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.
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HOMESERVICE MANUALSCHEVROLET1995SPORTVAN G20, 6.5 PREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/O CODES - GASOLINESYMPTOMSHESITATION, SAG OR STUMBLESYMPTOM DEFINITION
1995 Chevrolet Sportvan G20, 6.5 P
Symptom Definition
1995 Chevrolet Sportvan G20, 6.5 PSECTION Symptom Definition
Momentary lack of response when accelerator is pushed down. Can occur at any vehicle speed. Usually occurs after a stop. If severe enough, may cause engine to stall.
Possible Causes & Corrections:
- Check for faulty spark plug wires. Check for fouled spark plugs.
- Check for open in ignition system ground circuit. Ensure initial ignition timing is correct.
- Ensure fuel pressure is correct in all speed ranges.
- Check for poor fuel quality or water-contaminated fuel.
- Ensure TP sensor does not stick or bind. Voltage should increase at a steady rate as throttle is moved toward wide open throttle.
- Check MAP sensor response and accuracy. See appropriate SYSTEM/COMPONENT TESTING article for specific testing procedures.
- SYSTEM/COMPONENT TESTS - 2.2L
- SYSTEM/COMPONENT TESTS - 3.1L
- SYSTEM/COMPONENT TESTS - 3.8L
- SYSTEM/COMPONENT TESTS - 4.3L
- SYSTEM/COMPONENT TESTS - 5.0L
- SYSTEM/COMPONENT TESTS - 5.7L
- SYSTEM/COMPONENT TESTS - 7.4L
- Check canister purge system for proper operation.
- Check EGR valve for proper operation.
- Ensure correct PROM is installed in PCM. Check dealer for latest application.
- Check charging system output. Repair if output is less than 9 volts or greater than 16 volts.
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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.