vag com + strange problem

[inc13]

1 st problem is with engine :when boost exeeds 0,5 bar ,engine sounds like it has lack fuel or something like that.
Done so far: Checked Maf ,its nice and clean,wires are ok,supply to maf is ok

2nd problem is:i have vag com cable and vag com 3112 software, soft cant any control units(eng.,abs,acc) .. supply is present in socket(black)

Ecu is chipped( skn ? ) and it has 300kpa map

[inc13]

update: i replaced original maf with new porsche 968(rs2) maf,adjusted barometric sensor f96 (was far out) .. but nothing changed

[inc13]

Done so far ..
*new porsche Maf (rs2)
*new rs2 Injectors
*new rs2 Fpr
*adjusted F96
*tried other ecu ,checked blink codes (shows ok/4444)

everything is exactlty the same

[quattronutter]

most likely culprits are,boost leak,knackered wastegate diaphgram or maybe a weak fuel pump?have you disconnected the battery to remove the fault codes?or removed the motor fuses in the fuse box to clear them ..

[topsparky]

1 st problem is with engine :when boost exeeds 0,5 bar ,engine sounds like it has lack fuel or something like that.
Done so far: Checked Maf ,its nice and clean,wires are ok,supply to maf is ok

2nd problem is:i have vag com cable and vag com 3112 software, soft cant any control units(eng.,abs,acc) .. supply is present in socket(black)

Ecu is chipped( skn ? ) and it has 300kpa map

if i were you the next step would be to pressure test the boost pipes i have a test kit and compressor but am 150 ish miles away but if you don't mind the travel i will pressure test it for you just pm me and i'll give you my address

[inc13]

most likely culprits are,boost leak,knackered wastegate diaphgram or maybe a weak fuel pump?have you disconnected the battery to remove the fault codes?or removed the motor fuses in the fuse box to clear them ..

Btw wastegate is also checked ,fuel pump was changed under 10 k miles ago in audi service(original part). Fault codes are removed ,battery is been disconnected times.
Wierd thing is there is no fault codes fuses are also checked

Pipes from /to IC are checked,IC is secured to place (bolt mod)

[inc13]

if i were you the next step would be to pressure test the boost pipes i have a test kit and compressor but am 150 ish miles away but if you don't mind the travel i will pressure test it for you just pm me and i'll give you my address

Thnx mate ,150 miles is bit much for pressure test .. i try to figure out how i can that in here

[quattronutter]

could be a dodgy wgfv,have you checked the inlet hose from airbox to turbo?may also be a dodgy coilpack or ht lead or ?or a fault with distributor drive gear?

[quattronutter]

worth checking all the vacuum pipes,including the pipe to the ecu..

[inc13]

could be a dodgy wgfv,have you checked the inlet hose from airbox to turbo?may also be a dodgy coilpack or ht lead or ?or a fault with distributor drive gear?

Engine is aby , that will leave dizzy out of the game . Problem starts when Boost exeeds 0,5 - 0,7 bar ...before that engine runs ok.
Coilpack problem will affect running without boost also

coilpack problem i had before ,also one POS is replaced .. no problems with after that

All this crap began when car was standing 8 months

worth checking all the vacuum pipes,including the pipe to the ecu..

Thats also done .. ok
Boost gauge is connected to same ecu pipe

[quattronutter]

first off i would try pressure testing to rule out any boost leaks,may also be worth trying it with a standard ecu to rule out any problems there,a faulty air intake temp sensor will cause overboost protection but this usually occurs at about 3-4k rpm,other things may be,dirty or worn out injectors or bad wiring somewhere,maybe dirty or damaged earth wire?

[inc13]

first off i would try pressure testing to rule out any boost leaks,may also be worth trying it with a standard ecu to rule out any problems there,a faulty air intake temp sensor will cause overboost protection but this usually occurs at about 3-4k rpm,other things may be,dirty or worn out injectors or bad wiring somewhere,maybe dirty or damaged earth wire?

*other ecu =Done
*injectors=New

iat should generate faultcode ?

[S2central.net]

iat should generate faultcode ?

Only if its open or short circuit. If its just out of spec then Motronic won't raise a fault code. Annoying I know... Measure resistance across IAT on a cold morning (near 0 celsius) with a cold engine, during the daytime (say 10 celsius) with cold engine and with a hot engine (say 40 celsius).

You should get three very different resistance values across the IAT. You can compare those with others and/or a new part for sanity.

I have a graph somewhere of correct behaviour for the IAT.

Paul

[valjo]

have you checked spark plugs? it may sounds strange, but i have the same problems so i replaced sparks and problms gone ......

[inc13]

have you checked spark plugs? it may sounds strange, but i have the same problems so i replaced sparks and problms gone ......

Plugs are new

today i installed a/f meter (autometer ,n/b) ,it shows all the time Lean