Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Cranks, But Will Not Run
1993 Saturn SC L4-1.9L SOHC VIN 9SECTION Engine Cranks, But Will Not Run
Diagnostic Chart.:
Diagnostic Chart.:
DESCRIPTION
SATURN has two computerized fuel control systems, throttle body injection (TBI) and multiport fuel injection (MFI). Spark is delivered from a distributorless ignition system (DIS). In order to diagnose this system, battery voltage must be above 11 volts. Cranking speed of the starter must be normal and fuel quality should be checked.
PARAMETERS
^ No start due to no spark or RPM signal.
^ No start due to low or no fuel pressure.
DIAGNOSTIC AIDS
^ Water in the fuel can cause a no start during cold weather starts.
^ A CTS sensor reading incorrectly can cause a no start or a hard start. This may be due to over fueling or under fueling.
^ CTS may be compared to ATS temperature with a scan tool if engine has cooled overnight at ambient temperature. They should be within four degrees of each other with ignition ON and key OFF.
^ A shorted injector will cause a no start condition on both TBI and MFI.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.