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 MANUALSCHEVROLET1984CAVALIER L4-121 2.0L VIN P TBIREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTPROM - PROGRAMMABLE READ ONLY MEMORYTECHNICAL SERVICE BULLETINSRECALLSCAMPAIGN - DRIVEABILITY UPDATE SUPPLEMENT
1984 Chevrolet Cavalier L4-121 2.0L VIN P TBI
Campaign - Driveability Update Supplement
1984 Chevrolet Cavalier L4-121 2.0L VIN P TBISECTION Campaign - Driveability Update Supplement
85CHEVY07
SUPPLEMENT 84-221 (a)
6 (VI)
January, 1985
Subject: CHECK ENGINE LIGHT (CODE 42)
SPECIAL POLICY COLD STARTABILITY ADJUSTMENT SUPPLEMENT
Model and Year: 1983-1984 CHEVROLET CAVALIER MODELS EQUIPPED WITH 2.0L ENGINE
(VIN CODE P) AUTOMATIC TRANSMISSION AND FEDERAL EMISSION SYSTEM
TO: ALL INVOLVED DEALERS
Some 1983-1984 Chevrolet Cavalier models equipped with the cold startability adjustment parts, authorized in "Chevrolet Dealer Service Bulletin" 84-221 dated November, 1984; may experience a check engine light, and Code 42 may be stored. Vehicle performance will not be affected.
The check engine light in many cases is being generated by false signals to the ECM and can be corrected by restarting the vehicle following the procedure below:
1) Turn key to off position, wait 10 seconds.
2) Restart the engine using the starting procedure placard on the visor.
RELEASE THE KEY AS SOON AS THE ENGINE HAS STARTED.
If the check engine light remains on after using the restarting procedure other conditions may be indicated.
Efforts are being made to eliminate this condition. Information will be forthcoming.
RENDER: 1.0x
NO RELATED
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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.