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1155 erratic misfire

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Jaycee

03-22-2001 19:12:08




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The engine misfires over rough terrain but is all right on smooth surfaces. Is this normal for a Massey? Do I still have air in the fuel system, do I need to replace my injectors, or do I need to rebuild my injector pump? Any help will be greatly appreciated




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taz1206

04-22-2001 15:53:33




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 Re: 1155 erratic misfire in reply to Jaycee , 03-22-2001 19:12:08  
HI, YOUR ENGINE MISFIRE COULD BE A NUMBER CAUSES,YOU SAY ROUGH TERRAIN? DO YOU MEAN UNDER LOAD? AND MAYBE YOU CAN'T HEAR IT AT AN IDLE/NO LOAD.SUPPLY FUEL PRESSURE MUST BE A CONSTANCE 5-10 PSI TO INJECTOR PUMP. IF NOT INJECTOR PUMP COULD CREATE SOME VACUUM IN FUEL LINES ,AND WITH LOOSE CONNECTIONS,BAD O-RINGS,IT COULD INTRODUCE AIR IN SYSTEM.AND AT IDLE ENGINE REQUIRES LESS FUEL MISFIRE DISSAPEARS.THE FIRST PIECE OF THE PROBLEM WOULD BE TO REMOVE INJECTORS ,CAREFULLY MARK THEM,TO WHICH CYLINDER. TAKE THEM TO BE CHECKED,OPENING PRESSURE,CHIRP,CHATTER,DRIBBLE,ETC.ANY RESPECTING EQUIPMENT DEALER SHOULD BE ABLE TO CHECK AND ADJUST TO SPECS. IF THAT DOESN'T DO THE TRICK TRY THE INJECTOR PUMP,YOU WILL HAVE TO SEND IT TO A SPECIALTY SHOP FOR REBUILD. LUCKTOYA, TAZ

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