Description
Product Overview
Replacement choke pulloff vacuum brake for carbureted engines. Replaces CPA38, 101-492A, and CPA87. This vacuum-operated diaphragm controls the choke plate during cold starts — a failed pulloff causes hard starting, rough idle, black smoke, and poor cold drivability. Direct bolt-on replacement restores proper cold-start enrichment and smooth warm-up in under 15 minutes.
Key Features
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OEM-Spec Vacuum Diaphragm — Manufactured to OEM specifications for consistent, reliable choke plate control during cold starts and warm-up.
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Direct Replacement — Replaces CPA38, 101-492A, CPA87 — bolts in place with no modifications, adapters, or fabrication.
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Smooth Cold Starts Restored — Eliminates hard starting, rough cold idle, black exhaust smoke, and stumbling on cold engines.
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Universal Carburetor Fit — Compatible with Rochester, Holley, and Carter carburetors using vacuum-operated choke pulloffs.
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15-Minute Installation — Single vacuum line and two screws — typical install under 15 minutes with basic hand tools.
Compatibility
| Make |
Model |
Year Range |
Notes |
| GM / Chevrolet |
Rochester 2G / 4G |
1960s–1980s |
CPA38 Style Pulloff |
| Various |
Holley 2-Barrel / 4-Barrel |
Universal |
Vacuum Choke Pulloff |
| Various |
Carter AFB / AVS |
Universal |
Vacuum Choke Pulloff |
Specifications
| Specification |
Value |
| Part Numbers |
CPA38 / 101-492A / CPA87 |
| Type |
Vacuum Diaphragm Choke Pulloff |
| Connection |
Single Vacuum Port |
| Mounting |
Standard 2-Screw Flange |
Frequently Asked Questions
Q: How do I know if my choke pulloff is bad?
A: Symptoms: hard cold starting, rough idle until warm, black exhaust smoke, choke plate doesn't open smoothly. Test: apply vacuum — rod should retract smoothly and hold.
Q: Will this fit my carburetor?
A: Fits most Rochester, Holley, and Carter carburetors with vacuum choke pulloff and standard 2-screw flange.
Q: How do I install it?
A: Remove old pulloff (2 screws + vacuum line), mount new unit, reconnect vacuum line. Under 15 minutes.
Q: What's the difference between CPA38 and CPA87?
A: Both are vacuum choke pulloffs with similar specs but slightly different linkage arms. This replacement is compatible with both.
Q: Can a bad choke pulloff cause poor fuel economy?
A: Yes. A stuck-closed choke makes the engine run rich constantly — wasting fuel and fouling plugs. Replacement can significantly improve MPG.
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