to all,
this is my first post here.
i have problems with my cars.
1 year ago i bought s4 99year,i drive it more 20k km and now i have problem with boost,it was tuned when i bought,but from 2 month the car is not in good condition.I test with vag com ,grupp 115,boost is 2050,but after 4 5min drive hard,pressure go to 1450(limit)and car stop(don`t feel turbo).give me failure code 17864 and 17868.I change 2 new turbo,2 new blow off,new N75,new fuel filter..
I don`t know from where is the problem........
For RS4 2.7Biturbo i bought now and make chip tuning-difference is very big,but
when the car is in third gear and goes from low to high
revs and reaches 3500 to 4500 it feels like the engine is short on fuel and coughs a bit
and can hear a bit a weaselling noise, which I think is sign of good pressure in the
turbo,pressure goes to 2600 any way. But when I get the car in high revs in first gear, there is
no problem.
i change new turbos,new gearbox,new clutch ,new fuel filter and blow off.......

If any can help me...........
thanks advance

[tike0rz]

New blow off, singular? I hope you mean Diverter Valve(s).

Your English is poor, but from what I take you have two cars that are running shitty.

Your S4- You changed the turbos to what? Just curious. Try searching this forum for the codes you explained.

Your RS4- Does it only happen in third gear? That would probably be the transmission...what do you mean it goes to 2600?

Explain clearer if you want help.

[S4 in_lowplaces]

just search on Audiworld.com you'll get more answers there.

[peterchip]

17868 P1460 Exhaust gas temperature control bank 2 limit attained.
17864 - Exhaust Gas Temp Regulation for Bank 1. Limit Reached

sorry for my bad english..

[DAP]

Looks like you need new EGT sensors. Your engine is probably actually getting too much fuel due to the improper EGT enrichment.

[The_Jerbel]

Agreed, change out both the EGT sensors and you should be ok.

[S4BiT]

My car is doing the same thing with 3rd gear when i push the pedal to the floor in low rpm-s and i know i have both egt-s broken.

[peterchip]

Many thanks,tomorrow will buy 2 EGT sensors and will see difference.This is for S4?Can i put other mod file when i have with 1.5bar for this S4 or this will dead car?

Where is the problem with RS4?

[The_Jerbel]

Check for fault codes and do a boost leak test on the RS4.

[peterchip]

It has not fault codes.With vag com 115 i see pressure goes to 2600.Can this problem be solved with new blow offs, for example 710n,becouse now is stock.I see this page http://www.audiworld.com/tech/eng16.shtml

[The_Jerbel]

No, new bypass valves probably won't solve your problem.

[peterchip]

Hi again,
question for S4
yesterday i change EGT sensors,but problem is not solved yet...
again fault codes 17864 and 17868 ....any idea from where is the problem....

[purchasers4]

Did you clear the codes? Try unplugging the ecu fuse for a minute or two and putting it back in.

[peterchip]

About RS4 :
Can you tell me how is max boost with stock turbos,only chip tuning
Now "peak boost" goes to 1.6bar,but in high revs you have to stabile that around 1.1bar.

[schusters4]

About RS4 :
Can you tell me how is max boost with stock turbos,only chip tuning
Now "peak boost" goes to 1.6bar,but in high revs you have to stabile that around 1.1bar.

How many miles to you have on the RS4? The reason I ask is because you might need to take a look at your hoses. Is the RS4 blowing any smoke? If so what color? There might be a leak somewhere, the throttle body boot is always weak point. You'll still throw boost and back off a bit, as you stated, you'll also have a large loss of power too. I also heard that the 6-speed has a weird third gear. There might be something going on with just third gear, maybe a little worn? What kind of gear box work was done?

[VonPooper]

spoolinggggggggggggg

[peterchip]

RS4 is 40000miles with 6speed manual gearbox.I try hoses-all is ok,the car not smoke.
i change both blow offs with 710N.With original file is not this problem.i think this problem will solved if i less pressure in peak boost,but i`m not sure...
Only when i goes from low to high revs have this problem.When i goes from first gear hard(to 6/7000revs)is not problem.Car goes to 175m/h (here 280km/h) of 5 gear,6 gear in 6200rpm is 280km/h ,goes to 6450rpm -this is may be about 300,(becouse my dashboard stay in 280 only)