TD New Guy
Join Date: Apr 2010
My Ride: glhs
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I have a low-mileage '86 Omni GLHS. Installed a Stage 2 logic module and car was running great. Decided to install a 3" swing valve and bigger exhaust (with test pipe instead of the catalytic converter.) Now the engine is sputtering/stalling. Seems to be happening around 2500 but it may just be when the engine is transitioning from vacuum to boost. The problem resolves if I give it more throttle.
I've done the swing valve and exhaust pipe on other Turbo 2 cars and never had any issues, but I'd always left the catalytic converter on in those cases. This is the first time I've removed a converter, so I'm wondering if the exhaust mod is creating a lean condition, and if bigger injectors or an adjustable fuel pressure regulator is called for.
The only other mod I made was disconnecting the EGR valve. I don't think that's causing the problem, but maybe I should have plugged or not plugged a hose somewhere?
Grateful for any suggestions.