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Here's the text some engine ping spark knock related TSBs. THIS TSB IS AN UPDATE TO THE ONE LISTED BELOW TSB # 09-06-99 Date: . Sep. 10, 1999 models: 1994-99 BR/BE Ram truck V6, V8 1994 - 1999 (AB) Ram Van 1994 - 1999 (AN) Dakota 1994 - 1999 (BR/BE) Ram Truck 1998 - 1999 (DN) Durango 1994 - 1998 (ZJ) Grand Cherokee 1996 - 1998 (ZG) Grand Cherokee NOTE: THIS BULLETIN APPLIES TO VEHICLE EQUIPPED WITH A 3.9L, 5.2L. OR 5.9L GASOLINE ENGINE. Discussion: This bulletin involves the replacement of the engine intake manifold plenum pan gasket. The test procedure and the parts list for the different engines follows in the TSB. Both the above are "...reimbursable within the warranty.", meaning you will have to pay for it if you are past the 3/36. Fight that out. Symptoms: An engine intake manifold plenum pan gasket oil leak may occur on some V-6 and V-8 style engines. The oil leak is internal to the engine so no external oil leakage will be present. Two symptoms of this oil leak condition may be present. The vehicle operator may experience an engine spark knock noise during acceleration and/or a high amount of engine oil consumption. The intake manifold plenum pan gasket has been revised to address this condition. Diagnosis: If the intake manifold plenum pan gasket is leaking, a vacuum source will be created in the engine. Any engine blow-by and outside filtered air will be drawn past the leaking pan gasket and into the intake manifold. In most cases, an engine at idle will create the highest vacuum and lowest amount of engine blow-by. 1 . Remove the positive crankcase ventilation (PCV) valve at the cylinder head valve cover. Clean the PCV valve grommet in the valve cover of any oil residue. 2. Remove the breather hose from the air cleaner assembly and seal off the breather hose going to the cylinder head valve cover. 3. Attach a gauge that reads both pressure and vacuum (+/- 10 in. Hg.). 4. Start the engine and observe gauge readings. If the intake manifold pan gasket is leaking, then a vacuum reading greater than -2 in. Hg. will be observed. If no internal leaks are present, then the gauge will read near zero to slightly positive pressure. If a the pan gasket is leaking then perform the Repair Procedure. Parts: For the 5.2L / 5.9L: 1 04897383AC Package, Intake Manifold Gasket 1 05017208AA Gasket, Intake Manifold Plenum Pan 15 06034583 Screw, Intake Manifold Plenum Pan 1 53030541 Gasket, Throttle Body For the 3.9L: 1 04897382AC Package, Intake Manifold Gasket 1 05017207AA Gasket, Intake Manifold Plenum Pan 14 06034583 Screw, Intake Manifold Plenum Pan 1 53030541 Gasket, Throttle Body repair: 1. Refer to the appropriate year Service Manual, Section 9: ENGINE for removal and installation instructions. NOTE: CLEAN ALL OIL FROM THE INTERIOR SURFACES OF THE PLENUM PAN AND PLENUM CHAMBER. NOTE: THE PROPER TORQUE AND TIGHTENING SEQUENCE MUST BE FOLLOWED WHEN TIGHTENING BOTH THE PLENUM PAN SCREWS AND THE INTAKE MANIFOLD SCREWS. Notes: POLICY. Reimbursable within the provisions of the warranty. TIME ALLOWANCE: Labor Operation No: 09-50-15-91 ......................................................... 3.0 Hrs. 09-50-15-60 ..........................................

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