Question about Jeep Grand Cherokee
Code 27 indicates a badinjector(s) OR a bad computer if you are VERY technicaly involved youneed to get a service manual and follow the code to its end if not thenyou need a pro to take over. first you need to identify whichcylinder(s) are misfiring the SAFEST way for a novice is to disconnecteach injector wire 1 at a time with the engine running and whichevercylinder(s) don't cause the rpm's to drop are misfiring cylinders thenyou need a "noid" light for your particular injector connector, thereare several types and are available at most larger autoparts stores youSHOULD have a bosch style connector, install the noid light in the harness at the injectorend and watch the light it should blink rapidly if it dosen't blinkthen you need to check the wiring with an ohm meter (digital only) for shorts and/or open circuits from the engine computer to the injector(s) if they are ok then the engine computer is at fault do not use a used computeras many jeeps had factory alarms and that once activated is stored inthe engine computer and CANNOT be deactivated. if you are notcomfortable working around the computer and cannot get a service manualthen goto a pro it will cost you less in the long run.
If you wish, you can buy a cost effective repair manual :-
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Posted on Jun 17, 2009
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Posted on Jan 02, 2017
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