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 MANUALSPONTIAC1987GRAND PRIX BROUGHAM, 5.0 HREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCARBURETOR - ROCHESTER E2ME 2-BBLTESTINGCHOKE CAP RESISTANCE TEST
1987 Pontiac Grand Prix Brougham, 5.0 H
Choke Cap Resistance Test
1987 Pontiac Grand Prix Brougham, 5.0 HSECTION Choke Cap Resistance Test
- Connect one lead of an ohmmeter to choke cap terminal and the other lead to choke cap ground. Ensure metal-to-metal contact is achieved (not metal oxide film metal) and false readings are prevented. Throughout the test, the ohmmeter reading should be under 30 but over zero. At any point of this test, if ohmmeter reading is outside this range, start the test all over. If this ame improper reading repeats, replace choke cap.
- With choke cap connected electrically, start engine and run form 3 minutes. Shut engine off. During this 3 minutes, the CER should remains seated for an engine which was warm at the beginning. This rod should gradually lower to seat for an engine which was cold at the beginning. If the CER does not respond this way, note this and continue with the test.
- The choke cap should be quite warm to the touch. Using choke tester, cool cap down by directing cold air towards the oval-shaped insulator (not the case) around the cap terminal. The ohm reading should gradually vary and eventually a suddenly increase. Stop the cooling. This sudden increase should take place within 10 minutes since cooling began. If this sudden resistance change does not take place within the above time limit, the choke cap is defective and should be replaced. If this sudden change takes place within this time limit, continue on with the testing.
- Using choke tester, warm-up the cap by directing hot air towards the oval shaped insulator. The ohm reading should vary gradually and eventually suddenly decrease. Stop the warming. This sudden decrease should take place within 10 minutes since warming began.
- If sudden resistance change does not take place within the above time limit, replace choke cap. If this sudden change takes place within this time limit, the choke cap is okay.
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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.