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2002 Tahoe check engine light

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  • #438642
    silveralfasilveralfa
    Participant

      I have a 2002 Tahoe, 5.3 vortec, 100k miles, and I tow a 6,800 lb trailer with it mostly rather than just drive it around.

    Viewing 15 replies - 1 through 15 (of 27 total)
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    • #438646
      EricTheCarGuy 1EricTheCarGuy
      Keymaster

        RealFixesRealFast is excellent so defiantly check that out. In addition I’ve made a video that might help in a similar vehicle. I’m also going to link my power balance video to help nail down the effected cylinder(s)

        http://www.youtube.com/watch?v=bAOmUjAjNjE

        http://www.youtube.com/watch?v=WgrfT0LFMhc

        #438647
        silveralfasilveralfa
        Participant

          Thanks Eric. I watched those two videos of yours (again) and I got alot more out of them the second time. I tend to dread getting that deep into it and I will admit that I tend to jump to conclusions. the threshold thing that bugs me is that my car doesn’t seem to have an actual miss. After watching your videos I feel that is a little naive on my part. I will say I have taken long towing trips with this car since it has been doing this and I have another trip this next week. After i get back i shouldn’t need to use it for a few months so I will devote some time to it. Question: I watched you do the compression test on a suspected bad cylinder, but if you want to do the test on the whole engine do you pull all the coil pack connectors when you pull all of the plugs? Is there another way to assure you don’t get zapped by the dangling plug wires?

          #438648
          dreamer2355dreamer2355
          Participant

            Ignition misfires tend to happen under a load. The best way of isolating the cylinders is by a cylinder balance test as already posted above. You can do this via a good scan tool or by following the same practice Eric shows in one of his video’s.

            A good scan tool will also show you how many misfires each cylinder has had if you jump deep into the scan tools functions.

            You could possibly start diagnosing the issue your self by stress testing the ignition system by using a good brand adjustable spark tester. I would also be looking at fuel pressure issues as well as vacuum leaks. Again the correct tools will make diagnosis alot easier.

            For the compression test, just complete one cylinder at a time. I would pull the fuel pump fuse so the vehicle will not run nor flood the engine of raw fuel.

            Hope this helps.

            #438649
            jacobnbr1jacobnbr1
            Participant

              P0300 is random missfire detected and the flashing mil light is because it is catalyst damaging meaning the only thing missing is the lean codes of p0171 and 174 before total meltdown of the cats.
              You need to check the fuel trims and find out how far out they are and then check for confirmation with propane around the intake manifold gaskets.

              #438650
              pcmdjasonpcmdjason
              Participant

                Yeah I like the high tech stuff he has .

                Here’s another one to look at:

                http://www.youtube.com/watch?v=CR32Lpt6 … re=related

                Quoted From silveralfa:

                Thanks for your input, That guy at real fixes is an amazing tech. My car shows by the code it is misfiring but there has never been a running problem. I have never felt it misfire.

                #438643
                pcmdjasonpcmdjason
                Participant

                  I would start with this video from RealFixesRealFast.

                  http://www.youtube.com/watch?v=zHKczFZcXwA

                  #438644
                  Matt BrandsemaMatt Brandsema
                  Participant

                    It could be a voltage leak. Those seem to pop up when ever the engine is under load, such as in towing.

                    #438645
                    silveralfasilveralfa
                    Participant

                      Thanks for your input, That guy at real fixes is an amazing tech. My car shows by the code it is misfiring but there has never been a running problem. I have never felt it misfire.

                      #438651
                      EricTheCarGuy 1EricTheCarGuy
                      Keymaster

                        Here is a link to the compression test video.

                        http://www.youtube.com/watch?v=X_tbksFYhl4

                        #438652
                        silveralfasilveralfa
                        Participant

                          The results of checking the power balance are that there is no difference between cylinders. When each coil connector is removed there is a skip created that goes away when I put the connector is replaced. Question: how do i check my fuel trims?

                          #438653
                          pcmdjasonpcmdjason
                          Participant

                            Fuel trim can be read from a real-time ODBII scan tool that can display live engine data.

                            I have a video myself on reading live data on an engine here:

                            http://www.youtube.com/watch?v=d0ucS4RydkA

                            And here’s a video from realfixesrealfast that talks about how fuel trim works.

                            http://www.youtube.com/watch?v=mzsOY_AhgY4

                            Quoted From silveralfa:

                            The results of checking the power balance are that there is no difference between cylinders. When each coil connector is removed there is a skip created that goes away when I put the connector is replaced. Question: how do i check my fuel trims?

                            #438654
                            johnzcarzjohnzcarz
                            Participant

                              I

                              #438655
                              Shaun_300Shaun_300
                              Participant

                                Can you actually feel the misfires and the engine running bad? It may be as simple as having a crankshaft variation relearn done. I had a 2005 2500HD in the shop this morning with a P0300, when the RPM’s got over 2700 or so it’d say about 4 cylinders were missing like crazy, couldn’t feel any misfire whatsoever. I did a crankshaft relearn on the Tech 2 and the problem was solved. Crank sensor must have been out of sync just enough to think it was misfiring when it really wasn’t. Might be something to have done before throwing parts at it. If it still is throwing codes after that, then continue diagnosing the problem.

                                #438656
                                silveralfasilveralfa
                                Participant

                                  thanks Shaun. I can not feel any misfires and the engine is not running bad at all. I have never heard of a crankshaft relearn before, but that sounds interesting. Is that to do with mechanical age like timing chain? I assume that I can not do this relearn myself.

                                  Thanks pcmdJason My 1st scan tool was defective out of the box. the replacement scan tool came today and the data stored for the code showed that both the long term and short term fuel trims were between 0%and 1.5% which I gather is good.

                                  #438657
                                  Shaun_300Shaun_300
                                  Participant

                                    Yes it could be a slightly stretched timing chain. I wouldn’t be too concerned about that though. There are many notches on the reluctor wheel for the crank sensor, doesn’t take much to throw them out of whack. I’d get the relearn done and go from there. Not guaranteeing that’ll fix it for sure but I’d definitely try that first if you can’t feel any misfires at all. It has to be done with a scan tool, not sure if some of the aftermarket ones can do it or not or if you have to have it done at a dealer with the Tech2.

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