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 MANUALSCHEVROLET1999CAMARO BASE, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P0453-P0656DTC P0507DTC P0507: IDLE SPEED HIGH (5.7L "Y" BODY)DIAGNOSTIC PROCEDURES
1999 Chevrolet Camaro Base, 2D Coupe, Automatic
Diagnostic Procedures
1999 Chevrolet Camaro Base, 2D Coupe, AutomaticSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
- Start engine. Using scan tool, command RPM from about 500 to 1500 RPM. Repeat 2 times and exit from test. If RPM change responded to within 100 RPM of each command, see DIAGNOSTIC AIDS . If RPM does not respond as commanded, go to next step.
- If engine RPM is too high (greater than 100 RPM), go to next step. If RPM does not change significantly, go to step 5.
- Check for vacuum leaks, throttle plates not closing properly or for faulty PCV valve. Repair as necessary. After repairs, go to step 6.
- Check for excessive deposits in throttle body. Check for parasitic load on engine (i.e., transmission problem). Repair as necessary. After repairs, go to next step.
- Using scan tool, select DTC, CLEAR INFO function. Start and warm engine to normal operating temperature. Select DTC, SPECIFIC, then enter DTC P0507. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, repeat step 2.
- Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test.
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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.