fiatslug87 Posted May 24 Share Posted May 24 CRUISER'S MOSTLY RENIX TIPS 4.0L ENGINE DATE CODES The date code is on the passenger side of the engine, on the block, just forward and up from the distributor on a machined flat surface. The digits of the code identify: 1st Digit-The year (8 = 1998). 2nd & 3rd Digits-The month (01 – 12). 4th & 5th Digits-The engine type/fuel system/compression ratio (MX = A 4.0 Liter (242 CID) 8.7:1 compression ratio engine with a multi-point fuel injection system). 6th & 7th Digits-The day of engine build (01 – 31). FOR EXAMPLE: Code * 801MX12 * identifies a 4.0 Liter (242 CID) engine with a multi-point fuel injection system and 8.7:1 compression ratio that was built on January 12, 1998. Revised 1-31-2016 Link to comment Share on other sites More sharing options...
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