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 MANUALSCHEVROLET1999PICKUP C2500, 2D PICKUP, 6.5 F, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 239 (ENGINE CONTROLS - TROUBLE SHOOTING - NO CODES - 3.4L)SYMPTOMSCUTS OUT, MISSESSENSOR/SYSTEM
1999 Chevrolet Pickup C2500, 2D Pickup, 6.5 F, Standard
Cuts Out, Misses: Sensor/System
1999 Chevrolet Pickup C2500, 2D Pickup, 6.5 F, StandardSECTION Sensor/System
WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect for conditions which may cause an incorrect idle speed:
- Throttle body tampering, excessive deposits, or damage.
- Restricted air intake system.
- Large vacuum leak.
- Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking especially between the Mass Airflow (MAF) sensor and the throttle body.
- Inspect the Throttle Position (TP) sensor and related circuit wiring. Refer to DTC P0123: THROTTLE POSITION SENSOR CIRCUIT - HIGH VOLTAGE under DIAGNOSTIC TESTS in SELF-DIAGNOSTICS - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.
- Monitor the 24X crank sensor and the CMP sensor signal parameters on the scan tool. If both are not responding, test the sensor feed circuit. Both sensors use a separate feed circuit but are internally connected to power. Check all CKP sensor "A" and CMP sensor circuits for intermittents.
- Monitor the 3X crank sensor parameter on the scan tool. If the 3X crank sensor parameter is not responding, inspect the CKP sensor "B" and circuits for intermittents. Inspect the Ignition Control (IC) circuit, IC timing control circuit, low resolution engine speed signal circuit and the low reference circuit for intermittents. If these circuits become open, or shorted, they may not set a Diagnostic Trouble Code (DTC) immediately, but are capable of causing driveability complaints.
- Check the CKP sensor "B" for an internal short. Go to ELECTRONIC IGNITION SYSTEM DIAGNOSIS under IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING - 3.4L ALERO, GRAND AM, IMPALA & MONTE CARLO article.
- Check the Exhaust Gas Recirculation (EGR) system for proper operation.
- Check the Positive Crankcase Ventilation (PCV) valve for proper operation.
- Inspect the Transaxle Range Switch input with the vehicle in drive and the gear selector in drive or overdrive.
- Inspect the following for damage:
- Bent balancer interrupter rings.
- Damaged Crankshaft Position (CKP) sensor.
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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.