Why isn't the fuel getting to the injectors but it is to the fuel rail?
First things first, what makes you sure the injectors are not firing?? Second is the Security light in the instrument cluster on? Explain what your situation is please, this could be anything from a ground wire to the ECM which by the way controls injectors on this Chevrolet but there are many things to look at to determine the answer you seek my car is not fueling. So lets start with the engine size is it automatic trans or manual what is the mileage of the auto also thanks. And what happened to get you in the situation of the car not starting like i was in the store came out it just did not start (example) thanks.
SOURCE: 2001 Chevy Malibu, 89,000 miles, 3.1 engine, won't start
CLICK HERE for the injector schematic.
CLICK HERE for the Ignition schematic.
Since the PCM uses info gatheres from the crank and cam sensors to calculate ignition - and there are no OBD codes - in all likelihood, the PCM itself is bad.
The Ignition Module, also transmits to the PCM.
It appears after all your testing - that the PCM is at fault.
It does not error report on itself (unfortunately).
The ignition timing is controlled by the Powertrain Control Module (PCM). No adjustment is necessary (distributorless ignition) or possible.
Please see the following....
The ignition timing is controlled by the Powertrain Control Module (PCM). No adjustment is necessary or possible.
The engines covered by this manual are equipped with distributorless ignitions, ignition timing is controlled by the Powertrain Control Module (PCM), as applicable. No adjustments are possible. If ignition timing is not within specification, there is a fault in the engine control system. Diagnose and repair the problem as necessary.
Ignition timing is the measurement, in degrees of crankshaft rotation, of the point at which the spark plugs fire in each of the cylinders. It is measured in degrees before or after Top Dead Center (TDC) of the compression stroke.
Ideally, the air/fuel mixture in the cylinder will be ignited by the spark plug just as the piston passes TDC of the compression stroke. If this happens, the piston will be at the beginning of the power stroke just as the compressed and ignited air/fuel mixture forces the piston down and turns the crankshaft. Because it takes a fraction of a second for the spark plug to ignite the mixture in the cylinder, the spark plug must fire a little before the piston reaches TDC. Otherwise, the mixture will not be completely ignited as the piston passes TDC and the full power of the explosion will not be used by the engine.
The timing measurement is given in degrees of crankshaft rotation before the piston reaches TDC (BTDC). If the setting for the ignition timing is 10 BTDC, each spark plug must fire 10 degrees before each piston reaches TDC. This only holds true, however, when the engine is at idle speed. The combustion process must be complete by 23° ATDC to maintain proper engine performance, fuel mileage, and low emissions.
As the engine speed increases, the pistons go faster. The spark plugs have to ignite the fuel even sooner if it is to be completely ignited when the piston reaches TDC. Spark timing changes are accomplished electronically by the engine and ignition control computers.
If the ignition is set too far advanced (BTDC), the ignition and expansion of the fuel in the cylinder will occur too soon and tend to force the piston down while it is still traveling up. This causes pre ignition or -knocking and pinging-. If the ignition spark is set too far retarded, or after TDC (ATDC), the piston will have already started on its way down when the fuel is ignited. The piston will be forced down for only a portion of its travel, resulting in poor engine performance and lack of power.
Timing marks or scales can be found on the rim of the crankshaft pulley and the timing cover. The marks on the pulley correspond to the position of the piston in the No. 1 cylinder. A stroboscopic (dynamic) timing light is hooked onto the No. 1 cylinder spark plug wire (2.2L engine only, on the 2.4L engines, special adapters are needed) . Every time the spark plug fires, the timing light flashes. By aiming the light at the timing marks while the engine is running, the exact position of the piston within the cylinder can be easily read (the flash of light makes the mark on the pulley appear to be standing still). Proper timing is indicated when the mark and scale are in specified alignment.
WARNING
When checking timing with the engine running, take care not to get the timing light wires tangled in the fan blades and/or drive belts.
The engines covered by this manual are equipped with distributorless ignitions, ignition timing is controlled by the Powertrain Control Module (PCM), as applicable. No adjustments are possible. If ignition timing is not within specification, there is a fault in the engine control system. Diagnose and repair the problem as necessary.
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SOURCE: 2000 malibu starts & then shuts off
are your injectors being fired by the computer.remove one of the injector connectors and using a low impedance test light or a small dash light bulb check for pulse or blinking light while cranking.
SOURCE: fuel rail presure on a 2001 trailblazer
If it's CPI it should be about 58-62 to thereabouts. Much lower than that she aint gonna start. TBI, however is in the low teens and I don't think has as many no start isues.
SOURCE: the car is getting spark.
there are a few things that could cause the car to have spark and no injection pulses, the first thing to check is the TPS voltage, if the TPS is over 4 volt with the key on the ECM will put the fuel system in clear flood mode. ( like we used to do on the old carb cars when they flooded we would have to hold the gas peddle on the floor to clear the flood ) modern cars have the same feature if you hold the gas peddle on the floor and the ECM see's TPS over 4 volt and no engine RPM then the ECM turns off the fuel injectors to allow the engine to clear a flooded condition, so if the TPS is reading over 4 volt when you are trying to start the engine the ECM will turn off the injectors. so test the TPS and make sure it is reading around .5 volt with the throttle closed.
also you stated that you replaced the cam sensor, on this model the cam sensor is used to trigger #1 cylinder to set up the firring sequence for the ignition, the crank sensor is used to trigger te fuel injection system.
best guess is the crank sensor is bad, it is located on the back of the engine, just above the oil pan flange around 3 in in frount of the bell housing.
test the TPS if it is around .5 volts then replace crank sensor, if TPS is over 4 volts then replace the TPS sensor.
GOOD LUCK let me know if there is any thing else i can do for you.
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