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I replaced the batt. and starter and my car still wont start.anyone know why
2004 Dodge Intrepid

I replaced the batt. and starter and my car still wont start.anyone know why

(2004 Dodge Intrepid)
this car has sit for a year but ran fine when it was parked.i have also checked and seen all 6 plugs spark.it cranks like it suppose to but just wont fire up
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of Greg Solow's Engine Room on September 27, 2011
An engine needs three things to run mechanical integrity fuel and spark. The computer in your car takes in readings from sensors on the engine (like crank shaft position, camshaft position, engine coolant temperature, air temperature, volume of air being drawn into the engine, ect...) based on these inputs the computer in your car determines how much fuel to squirt into the engine and when to send spark to set fire to the fuel. If any engine sensor is giving an erroneous reading the computer does not make proper calculations and drvability issues occur. In most cases theses sensor values are needed to "turn on" the fuel pump. If the Check Engine/Service Engine Soon light is on there will be a code stored in the memory of the computer of your car that will indicate where the problem is or at least where to start looking. Even if the light is not on a professional grade scan tool attached to a 16 pin diagnostic socket under the dash of your car will be able to look at live sensor data so a mechanic can determine if sensor inputs to the computer in your car are correct and the computer outputs are correctly controlling fuel and spark. Using a scan tool to examine each sensor can eliminate have to to do intrusive testing at each sensor and also checks to a certain degree the integrity of the wiring harness of your car. 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. 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.Check for fuel pressure (you will need a fuel pressure gauge and look up the specified fuel pressure for your vehicle). Remove the fuel hose that goes to the fuel rail and get a friend to crank over the engine to see you have adequate fuel volume (you should have approximately 1 pint of gasoline in ten seconds of cranking). Off course take proper precautions as gasoline is highly flammable. heck for spark at the spark plug when the engine is being "cranked over", next "listen" to the fuel injector. Using a mechanic's stethoscope (or use a long screw driver placing the handle end up to your ear place the metal tip end of the screwdriver against the body of the fuel injector), get a friend to crank over the engine while you "listen" to the fuel injector listen to each injector at the same point of the injector body. You should hear "click, click, click" as the injector is electrically opened and closed by the computer. If the injector is not being triggered you will not have fuel getting into the engine's cylinders. Disconnect the electrical connector at the fuel injector with the ignition key in the "on" position, (next position after the accessory position) you should have 12 volts at one of the two wires at the injector. This true for most vehicles but you need to consult a workshop manual for your vehicle to see that this is true for your vehicle. When the engine is running the second wire at the injector gets (triggered) grounded by the computer in your vehicle many times a second controlling exactly when and how much fuel gets injected into the engine. 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
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of Greg Solow's Engine Room on September 27, 2011
An engine needs three things to run mechanical integrity fuel and spark. The computer in your car takes in readings from sensors on the engine (like crank shaft position, camshaft position, engine coolant temperature, air temperature, volume of air being drawn into the engine, ect...) based on these inputs the computer in your car determines how much fuel to squirt into the engine and when to send spark to set fire to the fuel. If any engine sensor is giving an erroneous reading the computer does not make proper calculations and drvability issues occur. In most cases theses sensor values are needed to "turn on" the fuel pump. If the Check Engine/Service Engine Soon light is on there will be a code stored in the memory of the computer of your car that will indicate where the problem is or at least where to start looking. Even if the light is not on a professional grade scan tool attached to a 16 pin diagnostic socket under the dash of your car will be able to look at live sensor data so a mechanic can determine if sensor inputs to the computer in your car are correct and the computer outputs are correctly controlling fuel and spark. Using a scan tool to examine each sensor can eliminate have to to do intrusive testing at each sensor and also checks to a certain degree the integrity of the wiring harness of your car. 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. 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.Check for fuel pressure (you will need a fuel pressure gauge and look up the specified fuel pressure for your vehicle). Remove the fuel hose that goes to the fuel rail and get a friend to crank over the engine to see you have adequate fuel volume (you should have approximately 1 pint of gasoline in ten seconds of cranking). Off course take proper precautions as gasoline is highly flammable. heck for spark at the spark plug when the engine is being "cranked over", next "listen" to the fuel injector. Using a mechanic's stethoscope (or use a long screw driver placing the handle end up to your ear place the metal tip end of the screwdriver against the body of the fuel injector), get a friend to crank over the engine while you "listen" to the fuel injector listen to each injector at the same point of the injector body. You should hear "click, click, click" as the injector is electrically opened and closed by the computer. If the injector is not being triggered you will not have fuel getting into the engine's cylinders. Disconnect the electrical connector at the fuel injector with the ignition key in the "on" position, (next position after the accessory position) you should have 12 volts at one of the two wires at the injector. This true for most vehicles but you need to consult a workshop manual for your vehicle to see that this is true for your vehicle. When the engine is running the second wire at the injector gets (triggered) grounded by the computer in your vehicle many times a second controlling exactly when and how much fuel gets injected into the engine. 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
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