Question about 1997 Chevrolet C1500

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1997 chevrolet C1500 pickup with a 5.7 liter (VIN code R). The engine cranks but will not start. I have tested the fuel system with a fuel pressure test gauge at the fuel rail and get a 40 PSI read

The engine cranks but will not start. I have tested the fuel system with a fuel pressure test gauge at the fuel rail and get a 40 PSI reading. I have tested for spark at the spark plugs and they are firing.I have removed the injector harness connector located in the middle of the intake manifold and attached a noid light to each individual injector circuit and the noid light blinked every time the engine was cranked. Could the whole injector (Spider) assembly be defective or should some of the injectors be spraying fuel. What should be the next step to diagnose the no start problem? Details

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  • Chevrolet Master
  • 314 Answers

As your request requires detailed information to extensive for this forum please follow the link provided below.
Second Generation CSFI
Here is some detailed information for you to look over concerning the
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GMC Chevy Light Truck Central Port Fuel Injection Diagnosis

Posted on Apr 18, 2017

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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blueextc3221
  • 15935 Answers

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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Posted on Aug 18, 2009

  • 288 Answers

SOURCE: 2000 chevy montecarlo 3.4L, Engine cranks but dont start.

hook up vac gauge and test cranking vacumm should be at least 3 to 5 inches while cranking if not suspect plugged cat converter or timming jumped also check compresson that will tell you whatz up .

Posted on Jan 31, 2010

csmock132
  • 4669 Answers

SOURCE: I have an 89 Chevy

Does it even try? Spit and sputter? Start and die? Or does it not even fire? Fuel pressure is a little low but it should start with 9 psi.

Posted on Sep 25, 2010

  • 1243 Answers

SOURCE: I have a 2003 Chevy

you may need to check the compression. if the plugs have fuel on them and you know the spark is good then the only thing missing for the car to run is the compression. if all the cylinders have low compression then the car has jumped time most likely.

Posted on Aug 08, 2011

  • 3799 Answers

SOURCE: 1992 C1500 w/5.7 engine won't start

Have you checked the "Bump Switch" this is a small inertia switch which turns offf the fuel pump to prevent it running in the event of an accident. They are usually mounted in the boot(trunk/load area) . There should also be one mounted under the front of the vehicle to initiate the Airbags. They usually cut the earh return(at least it does on my Granada, XR3i and Sierra XR4x4) hope this helps.

Posted on Feb 09, 2012

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1992 C1500 w/5.7 engine won't start


Have you checked the "Bump Switch" this is a small inertia switch which turns offf the fuel pump to prevent it running in the event of an accident. They are usually mounted in the boot(trunk/load area) . There should also be one mounted under the front of the vehicle to initiate the Airbags. They usually cut the earh return(at least it does on my Granada, XR3i and Sierra XR4x4) hope this helps.

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