Porsche Enthusiasts Club Forum

My 1986 944 turbo stalls when boost comes on about 3psi
ive got no cycling valve. Lindsey dpw/manual boost knob/3bar reg/chipped dme.klr

I have tried
:different dme and klr
:different air flow meter
:fuel pump with permenant live supply
:spark present after stall
:disconnected boost pipe to klr - still stalls
:good vacum lines tested with mityvac -10psi
:blocked air idle valve no change
ual port wastegate is not open
:spark plugs are black but not wet with fuel and running rich

:Manually pressing the flap on air flow creates same fault stalls engine
:engine stalls imediately with no spluttering

is it maybe throttle position sensor ?
Electrical grounding issue?
blowing spark out?

What are your thoughts

i would suggest doing a static boost test (pressurising the intake system with the engine off) to test for leaks. tps can be tested as per clarks garage.

I cleaned engine to bulk head ground
replaced spark plugs and coil

now running better but backfires like crazy about 0.8 bar so a few more things to do
and more playing with lindsey manual boost controller