[s-cars] when would you consider dead map sensor? all cylinders shut down under boost

[forrest bradshaw]

recap: 95 S6, last month car started hitting
30psi, then started cutting fuel violently and throwing code for MAP
sensor signal too low. replaced WGFV and added rs2 em.





picked up car today from shop


#2 coil new, all coils ohm equally


stock WG spring re-installed, backed out to flush with top


Pastore's MTM 1+, 3bar vmap, RS2 EM, stromung are motor related mods




so, drove car as stated and peak boost was 15 psi, would flutter
slightly there in all gears, got one 17 psi peak in 4th gear going up a
small hill bout 3000 rpm, no stutters or hesitations.

back at shop I turned the spring down 4 turns and another test
drive, now I have 17 psi and then start missing, back off and try again
same but this time all 5 cylinders shut down in sequence and loss of
power, felt like driving over a rumble pad before a stop sign. this was
at 15 psi, try again and it happened at 10psi, tried again and all
cylinders again shut down at 6 psi.

back to shop, ohmed all injectors, they all test at 16.9 ohms. did
not bother checking for codes again, but previous test drives threw no
codes, not even the MAP code I have been getting before new coil.


backed spring out again and still get fuel cut or massive miss under boost, cannot even light throttle pass another car now.




no boost leaks, manifold to MAP hose is fully attached, did not
pressure test it yet, did not want to start cutting clamps or zip ties
(boost gauge line is zip tied to T fitting at ecu as of last october)




Figure before I do that I will swap ECUs with Elijah's wife's avant
as it has the same software as mine, just gotta catch Eli, he has
family in town.




Hell what is going on here??? should I assume the ECU is shutting
down the cylinders on purpose, why at consideraly lower boost
pressures? can Vmap go bad? is it possible the ECU somehow went back to
stock configuration?





could my couple 30psi spikes last month have killed the Vmap?




Vag tested the WG solenoid and other devices and they worked, tried
to test the injectors with the scan tool and nothign happened, also
tried this on a stock S6 and nothing happened





so sad in Michigan