88 YJ w/FAST EFI swap, getting smoke and fumes from vents and cowl, any ideas?

JoRaff

New Member
Joined
Apr 28, 2022
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1
Location
PA
I’m sure the issue isn’t related to the EFI swap. But wanted to throw it in there. Is it a heater core problem or possible heater core inlet blockage??
 
Does the smoke smell sweet like antifreeze of exhaust? If its sweet smelling and leaving a residue of the windshield its a leaking heater core or leak inside the heater box somewhere.