What spark plug and gap does this 1985 Ford 4.9L emissions label specify?

Spark plug BSF-42 with a gap of .042-.046 inch.

What is the ignition timing specification and procedure?

Adjust ignition timing to 10° BTDC with the transmission in neutral: turn off the engine, disconnect the single wire/black connector near the distributor, restart the previously warmed-up engine, adjust timing, then turn off the engine and restore the electrical connection.

What idle RPM should the vehicle run at after the ISC adjustment?

After the ECT sensor is reconnected, idle should be automatically controlled at 550-650 RPM for manual transmission in neutral, or 500-600 RPM for automatic transmission in drive.

Can the idle mixture or choke be adjusted on this engine?

No. The label states the vehicle is equipped with EEC IV and a feedback carburetor, and the idle mixture and choke are not adjustable.

What altitude is this vehicle's emissions calibration designed for?

Compliance is demonstrated and designed for principal use above 4000 feet; for new vehicle compliance below 4000 feet, see service publications.

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1985 Ford 4.9L Emissions Decal E5AE-9C485-CCY - Vacuum Routing & Tune-Up Specs

1985 Ford truck Important Vehicle Information decal: vacuum hose routing, spark plug BSF-42 gap .042-.046

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1985 Ford Motor Company underhood emissions / vacuum hose routing decal with idle and timing adjustment notes; spark plug BSF-42, gap .042-.046, TWC catalyst.

AI caption May 2017 · Photo 65 of 588

This is a scan of the Ford Motor Company emissions / Important Vehicle Information decal (Vehicle Emission Control Information label) with part number E5AE-9C485-CCY, marked CATALYST. It applies to 1985 model year light-duty trucks with the 4.9L engine (calibrations 5GM single tank / 5GQ dual tanks, engine family FFM4.9TIHG66 with AIP/EGR/EGS/TWC emission equipment). The label gives underhood tune-up procedures: set parking brake and block wheels, make adjustments at normal operating temperature with accessories off; the vehicle is equipped with EEC IV and a feedback carburetor with non-adjustable idle mixture and choke. It details the five-step ignition timing procedure (adjust to 10° BTDC with the single-wire black distributor connector disconnected) and the fast idle / ISC (Idle Speed Control) adjustment procedure using the ECT sensor disconnect, with target RPM values (1500-1600 RPM, curb idle 550-650 RPM manual / 500-600 RPM automatic). Spark plug is BSF-42 with a .042-.046 gap. It notes EPA compliance for high-altitude (above 4000 feet) principal use. The right half shows the vacuum hose routing diagram with components including the carbon canisters, MAP, A/CL DV, VRDV, air pump ACV, EGR, carburetor, TVV, SV-CBV, VCK V, PCV, CPRV, and TAB/TAD/EGR solenoid valves.

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Frequently asked questions

What spark plug and gap does this 1985 Ford 4.9L emissions label specify?: Spark plug BSF-42 with a gap of .042-.046 inch.
What is the ignition timing specification and procedure?: Adjust ignition timing to 10° BTDC with the transmission in neutral: turn off the engine, disconnect the single wire/black connector near the distributor, restart the previously warmed-up engine, adjust timing, then turn off the engine and restore the electrical connection.
What idle RPM should the vehicle run at after the ISC adjustment?: After the ECT sensor is reconnected, idle should be automatically controlled at 550-650 RPM for manual transmission in neutral, or 500-600 RPM for automatic transmission in drive.
Can the idle mixture or choke be adjusted on this engine?: No. The label states the vehicle is equipped with EEC IV and a feedback carburetor, and the idle mixture and choke are not adjustable.
What altitude is this vehicle's emissions calibration designed for?: Compliance is demonstrated and designed for principal use above 4000 feet; for new vehicle compliance below 4000 feet, see service publications.