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1999 1500 service engine soon light question

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  • 1999 1500 service engine soon light question

    Last nite I was driving home from work( 1999 silverado 1500 Z71 4wd) when my truck started acting funny and boggin down and the engine was sputtering so i pulled into a driveway and shut it off. then when i went to start it,it wouldnt start so i went got some gas put it in it the it finally started up. Now my service engine soon light is on and its the first time that light has came on since ive owned the truck. any ideas what it could be? any help would be greatly appreciated
    1999 silverado 1500 6" skyjacker, 3" BL 37x12.50 PJ's, 4.8 liter vortec

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  • #2
    Re: 1999 1500 service engine soon light question

    I believe OBD-2 has about 1000+ codes that list the possibilities. Without knowing what fault the computer is seeing, I'd propose that many of those as possible ideas. Best first step is to read the trouble code(s) from the PCM and start from there. Many parts places will read trouble codes for free in the hopes of selling you parts.
    '98 K1500 Suburban LS rear ARB
    '92 Ford Explorer XLT 4x4

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    • #3
      Re: 1999 1500 service engine soon light question

      thanks . i stopped in to autozone and the guy pulled a code sayin multiple cylinders misfiring. He said that often times when you run out of gas itll throw that code so after i drive it around for a day or so to let the air get out of the system i can reset the code. hopefully thats all it is.
      1999 silverado 1500 6" skyjacker, 3" BL 37x12.50 PJ's, 4.8 liter vortec

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      Max size is 500 x 200 at FSC.com

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      • #4
        Re: 1999 1500 service engine soon light question

        well i went outside and unhooked the battery for 30 minutes, went back out and rehooked it and the service light is still on. I really dont want to take it to the dealer and the truck seems to be running fine so does anybody else have any suggestions?
        1999 silverado 1500 6" skyjacker, 3" BL 37x12.50 PJ's, 4.8 liter vortec

        ****Image removed by staff****
        Max size is 500 x 200 at FSC.com

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        • #5
          Re: 1999 1500 service engine soon light question

          you need to check for codes again and see if its the same one. is it running fine now?i know that when ive ran my truck low enough on fuel that the computer goes to limp mode resulting in taking away cylinder fire to a couple cylinders or something?? anyways its suppost to let you know to get fuel quick dumba$$!!this hasent ever turned on my service light though, you may have a different problem, either way its either fuel or spark.if its running fine now and hasent acted up with the same problem it may have been a fuel issue. have you checked the simple ****? fuel filter, regulator, fuel pressure?
          1999 reg cab shortbox z71

          285/75/16 pro comps

          gov bomb limited slip

          flowmaster exhaust

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          • #6
            Re: 1999 1500 service engine soon light question

            How long has it been since it's had a tune up.
            Take your spark plugs out and see what they look like. Also look at your spark plug wires, if you have a multimeter you can check the resistance.
            If you run out of gas it doesnt' take days to get the air out of the system. Everytime I do a fuel filter on mine, it fires right up.


            03 Silverado ECSB, Dmax, Allison, 3.73 G80
            96 Silverado ECSB, 350, 4L60E, 3.73's Powertrax Locker
            05 Cavalier
            74 Corvette Stingray, 350, 4 speed
            49 F-1, flathead 6, 4 speed, 2wd, unknown rear end. Old rust bucket.

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            • #7
              Re: 1999 1500 service engine soon light question

              okay ill check those out. just replaced the fuel filter a couple months ago so i dont think it would be that. may change the plugs and wires, its been a while so that could be it. ill take it back and have them check the code again and see if something else comes up. thanks for the help guys
              1999 silverado 1500 6" skyjacker, 3" BL 37x12.50 PJ's, 4.8 liter vortec

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              Max size is 500 x 200 at FSC.com

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              • #8
                Re: 1999 1500 service engine soon light question

                ok just got back from autozone again. its showing P0300, which says the causes could be a fault in the ignition system or high or low fuel pressure. I bought plugs and wires to try it out but im gonna put the pressure gauge on it tomorrow to test it out. Anyone know what the pressure is supposed to be?
                1999 silverado 1500 6" skyjacker, 3" BL 37x12.50 PJ's, 4.8 liter vortec

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                Max size is 500 x 200 at FSC.com

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                • #9
                  Re: 1999 1500 service engine soon light question

                  Im not positive but im thinking its 9-13 psi

                  1994 Chevy-Sold
                  1996 Chevy-Sold.
                  1991 Nissan 240sx-Rb25det engine swap, lots of goodies.

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                  • #10
                    Re: 1999 1500 service engine soon light question

                    If I remeber right it should be 55-60. Something right around their.


                    03 Silverado ECSB, Dmax, Allison, 3.73 G80
                    96 Silverado ECSB, 350, 4L60E, 3.73's Powertrax Locker
                    05 Cavalier
                    74 Corvette Stingray, 350, 4 speed
                    49 F-1, flathead 6, 4 speed, 2wd, unknown rear end. Old rust bucket.

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                    • #11
                      Re: 1999 1500 service engine soon light question

                      ok ill put the pressure gauge on tomorrow after i change the plugs and wires out. Im hopin it fixes it cause id rather not change out the other stuff because those look like they could get expensive. thanks for the help
                      1999 silverado 1500 6" skyjacker, 3" BL 37x12.50 PJ's, 4.8 liter vortec

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                      Max size is 500 x 200 at FSC.com

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                      • #12
                        Re: 1999 1500 service engine soon light question

                        well just put the pressure gauge on and tried it a couple times. I got right around 55 each time so that doesnt look like its a problem. Im gonna change the plugs and wires out next and see if that helps
                        1999 silverado 1500 6" skyjacker, 3" BL 37x12.50 PJ's, 4.8 liter vortec

                        ****Image removed by staff****
                        Max size is 500 x 200 at FSC.com

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                        • #13
                          Re: 1999 1500 service engine soon light question

                          Did you just check running press?
                          I should have told you before but,
                          You should check with key on engine off. Shows the prime. That should stay close. It may drop, but it shouldn't be a lot. I think 5 or 10 psi in 10 mins.
                          And obviously check with the engine running.
                          If your fuel pressure drops with the engine off, check your FPR.
                          If that isn't the problem then, it could be leaking injectors.


                          03 Silverado ECSB, Dmax, Allison, 3.73 G80
                          96 Silverado ECSB, 350, 4L60E, 3.73's Powertrax Locker
                          05 Cavalier
                          74 Corvette Stingray, 350, 4 speed
                          49 F-1, flathead 6, 4 speed, 2wd, unknown rear end. Old rust bucket.

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                          • #14
                            Re: 1999 1500 service engine soon light question

                            I was in a hurry the other day and check it with the key on engine off, it showed 55. When it gets above 5 degrees here sometime ill go out and check it again with the engine running lol.. too cold out for me
                            1999 silverado 1500 6" skyjacker, 3" BL 37x12.50 PJ's, 4.8 liter vortec

                            ****Image removed by staff****
                            Max size is 500 x 200 at FSC.com

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                            • #15
                              Re: 1999 1500 service engine soon light question

                              well i put the fuel pressure gauge on today and started it up. didnt drop too much. i changed the plugs and wires out and turned it on and the light is still on. could one of the coil packs need replaced? thats what the guy at autozone said, how would i check those to see if they are?
                              1999 silverado 1500 6" skyjacker, 3" BL 37x12.50 PJ's, 4.8 liter vortec

                              ****Image removed by staff****
                              Max size is 500 x 200 at FSC.com

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