SL L4-1.9L SOHC VIN 9 (1991)
The gasket between the TBI unit (all 1991 and 1992 engines built before and including VIN NZ151498) and intake manifold can protrude into the
throttle body bore causing fuel to puddle on it.
The engine calibration (1991-1992 vehicles only) can cause a start/stall condition due to the calibration supplying a lean start-up fuel mixture, if the
ambient temperatures are between 20-56°C (68-133° F). This condition can occur during initial start and/or after the engine has been operated for one
minute or more.
IMPORTANT:
The new engine calibration must only be installed if the vehicle's TBI unit gasket has been replaced, fuel and/or engine electronic control system are
found to be operating properly.
If the fuel system will not hold pressure, the TBI unit must be cleaned with air pressure to eliminate debris that may cause an intermittent start/stall
condition. Follow the TBI unit cleaning procedures in this bulletin.
IMPORTANT:
After the start/stall calibration has been installed, the customer may notice a slight vehicle hesitation on initial launch, if the engine is allowed to idle
for more than 90 seconds. This slight hesitation goes away when the coolant temperature 'warms up a few degrees or the vehicle is driven
immediately after initial engine start.
CORRECTION:
If the start/stall condition is verified, proceed to the following figures to repair the concern.
Start/Stall Fuel System Diagnostic Flow Chart
