What is the firing order for a 1990 Geo Storm?
1,3,2,4 that is the firing order.
Geo Storm was manufactured from 1990-1993. Two engines were available the 1600cc SOHC and the 1600cc DOHC while it is possible to switch between one style engine for the other it is rather involved. Other sources for these engines are the Isuzu Stylus for the SOHC or the DOHC or the Isuzu Impulse XS for the DOHC. The Isuzu Impulse RS was a DOHC Turbo which requires considerable modification to install.
The answer for the header is no. Geo Storms, Geo Metros and Geo Prisms were manufactured by 3 different companies. Storms were rebadged Isuzu Impulses ... Prisms were rebadged Toyota Sprinters .. and Metros were rebadged Suzuki Swifts ... hence no interchangeability of those parts. Hope this helped, sorry it was a no answer though.