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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSPONTIAC1987GRAND PRIX LE, 5.0 HREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEM5.0L FEEDBACK CARBURETOR TESTS W/CODESDIAGNOSTIC MATERIALSDIAGNOSTIC CHARTS
1987 Pontiac Grand Prix LE, 5.0 H
Diagnostic Charts
1987 Pontiac Grand Prix LE, 5.0 HSECTION Diagnostic Charts
The diagnostic charts are used to find and repair problems which the on-car diagnostics have found. These charts include:
- Charts which test the reliability of the self-diagnostic system.
- Charts which help fix problems which are "SERVICE ENGINE SOON" light related.
- Charts which test the computerized fuel control system performance.
- Charts which help fix a problem when the on-car diagnostics don't work.
- ENGINE CRANKS BUT WON'T RUN charts. Refer to the appropriate TROUBLE SHOOTING chart in the CCC TESTS W/O CODES article in this section.
- Charts where a stored trouble code leads you to a particular problem. See ECM TROUBLE CODE DEFINITION and DIAGNOSTIC AIDS in this section. Charts which are used because the SYSTEM PERFORMANCE CHECK found a problem.
NOTE:
Although there are many charts connected with computer diagnosis, only 2 charts are needed to prove system is operating properly. Normally, only 3 charts are necessary to find a problem, if one exists.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.