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 MANUALSGMC1995SUBURBAN K2500, 7.4 NREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/O CODES - GASOLINESYMPTOMSENGINE WILL NOT IDLESYMPTOM DEFINITION
1995 GMC Suburban K2500, 7.4 N
Symptom Definition
1995 GMC Suburban K2500, 7.4 NSECTION Symptom Definition
Engine starts but will not run at idle. Engine runs if accelerator is held at part throttle.
Possible Causes & Corrections:
- Problem is most likely in Idle Air Control (IAC) system. See DIAGNOSTIC AIDS in DTC 35 chart in appropriate TESTS W/CODES article below.
- TESTS W/CODES - 2.2L
- TESTS W/CODES - 3.1L
- TESTS W/CODES - 3.8L
- TESTS W/CODES - 4.3L
- TESTS W/CODES - 5.0L
- TESTS W/CODES - 5.7L
- Check EGR system.
- Check park/neutral switch.
- Disconnect MAP sensor. If condition is corrected, replace sensor.
RENDER: 1.0x
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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.