i have a 93 lumina,the problem started out just hard starting, it would run fine on 1993 Chevrolet Lumina

but then started dying when stopping,, i changed spark plugs and that made it worse

Asked by for the 1993 Chevrolet Lumina
1 answer
If the engine cranks over the battery and starter are most likely OK. Keep in mind an engine must crank over sufficiantly fast enough for the engine to suport combustion and run. The engine needs three things to start, fuel (gasoline), ignition (spark) and mechanical integrity (it must develop compression in each cylinder to start ie mechanical components must be in synchronization with each other. If it had run well previous to this no start condition chances are the engine is well mechanically.If the engine had run rough, driven poorly, made unusual noises, "ran hot", or switched off while driving the problem may actually be mechanical. Start with the basics and make sure the engine has strong and even compression, engine creates adaquate vacuum ect.... Had the Check Engine light been on? Check to see if the engine has "lost" spark or fuel which could be due to any one of a number of sensors having failed or the fuel pump or related components are not delivering fuel to the fuel injectors. The engine uses many sensors to report engine temperature, air flow into the engine, crankshaft and crank shaft position sensors to allow the computer in your car to make calculations controlling fuel and spark to the cylinders. It is hard to speculate without being able to hear the engine crank over and do some preliminary tests to determine the cause of your no start condition. Start with the basics check for even compression and make sure there are no vacuum leaks.There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online