Engine cranks over but wont start, can hear fuel pump and have with the key on 60to64psi on fuel pressure guage have spark from coil to dis. and to plugs and have tested ing. module (good) and new cam shaft postion sensor and new crankshaft postion sensor and new fuel pump relay. maybe 60,000 miles on GM reman. long block in pickup with maybe 150,000 plus miles on truck that ran fine driving to work all week until friday when parked then on monday wont start.also tried giving a shot of starter fluid thru filter housing while cranking engine overand it seemed to try to start but not.driving me crazy hope someone can help Thanks
My truck did this after I replaced the fuel pump. Turned out to Fuel Pressure Regulator. It would crank and crank but never start. It's located underneath the black plastic manifold on the side of the injectors.
What is the outside temperature there? I have had very hard time starting my 98 chevy when temps are in the single or negative digits, especially after sitting. The battery just does not have enough cranking amps at those temps. The truck sounds like it cranks fine but when you watch the volt gauge on the dash it dips close to the red area while cranking. I have replaced my battery and my truck starts fine now. i still think I need to replace my battery cables. I would suggest cleaning cables and boosting the battery while trying to start. I know this sounds too simple but it is easy to try. The computer will not function with low voltage.
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The things to check are: is the engine still getting fuel and spark. Do you hear the fuel pump buzz on for 2 seconds with key in on? It has to turn on for 2 seconds to prime the lines and fuel rail on the engine-where the injectors sit. A fuel pressure gauge could be hooked up to test the fuel pressure, with key on. No pressure means the pump is not working right, not coming on. Either the pump has gone out, or the fuel pump circuit has a problem.
If gas is getting to the engine, then check for spark on a spark plug wire. No spark when cranking the engine over means there is a problem in the ignition system- spark plugs, plug wires, ignition coils (the coil pack), ignition control module, the pcm, the crankshaft position sensor-all of these components need to be checked. Buy a cheap spark tester and start there.
Try to determine if it is fuel or ignition related.
Turn key to on, do you hear the fuel pump turn on for a couple of seconds? It should come on briefly to pressurize the lines and fuel rail on the engine. Do you have fuel at the engine under pressure? Easiest and preferred way is to check fuel pressure with a pressure gauge at the test port on the fuel rail. With key on, pressure on mpfi systems should be 40-50 psi.
If there is gas in the fuel rail, test ignition by checking for spark on the end of a plug wire, with the engine cranking over. If you have a blue snapping spark, then ignition is probably good-may want to check more than one plug wire. Hold the metal terminal end of plug wire 1/4 inch from a ground on the engine, the engine block or a bolt or metal bracket. Verify a blue snapping spark, repeatedly, as the engine cranks. An orange spark, intermittent spark, or no spark points to an ignition problem. One thing you haven't changed is the ignition control module. This module, when signaled by the pcm, is what cuts the primary current to the coils for spark to be generated.
If you have both gas and spark, check the fuel injector circuit. Post back if you need help with that. There should be an injector fuse that needs checked. Also a fuse for the fuel pump, if no pump action, besides the fuel pump relay.
Need to find out if there is spark while cranking first. Check at the coil wire first then at a plug wire.If there is spark at the coil and not at the plug the fault is the rotor or dist. cap.If there is no spark at all,suspect the ign. module. If there is good spark move on to the fuel pressure check.It needs about 40 lbs. to run.
Code 12 is a "good" code-it means system normal. Since no codes are stored, check for spark and check for gas-is the fuel pump coming on? You should hear the pump buzz for a couple of seconds when you turn the key to on-it should start and pressurize the lines, then shut off until the engine is cranked-when cranking, pump should be running again. If you don't hear the pump, check if the fuel pump wire at the gas tank connector has power to it when the engine is cranking. If it does and the pump is not working, the pump will need replacing. If no power, check the fuel pump fuse and relay, under the hood. If the fuel pump is working, it may be ignition related-check for spark. You need to see a blue snapping spark to know the ignition system is good. If no spark, suspect the ignition control module or the crank position sensor -or the pickup coil, if no crank sensor. The pickup coil will be in the distributor-if you have one. If no distributor, crank position sensor is behind the crankshaft harmonic balancer. If fuel pump and spark are good, you will need to diagnose the injector circuit. Post back with what you find.
Probably the crank sensor, do you hear the fuel pump 'buzz' when you turn on the key (not cranking the engine, just key on)? If you do hear the fuel pump (only lasts about 2 seconds), it may be the ignition module, otherwise it is probably the crank sensor.
Fuel delivery must be confirmed with a fuel pressure gauge on this vehicle. Disconnecting the fuel line and cranking the engine to see fuel shooting out does not confirm pressure, it only confirms fuel delivery. Remember you need both fuel delivery and pressure. On this vehicle if the psi is off by just one number that's enough to keep it from starting. Also replacing the coil and rotor (as you stated) does not confirm that spark is reaching the plugs. Confirm that both spark and adequate fuel pressure are reaching ALL the spark plugs.
Please stop using the starting fluid, it is terrible for your engine- use choke cleaner if you need to do this in the future again. you can run it on choke cleaner indefinately if needed.
It sounds like your fuel pump quit on ya. When you turn the key to the "run" position do you hear the pump run in the tank for 3-5 seconds? you should. The fuel pump is in the gas tank and the tank has to be removed to acess it.
you can remove the coil wire from the coil and check to see if the coil is firing a spark. crank the engine with the wire off. make sure there is no starting fluid or choke cleaner fumes around before you do this-k? Carefull not to let it shock you. if it is sparking then you should check the fuel pressure. it should be 60psi while cranking the engine. you will need a fuel pressure guage to do this.