TheSilverBuick's 1967 Thunderbird

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  • TheSilverBuick
    ALMOST Spidey !
    • Nov 2007
    • 22145

    #166
    Re: TheSilverBuick's 1967 Thunderbird

    Well neither part's store had standard GM TBI rebuild kit in stock, it should be in on Tuesday :-\ So I'm going to park the T-bird out of the way and bring the Skylark around At least it runs, pretty well even, just 11.5 pig rich :P


    For a little back story on the tuning issue with the leaky injector. Prior to noticing a mechanical issue I could program the system to run ultra lean, basically the megasquirt tells the injectors to add very little fuel (base fuel was set really low) and it'd idle nice and sweet with a 14-15:1 AFR (livin off the leak), but when it came to driving the car, the amount of programmed fuel had to be turned waaaay up because it'd go dead lean and the VE table needed waaay to much change to be normal, and even then the base fuel amount was too low to properly add enough for loaded up driving. So switch it over to where I have it programmed now, it's waaay rich at idle, I have a normal base fuel setting and the VE table programmed to add essentially no fuel (why I thought one injector wasn't working) and it'll idle rich, but it runs hard (and rich) loaded up in gear. So I can move it around but I won't be driving it too far like this.
    Escaped on a technicality.

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    • TheSilverBuick
      ALMOST Spidey !
      • Nov 2007
      • 22145

      #167
      Re: TheSilverBuick's 1967 Thunderbird

      Well I think I cooked an injector :'( The o-rings were good, the whole inside of the TBI looked great. As soon as the electric fuel pump kicked on (for the five/ten second prime) one injector just pours full bore while the other remains pretty much dry :-\

      I found a set of injectors on E-bay for $70 a pop, so I bought two figuring if I cooked one with the settings, the other could be on the fence.... Should take me less than five minutes to swap injectors once they show up.

      Got to be careful with low impedance injectors :-\ Live and learn.
      Escaped on a technicality.

      Comment

      • SuperBuickGuy
        No Life Outside BangShift.com
        • Jan 2008
        • 32262

        #168
        Re: TheSilverBuick's 1967 Thunderbird

        Sunday I'll look for the injectors I pulled off my 93 Chev pickup.... problem is, I have no idea where I put those things (it was 2 moves ago).... if I find them, they're all yours.
        Doing it all wrong since 1966

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        • TheSilverBuick
          ALMOST Spidey !
          • Nov 2007
          • 22145

          #169
          Re: TheSilverBuick's 1967 Thunderbird

          Originally posted by Buickguy
          Sunday I'll look for the injectors I pulled off my 93 Chev pickup.... problem is, I have no idea where I put those things (it was 2 moves ago).... if I find them, they're all yours.
          Don't worry too much about it. I learned that OE injectors are of a different design, plus OE injectors have a lower fuel flow rate. Infact I learned the current injectors I have are obsolete, and the kit to convert it to the new injector styles is $100, plus the cost of two new injectors.
          Escaped on a technicality.

          Comment

          • dieselgeek
            Legendary BangShifter
            • Oct 2007
            • 9809

            #170
            Re: TheSilverBuick's 1967 Thunderbird

            are you sure the injector was killed with software settings? I've never seen this happen. I've seen improper use of PWM kill an injector driver in a megasquirt, so make sure it's not your MS that's toasted. (it's a cheap and easy fix if you did kill the injector driver circuit).

            www.realtuners.com - catch the RealTuners Radio Podcast on Youtube, Facebook, iTunes, and anywhere else podcasts are distributed!

            Comment

            • TheSilverBuick
              ALMOST Spidey !
              • Nov 2007
              • 22145

              #171
              Re: TheSilverBuick's 1967 Thunderbird

              Originally posted by dieselgeek
              are you sure the injector was killed with software settings? I've never seen this happen. I've seen improper use of PWM kill an injector driver in a megasquirt, so make sure it's not your MS that's toasted. (it's a cheap and easy fix if you did kill the injector driver circuit).
              Hmm, are their one or two drivers? Because one injector acts differently than the other, plus the "bad" one drips after the key is turned off.
              Escaped on a technicality.

              Comment

              • dieselgeek
                Legendary BangShifter
                • Oct 2007
                • 9809

                #172
                Re: TheSilverBuick's 1967 Thunderbird

                Originally posted by TheSilverBuick
                Originally posted by dieselgeek
                are you sure the injector was killed with software settings? I've never seen this happen. I've seen improper use of PWM kill an injector driver in a megasquirt, so make sure it's not your MS that's toasted. (it's a cheap and easy fix if you did kill the injector driver circuit).
                Hmm, are their one or two drivers? Because one injector acts differently than the other, plus the "bad" one drips after the key is turned off.

