Question about Chevrolet 1500

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I have a 98 silverado 5.7 vortec 350. So i was misfiring on a cylander so i changed all plugs wires distributer cap and rotor button. worked out good. fixed that then it started having trouble starting about 3 days later. 5 or 6 trys and it would start at first. this went on for 2 days. then i woke up and today it wont start at all. turns over strong but wont start. I can hear the fuel pump kick on. It did this last winter then just stopped. I figured it was a clog in the fuel system because it never did it again. now a year later it seems to be the same issue.

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  • jj_holt66 Nov 13, 2010

    ill give it a try

  • jj_holt66 Nov 13, 2010

    ok so i tried the fuel filter. that was a no go. same issue. any more ideas?

  • jj_holt66 Nov 13, 2010

    changed the fuel filter and still no luck.

  • jj_holt66 Nov 13, 2010

    i hear ya on the plugs. thats all i go with. Ill check the pressure and get back to you. Thanks.

  • jj_holt66 Nov 13, 2010

    alright so i checked the fuel pressure and its reading around 45-48. i think its supposed to be 55 am i right on that? so you tell me what this means.

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  • Chevrolet Master
  • 8,215 Answers

45 psi is enough to start the truck. I assume you measured that at the schrader valve on the fuel rail. Have you tried squirting gas or starting fluid straight into the air horn?
If it will fire when doing this, your injectors are not releasing the gas in the fuel rail.
Check injector solenoid operation by holding a long screwdriver to an injector, put the other end to your ear while someone cranks the engine. There should be a regular click. If there is clicking, the injectors are probably clogged. If no clicking, there is a problem with the cam position sensor or the ECM.

If it will not fire with starting fluid, the problem is not fuel supply. First check the 20 amp ECM-1 fuse. If OK, check for spark by pulling the coil wire off the distrubutor and holding it close to engine ground while someone cranks the engine. Sparks should jump to the engine. If not, check for power to the coil--take connector off coil, connect a 12 volt test light to engine ground and probe the coil connector terminal with the pink wire while someone cranks the engine. If there is power to the coil but no spark, the problem is with the crankshaft position sensor, coil driver, or the ECM.

If there is no power to the coil, the problem is likely the ignition switch.

If it willl not fire with starting fluid and there is spark from the coil wire, the problem may be timing. If you get to this point, I recommend testing or replacing the crankshaft position sensor. The sensor is on the front right corner of the engine block. The part is $60, so you may want to test it first. Here are test procedures from autozone.com:

  1. Disconnect the CKP sensor harness. Connect an LED test light between battery ground and CKP harness terminal A.
  2. With the ignition ON and the engine off, verify that the test light illuminates.
  3. If not as specified, repair or replace the fuse and/or wiring.
  4. Carefully connect the test light between CKP harness terminal A and B. Verify that the test light illuminates.

I have a 98 silverado - jturcotte_166.gif

Fig. Fig. 2: Crankshaft Position (CKP) sensor wiring diagram

  1. If not as specified, repair the CKP harness ground circuit (terminal B).
  2. Turn the ignition OFF and disconnect the test light.
  3. Next, connect suitable jumper wires between the CKP sensor and CKP sensor harness. Connect a duty cycle meter to the jumper wire corresponding to CKP terminal C and battery ground.
  4. Crank the engine and verify that the duty cycle signal is between 40-60%.
  5. If it is not as specified, the CKP sensor may be faulty.
  6. Next, connect a AC volt meter to the jumper wire corresponding to CKP terminal C and battery ground.
  7. Crank the engine and verify that the AC voltage signal is at least 10.0 volts.
  8. If not as specified the CKP sensor may be faulty.

Please let me know if you have any questions. I will past the wiring diagram below.

jturcotte_167.gif

Posted on Nov 14, 2010

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AC Delco plugs are critical in these engines. Others will work fine but will trigger a check engine light (P0300 random misfire). Test the fuel pressure and get back to me. There should be a schrader valve to make this very easy. Just because you hear the pump, does not mean it has any pressure. Let me now.

Posted on Nov 13, 2010

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  • Chevrolet Master
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Have u changed the fuel filter.if not this is agood cheap place to start and it wil lnot hert if it dose not fix it but i am thinking u have a little water in the filter. hope this helps

Posted on Nov 13, 2010

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