Step 4. Carbon Build-Up, Removing

Based on your diagnosis during step 2 (page 2), select one of the following service solutions.


Minor build-up

If minor carbon build-up has been diagnosed:

^ add one 20 oz. bottle of Autobahn gasoline additive (P/N: ZVW 246 001) to a full tank of fuel

Note To completely remove minor carbon deposits from the intake valves, the customer should be advised to repeat the fuel additive application two consecutive times (one 20 oz. bottle per tank full).
CAUTION Do NOT exceed four applications of fuel additive without changing the engine oil. Follow the recommended oil change instructions on the back of the bottle.


CAUTION

Part numbers are for reference only. Always check with your Parts Department for latest information.
Step 4 (Minor Build-up)
Suggested Repair Time: N/A


Heavy build-up

If heavy carbon build-up has been diagnosed, remove the build-up mechanically:

^ remove cylinder head and intake valves

^ mechanically remove carbon build-up

^ reinstall cylinder head, refer to repair manual for torque values


Step 4 (Heavy build-up)
Labor Operation 1560550
Suggested Repair Time: 620 tu
Quality Check: 10 tu