                Yep, there are two separate channels/drivers.
                www.realtuners.com - catch the RealTuners Radio Podcast on Youtube, Facebook, iTunes, and anywhere else podcasts are distributed!

                Comment

                • TheSilverBuick
                  ALMOST Spidey !
                  • Nov 2007
                  • 22145

                  #173
                  Re: TheSilverBuick's 1967 Thunderbird

                  Originally posted by dieselgeek
                  Originally posted by TheSilverBuick
                  Originally posted by dieselgeek
                  are you sure the injector was killed with software settings? I've never seen this happen. I've seen improper use of PWM kill an injector driver in a megasquirt, so make sure it's not your MS that's toasted. (it's a cheap and easy fix if you did kill the injector driver circuit).
                  Hmm, are their one or two drivers? Because one injector acts differently than the other, plus the "bad" one drips after the key is turned off.

                  Yep, there are two separate channels/drivers.
                  I'll swap the injector wires and see if the injectors reverse roles.
                  Escaped on a technicality.

                  Comment

                  • TheSilverBuick
                    ALMOST Spidey !
                    • Nov 2007
                    • 22145

                    #174
                    Re: TheSilverBuick's 1967 Thunderbird

                    As I thought, a bad/plugged injector. Got the injectors in yesterday. I thought they were $70 each off ebay, turned out they were $70 a set! So now I have a spare set too. I popped two injectors in the TBI in about five minutes, the car fired right up but died pretty quickly. So I bumped the fuel requirements (because I had leaned it out to compensate for the bad injector), and BAM idling away like a champ. A few uppings of the fuel VE table and it was revving pretty good. So I drove it across town to datalog on get gas ;D Of course when I got to the gas station I remembered my brake lights are out :o I think it's a loose brake switch wire, but I'll start chasing that now. But it's up and runn'in!
                    Escaped on a technicality.

                    Comment

                    • milner351
                      No Life Outside BangShift.com
                      • Nov 2007
                      • 16033

                      #175
                      Re: TheSilverBuick's 1967 Thunderbird

                      SWEEEEEEEET!
                      There's always something new to learn.

                      Comment

                      • TheSilverBuick
                        ALMOST Spidey !
                        • Nov 2007
                        • 22145

                        #176
                        Re: TheSilverBuick's 1967 Thunderbird

                        Got the brake lights working, just a simple wire I suspected. I'll be driving this downtown tomorrow night 8)
                        Escaped on a technicality.

                        Comment

                        • SuperBuickGuy
                          No Life Outside BangShift.com
                          • Jan 2008
                          • 32262

                          #177
                          Re: TheSilverBuick's 1967 Thunderbird

                          your fixes are too easy ;D a blown head gasket, a bad injector.... i'm jealous :-[
                          Doing it all wrong since 1966

                          Comment

                          • DanStokes
                            Ancient LSR Guy
                            • Oct 2007
                            • 28692

                            #178
                            Re: TheSilverBuick's 1967 Thunderbird

                            VROOOM, VROOOM!!!

                            Dan

                            Comment

                            • Scott Liggett
                              No Life Outside BangShift.com
                              • Oct 2007
                              • 21561

                              #179
                              Re: TheSilverBuick's 1967 Thunderbird

                              Can it do a burnout now?
                              BS'er formally known as Rebeldryver

                              Resident Instigator

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                              • milner351
                                No Life Outside BangShift.com
                                • Nov 2007
                                • 16033

                                #180
                                Re: TheSilverBuick's 1967 Thunderbird

                                Originally posted by Rebeldryver
                                Can it do a burnout now?
                                hmmm a torque monster in a heavy car with tiny tires....

                                Here's a sure fire recipe for a righteous burn out:

                                Start engine, allow to warm up.
                                Confirm tire pressures and perform a general safety inspection.
                                On a piece of road in good condition with no traffic, or bystanders,
                                Perform WOT acceleration in Reverse.
                                With no reverence of any kind for the tires transmission, or driveshaft...
                                while still travelling in a reverse direction,
                                remove foot from throttle, place gear selector in D, replace foot on throttle and apply WOT.
                                Enjoy smokey burnout with wreckless abandon - while carefully watching tachometer to not overspeed engine.

                                Hope transmission does not end up leaving pieces scattered about said road in good condition. ;D
                                There's always something new to learn.

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