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  • buick wont start?

    my 1992 buick park avenue wont start?

    ive checked all the fuses and theyre all good. its getting fuel and has a new battery and turns over fine but its getting no spark to the coils.

    whats wrong?

  • #2

    Re: buick wont start?

    Re: buick wont start?

    how do you know it's getting fuel?

    it's pretty common on those 3800s to lose the cam position sensor, or crank position sensor. What you want to find out is if the injectors are firing or not (noid light tester is cheap and works), if the inejctors are firing then you know the problem is with the ignition coilpack or it's power/grounds. If the inejctors aren't trying to fire, that means the ECU isn't seeing engine RPMs and never trying to fire the coils or injectors.

    On that setup, the crank sensor signal goes to the ignition box first. Got a haynes manual or service manual? follow the diagnostic procedures...
    Proudly using www.DIYAutotune.com custom EFI components!

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    • #3

      Re: buick wont start?

      Re: buick wont start?

      i can hear the fuel pump turn on when i turn the key forward so i was assuming it was getting fuel :

      i have one of these. could you test the injectors with this?


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      • #4

        Re: buick wont start?

        Re: buick wont start?

        if it turns over, it won't be the safety switch.

        The fuel pump just pressurizes the rails. Doesn't mean the injectors are opening. that test light will only check power to the injectors, not that they're being triggered/opened.

        You can make a noid light with a simple LED, but it's easier to go get one at a parts store. Have you tried holding the throttle wide open while cranking the starter? might just be flooded...
        Proudly using www.DIYAutotune.com custom EFI components!

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        • #5

          Re: buick wont start?

          Re: buick wont start?

          if it turns over, it won't be the safety switch.

          The fuel pump just pressurizes the rails. Doesn't mean the injectors are opening. that test light will only check power to the injectors, not that they're being triggered/opened.

          You can make a noid light with a simple LED, but it's easier to go get one at a parts store. Have you tried holding the throttle wide open while cranking the starter? might just be flooded...
          ive tried starting it at WOT. still didnt start.

          is there any way i could take out the injectors to see if theyre opening? (i dont know much about FI)

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          • #6

            Re: buick wont start?

            Re: buick wont start?

            if it turns over, it won't be the safety switch.

            The fuel pump just pressurizes the rails. Doesn't mean the injectors are opening. that test light will only check power to the injectors, not that they're being triggered/opened.

            You can make a noid light with a simple LED, but it's easier to go get one at a parts store. Have you tried holding the throttle wide open while cranking the starter? might just be flooded...
            ive tried starting it at WOT. still didnt start.

            is there any way i could take out the injectors to see if theyre opening? (i dont know much about FI)

            not really. not without making a huge fuel mess anyways, and catching yourself on fire.

            you can see if a spark plug is getting wet or not.
            Proudly using www.DIYAutotune.com custom EFI components!

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            • #7

              Re: buick wont start?

              Re: buick wont start?

              i'll check the spark plugs. :D

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              • #8

                Re: buick wont start?

                Re: buick wont start?

                what if you sprayed some brake cleaner down the throttle body while someone tried to start it.
                if it runs it might tell you it's not getting gas?
                probably a bad idea, i know, but i've done it before.
                also boost will make the cam act smaller

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                • #9

                  Re: buick wont start?

                  Re: buick wont start?

                  checked the plugs. they were dry.

                  now what? new injectors?

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                  • #10

                    Re: buick wont start?

                    Re: buick wont start?

                    get a manual and follow the diag procedure.

                    the injectors may be fine. if the ecm isnt seeing a cam or crank signal then it wont trigger the injectors.

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                    • #11

                      Re: buick wont start?

                      Re: buick wont start?

                      he said he can hear the fuel pump.

                      if he has no spark how are you going to sugget a fuel issue really come on.

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                      • #12

                        Re: buick wont start?

                        Re: buick wont start?

                        sure

                        you say hold it but i use a light that goes in between the boot and plug so i dont get shocked. brains before brawn

                        get a fuel pressure guage and check your fuel pressure before you go beating on your gas tank like a caveman. this will tell you if you have pressure at the rail.

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                        • #13

                          Re: buick wont start?

                          Re: buick wont start?

                          no worries with being a hack but i guess im more of the professional (your words not mine). you might be able to borrow a fuel pressure guage from your local auto parts store.

                          there are things and times to be a hack and i just dont do that when trying to diagnose a car.

                          ive been hit by an msd it doesnt feel good when your arm is numb for 3 days.

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                          • #14

                            Re: buick wont start?

                            Re: buick wont start?

                            ok so why not check fuel pressure at the rail before you go banging on the gas tank....will that magically give you fuel pressure. im trying to understand your logic.

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                            • #15

                              Re: buick wont start?

                              Re: buick wont start?

                              ok that was much better than just saying wack the gas tank.

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                              • #16

                                Re: buick wont start?

                                Re: buick wont start?

                                hahahahahahahahahahaha



                                PLEASE DONT DO THIS

                                Comment


                                • #17

                                  Re: buick wont start?

                                  Re: buick wont start?


                                  On a serious note, I'd be curious to disassemble a bad pump and see what breaks. I've heard that they are cooled by the gas flowing through them and will overheat / fail if the pump is run dry or if you frequently run it low on gas.
                                  that's the case with older cars....newer ones (late 90s?) have a reservoir around the pump that keeps it submerged all the time.

                                  An air conditioning (R12) pressure gage can be used to check fuel pressure on some GMs

                                  For spark test, the older GM manuals suggest cutting the ground electrode off a new spark plug, and using it to test for spark. I connect the shell of the plug to ground with a big clip lead, saves from getting zapped. If it will jump the extra long gap from the center electrode to the threads, then it has enough juice to fire the plugs.

                                  I would not buy any new parts until you verify either spark or fuel pressure working/not working properly.
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                                  • #18

                                    Re: buick wont start?

                                    Re: buick wont start?

                                    OBDII is so cash. 8) Way easier than being smart like dieselgeek.

                                    Assuming no go on the noid light, how would one go about determining if it's a sensor or an ECM on a 92 like that?

                                    It'd be good info because I'm looking to pick up a 3rd gen firebird eventually and a lot of that 80's junk mystifies me.
                                    Cheap, slow, half-assed: Pick three

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                                    • #19

                                      Re: buick wont start?

                                      Re: buick wont start?

                                      He said no spark. I am presuming he already tried actually checking for it. It's not hard, there are many ways to do it.


                                      I'm gonna bet Cam/crank sensor. Beagle seems to think fuel pump but those aren't usually an on/off problem.


                                      Monte, check for spark next. Don't spray chemicals or starter fluid down the intake, that's a dumbass idea and isn't going to tell you anything more than checking for spark, and it is a huge fire hazard.

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                                      • #20

                                        Re: buick wont start?

                                        Re: buick wont start?

                                        ok that was much better than just saying wack the gas tank.
                                        come on now whaking on the gas tank has gotten me home before

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