Impala 2000, 3.8 litres cranks up but doesn't start
After getting a new battery and making sure gas was coming in nicely, I understand that sparks are not getting to the spark plugs to make the explosion happen. Problem is, I do not know where to look to find the defective part and replace it myself, as I'm in no condition to pay for towing and professional mechanic services. Can you help me? If so, my email is firstname.lastname@example.org Thanks a bunch.
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If the cat is not turning over with a new battery and new starter, make sure the starter is getting correct power. Impalas are tricky since it is front wheel drive. Be sure the cables connecting the starter are fully tightened or plugged in, and be sure it is grounded properly. If your interior gets power there is some issue going to the starter or coming from it to the engine. When you turn the key to start, does it have any sound coming from it?
Looks like you got spark, and gas in the throttle body made it fire: nice work.
Sounds like your fuel pump is out or the wiring is not turning it on. One way to be sure is to set a spare battery near the tank and hot wire the pump with jumper wires. Or if you have a voltmeter check for voltage at the fuel pump connector while the truck is cranking.. If the pump is working and getting gas to the engine, see if the injectors are pulsing. A good idea to check fuel pressure if the pump is working.
Check the timing and make sure the battery is good, the battery can sometime have the power to crank the engine but have internal problems that leave it without enough voltage to give you a hot enough spark to start the engine.
You could also have some bad ignition parts which could be shorting out your spark or sending it to the wrong spark plugs. Plus you could also have fouled spark plugs.
First thing I'd check is the optispark sub harness. Check both connections, the one by the optispark and the one on the passenger side of the intake manifold. Disconnect both sides and check for corrosion. This is a known weak spot on these motors.
If that checks out your going to want to start with the basics. Do you have spark and fuel? Pull the spark plug wire for a cylinder and using a spark tester test for spark while cranking. You want to have a nice blue spark. If you have good spark check for fuel pressure by hooking up a fuel pressure gauge to the shrader valve on the fuel rail. It should be in the high 40s - low 50s. If you have fuel also, check to make sure the injectors are getting a pulse using a noid light.
Does it crank? Do you have any codes? Check engine light? Do you have spark? No spark check coil, and connections, also it would be nice to know what year it is. Get codes read. No crank check battery and starter. No codes or lights check crank position sensor, make sure your pcm is good after replacing your ignition mod you could have blown it if you did do it right. (engine computer) Check cam sensor if applies. Crank and cam could prevent it from starting and I know one I think cam controls pcm's fuel delivery on gm's