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  • 99 Firebird V6 Problems

    Hi,
    I bought a 99 Firebird with the 3.8 V6 2 weeks ago. The car is near perfect with only 47,000 miles. A girl owned it and drove it 4,000 miles in the last 4 year, only putting on 800 last year after having new plugs,wires,filters changed, then it sat from Sept. 07 until I bought it. When I picked it up they had just started it for the first time since last sept. and it was almost out of fuel, was chugging, dying at stop signs, etc. I figured it was just bad gas from sitting, so I payed for it and drove right to a gas station and filled her up with premium. Well, it runs great on the highway, has lots of power, but after 500 miles of driving and adding seafoam, injection cleaner, etc, it hasn't gotten much better. I them assumed an injector was stuck open, went to the local junkyard and bought a full set of injectors. It idled great right away, but as it warmed up it went right back to the same thing. It is obvious that it is getting way to much fuel at idle, it gets loaded up after a few minutes of idling, where you have to revit good to get it cleared out. It runs perfect down the highway, is faster than I ever thought a 6 cylinder could be without a hint of a miss. It is just getting way too much fuel at idling and low speeds. Any ideas ? The local advance auto says the codes say rich condition on right and left bank and misfire. I haven't had it to a shop with a real scanner yet, just wondering if anyone has had a similar problem before I spend more money. Thanks

    I started the car up today, fired right up and ran perfect, the longer it sits and idles, it starts to misfire, getting worse the longer it idles. It runs perfect out on the road, never misses, tons of power. One thing I noticed is the fans NEVER come on, a buddy suggested maybe it is running in a cold start up mode all the time. I looked for a temp sensor on the radiator and can't see one. Is the fans never running a hint of what could be wrong ? Also, where is the throttle cable ? I don't see one anywhere, it must be a "drive by wire" ? with a sensor down on the gas pedal ??

    Any help would be appreciated, all the usual things are fine such as plugs,wires,fuel filter,etc., remember, it runs great out on the highway, very fast and never misses, it's just acting like an older car that has the choke on partway.

  • #2
    Re: 99 Firebird V6 Problems

    The temp sensor from what I recall is just below the throttle body. In the upper or lower intake manifold, eh I can't remember specifically.

    Your car is acting how my car is when I had it running for 5 minutes, but I put bigger injectors, a turbo and a few other things that I haven't entirely tuned yet.

    Yeah your car is drive by wire, fly by wire, whatever.. I've heard a few different names.

    Maybe you should check your fuel pressure regulator.

    TEAM C6V6

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    • #3
      Re: 99 Firebird V6 Problems

      any SES codes?

      Comment


      • #4
        Re: 99 Firebird V6 Problems

        Hi, is it possible if the fuel pressure is too high or too low that it could cause this condition ? I don't know exactly how the injectors function, i.e. could too low pressure cause them not to close fully, or too high pressure pushing fuel through them ??? Thanks

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        • #5
          Re: 99 Firebird V6 Problems

          Originally posted by Smoke Panther View Post
          any SES codes?
          .....

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          • #6
            Re: 99 Firebird V6 Problems

            the low fans dont kick on until 220 I think. you can get a manual fan switch for that.

            was it a random misfire code?

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            • #7
              Re: 99 Firebird V6 Problems

              The parts store said it was a random misfire code, and rich conditions on right and left bank. I tried my dads scanner and it comes back with 0306, which is #6 misfire......I can't stress how perfect this car runs under load and going down the highway.....it's just when it idles it starts slowly loading up......what would cause it to be getting so much fuel ? btw, the fans are working.....they are just so quiet it's hard to tell....I have an 02 firebird and when they come on you could hear them a block away.

              Comment


              • #8
                Re: 99 Firebird V6 Problems

                an overload of fuel wouldn't manifest itself as a misfire, nor in the problems you've observed. Swap the coilpack for the #6 cylinder with another one of yours, and see if the SES code moves to a different cylinder

                Comment


                • #9
                  Re: 99 Firebird V6 Problems

                  Originally posted by Smoke Panther View Post
                  an overload of fuel wouldn't manifest itself as a misfire, nor in the problems you've observed. Swap the coilpack for the #6 cylinder with another one of yours, and see if the SES code moves to a different cylinder
                  yes, it definitely would

                  although i dont think the problem is fuel related, since it is doing the same thing after the replacement injectors

                  try taking number 6 plug out and clean it, th probably was a leaky injector, which on startup fouled the plug out really bad

                  coil's dont usually go bad just from sitting

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                  • #10
                    Re: 99 Firebird V6 Problems

                    Originally posted by cam98aro View Post
                    yes, it definitely would
                    Have you ever, in person, seen a car that's running incredibly rich?

                    coil's dont usually go bad just from sitting
                    the OP did not specify what conditions the car was sitting since last september in. Moisture kills coil packs quite often, as the cowl design is faulty when keeping water from dripping down onto it

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                    • #11
                      Re: 99 Firebird V6 Problems

                      ^^^ Hell yeah. Mine did the same thing...even right on #6 lol. It was the coil pack. It ran great under load! First time I tried to drive it after a winter of being stored in our shop. How do you think I felt....Like...What the hell? It was fine just months ago!

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                      • #12
                        Re: 99 Firebird V6 Problems

                        Swapping the coil packs around is a good idea to see if the misfire moves. Also you might want to check the fuel pressure regulator. I have seen the diaphram in them leak before, causing fuel to get sucked into the inkake through the vacuum line. While it's running, unplug the vacuim line from the fuel pressure regulator and see if there's fuel coming out of it. Also check your plugs. If it's been running rich enough, the plugs can be fouled out pretty quick. A scan tool that would allow you to monitor O2 sensor readings might help.
                        -<i>Travis</i><br /><b>99 Trans Am, Pewter, A4</b> Forged, stalled, and cammed<br /><b>85 Buick Regal WH1 T-Type</b> It\'d be cool if it ran...<br /><b>94 Camaro 3.4, Teal, M5</b> The daily beater

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                        • #13
                          Re: 99 Firebird V6 Problems

                          Originally posted by Smoke Panther View Post
                          Have you ever, in person, seen a car that's running incredibly rich?
                          yes, infact i have

                          Comment


                          • #14
                            Re: 99 Firebird V6 Problems

                            Originally posted by cam98aro View Post
                            yes, infact i have
                            and was a misfire the only indication, as stated by the OP and his car problems, of this?

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                            • #15
                              Re: 99 Firebird V6 Problems

                              I just pulled the vacuum line off the regulator and fuel is coming out of the vacuum port of the regulator.......Awesome, looks like I found the problem......but..the regulator, at least the housing looks to be part of the fuel rail, the rail I got from the junkyard off a 2000 Bonneville is alot different, but it looks like the regulator is held in with a snap ring ?? The one on my car is facing toward the back of the car, so it looks like the rail has to come out again ?

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