fuel cut at full boost...? why?

[rs200]

that is the point.. I did it !
my english is to bad .. I can't explain you what happend. total coincidence. if you wish to do that- you couldn't !
the wires is not 100% fixed to engine, and sometimes they had bad contact, sometimes not.
I done this coil conversation many times to my friends, and in every case everithing was perfect, of course acept my cursed audi 200 20v !
they will go in parts next year, and body must be destroyed at garbage yard !
what is cursed.. is cursed !

[Rocco]

today I find out where was the problem. well.. when I collecting the wires of new coils, somewere, somehow , wires of gnd pin 2 touch with gnd pin 4 on cilinder No. 4.
both are gnd , but it still make problem.
glad that problem gone, now car run excelent.
tnx to all for help.

excellent¡¡

who did the electric work there mate?

[rs200]

today I find out where was the problem. well.. when I collecting the wires of new coils, somewere, somehow , wires of gnd pin 2 touch with gnd pin 4 on cilinder No. 4.
both are gnd , but it still make problem.
glad that problem gone, now car run excelent.
tnx to all for help.

[rs200]

can't get any more on old coils. must change some parts and it is not possible!
now we try to change ECU , and it is same problem. today we defenetly confirm that "fuel cut" is not fuel cut, than it restart ECU like Dmitri said.
somewhere is some problem. probobly at coils.
if we find something I will post here.
tnx for now to all !

[prj]

If the problem started with the coils, and you made a plug and play loom, try to change to old coils temporarily by plugging the old cover back in.

If that fixes the problem, then the problem are the coils or the wiring to the coils.

If that does not fix the problem, then it can be bad grounds, bad trigger sensor or bad ecu.

[rs200]

you are right Dmitri.. there is only engine speed sensor problem, and it is not fuel cut.
there is something else , MAF is perfect.
probobly it is the problem. where I have to look?

[prj]

You will throw codes for MAF connector.
I am pretty sure it is not fuel cut, but it's the ECU losing engine speed sensor signal or power, so it misses.

Most likely the ECU clicks as well during this.
Any "fuel cut" software wise will have a "Maximum boost pressure exceeded" code logged.

If there is no such code, it's not fuel cut. End of.

[UrS4boy]

of course.. it is electical problem.. but where? everithing seems ok, even MAF conector.

"Seems ok" could just mean that you haven't investigated it enough and are missing the problem. Check and clean the pins (both male and female). Check the pins for being pushed out of position. Clean the MAF wire. Substitute a known to be good MAF and re-test. Then and only then can you say it isn't the MAF. Even then, it could be a wire problem between the MAF and the ECU.

More MAF info:

http://forums.quattroworld.com/s4s6/msgs/20442.phtml

[rs200]

of course.. it is electical problem.. but where? everithing seems ok, even MAF conector.

[driftin jo]

also I forget to said, that fuel cut is not all time, for exemple:
drive in 3. gear normaly.. and than WOT, full boost is reached, than fuel cut, emediatly after that I put in 4. gear and again WOT, full boost , and nothing , 5.gear WOT and nothing.. everithing is fine.
than everithin was fine 5 minutes later in normal drive fuel cut.. very strange . sometimes is good at WOT, sometimes not.

MAF connector, when mine did this, it was the connector.
The fact that it does it intermittently suggests it is more likely an
electrical problem than a boost leek, especially as it does it
when not at WOT.

[rs200]

also I forget to said, that fuel cut is not all time, for exemple:
drive in 3. gear normaly.. and than WOT, full boost is reached, than fuel cut, emediatly after that I put in 4. gear and again WOT, full boost , and nothing , 5.gear WOT and nothing.. everithing is fine.
than everithin was fine 5 minutes later in normal drive fuel cut.. very strange . sometimes is good at WOT, sometimes not.

[rs200]

they all are OEM VW from golf 5 gti. and work grate on idle.. could they make problem on other revs?
they are OEM !

[prj]

You have bad grounds on valve cover / inlet manifold.

Or you bought B-grade coils, not BERU or Bosch. They will give interference to RPM sensor and ECU will restart.

Use only Bosch or Beru.

[rs200]

I alredy did.. it have it.
it is very strange. there is no fault code or filure which I didn't have on that car in 7 years. it is cursed !
let start from begining.
before one week I changed valve cover and intake manifold ADU-3B , and put rs3 coils. car bun fantastic on idle. then went to drive.
fuel cut , engine check , ISV, clean them .
ride again, fuel cut - RPM sensor, I change them too. now there is no fault code , but fuel cut still exist.
in middle time , I clean MAF, look for ECU ground, done boost leak test, look all fuses, everithing is fine, but this fuel cut ...
my mind will blow !

[prj]

Check grounds to the ECU.