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is their fuel or is fuel pump working --why was battery changed was old one tested and found bad --check fuel system if vehicle starts with starter fluid then you have a problem with fuel supply ---if fuel ok and doesnt stark problem with ignition system
My routine to check non-starting motors: (petrol/gas models)
Check immobilizer status
Check fuel supply -does it reach the fuel rail when starting. If not OK, check 12v supply to fuel pump when starting. If OK, fuel pump maybe dead.If not present, check fuel pump fuse and relay.
If fuel supply is OK, check spark ignition. If not OK, follow the supply circuit backwards to the ECM. Coils and/or ignition amplifier connector should have one 12v supply to it when ignition switch is on.
For Diesels with 'common rails' you can take same approach for fuel. No ignition testing possible. The diesel fuel pump still needs battery power. It will make some sound when IGN is on. If not, check ALL fuses and relays.
if all you did was this...and and put a new battery in and still wont start...if you have went thru your plugs..wires..distributor..ignition coil...made sure your getting spark..if not..check your relays and fuses..preferebly one that deals with spark and timing for injectors..if everything is fine to that point...then try a crankshaft position sensor...it tells the pcm timing for fuel injectors and fire to the ignition coil...hopefully this helps.
Look towards: Fault in the fuel injector sysytem; Battery termional connections corroded or loose; excessive moisture on the ignition components; fuel pump faulty/ fuel filter clogged/ bad fuel in tank; worn faulty or incorrectly gappped spark plugs; broken, loose or disconnected wires at the distributor/ ignition coil pack.. Please provide feedback Best regards Ck
if car wont start.make sure your battery volts are 12.5.if not charge battery.or replace it if dont hold a charge.if battery is good engine wont turn over.make sure battery cables is clean and tight if all good no start .have starter and starter solenoid check.if battery and starter is good.check for fuel .has some one turn ignition to the on position.go to rear of car listen for fuel pump noise.if your hear fuel pump check ignition system for spark.go to auto parts place buy a spark tester.if you get no spark .check .ignition fuses and ignition module.if you hear no fuel pump.replace relay or fuse.if if fuse and relay good replace fuel pump.if every thing good .your car could have crank sensor problem. or your car is in theft deterrant mode.if so have your car towed in and scanned.