2001-2010 B4000 – BUZZ NOISE – UPPER ENGINE
APPLICABLE MODEL(S)/VINS
2001-2009 B4000
2010 B4000 (Canada only)
Buzz noise from the upper engine at about 1900 RPM under light load acceleration.
REPAIR PROCEDURE
- Prior to following normal diagnostics, check the fasteners (A) that attach the ignition coil bracket to the intake manifold for proper torque.
- If the bolts are found torqued under 89 lb-in. (10 N•m), proceed to Step 2.
- If the bolts are found to be torqued correctly, this procedure does not apply and follow normal diagnostics.
- Torque both ignition coil bracket to intake manifold bolts to 89 lb-in. (10 N•m). Then tighten an additional 45 degrees.
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Chevron Techron Concentrate Plus Fuel System Cleaner, 20 oz., Pack of 1
- QUALITY ASSURED
- Reduces: rough idle, engine surge, hesitation, and spark plus fouling
- 20 oz. bottle.
- Improves: cold start performance, and fuel stability for up to one year
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Lucas Oil 10020 Upper Cylinder Lube/Fuel Treatment - 5.25 fl oz.
- The world’s #1 fuel additive for both gasoline and diesel engines
- A great tune-up in a bottle – treats gasoline, diesel fuel and increases MPG
- Cleans and lubricates the fuel system, including fuel injectors, carburetor and combustion chamber
- Improves fuel economy by burning excess exhaust emissions
- Increases power and acceleration by improving fuel flow and reducing deposit buildup
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