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  1. Matt69olds

    What is this gauge?

    The Buick dealership where I use to work had one of those thermometers in the glass display case, along with an add on Twilight Sentinel kit, keyless entry systems/alarms, and a bunch of other GM accessories. Some of them had been there for years, the boxes were sun faded so badly you could...
  2. Matt69olds

    HEI module dwell time.

    Oldsmobile use to specify .080 plug gap, and then later revised it. If I remember correctly, the issue was low speed misfired and ignition component wear.
  3. Matt69olds

    HEI module dwell time.

    When HEI first came out, the modules did have some reliability issues. It didn’t take long for Delco to figure it out and solve the issue. Unfortunately, the bad reputation still lingers. Even counting the time working in a dealership service department , I bet I have only replaced a dozen...
  4. Matt69olds

    Something killing battery

    I’d suspect the battery has a bad cell or is just junk. I don’t see how the choke heater could drain a battery in 45 minutes. Test the battery, make sure the charging system is good.
  5. Matt69olds

    Brake light keeps going out

    Eliminate all the other possibilties first, but if you have random taillight issues that can’t be solved, more than likely you have a defective turn signal switch. There are a bunch on contacts that have to make and break connections for the brake and turn signals to function, it’s kinda amazing...
  6. Matt69olds

    Help with a possible transmission issue

    A TH350 is the perfect beginner transmission. It’s easy to build, doesn’t require much in special tools, and what special tools are needed is easy to fabricate. Watch some YouTube videos before deciding if it’s something you want to attempt. Have a large clean work area, lots of bags to label...
  7. Matt69olds

    700r4 Governor cap

    Sometimes you have to get rude with those. The steel cover on an aluminum case creates lots of “environmental loctite”. Your probably going to destroy it getting it out. Once it’s out, clean up the case. More than likely there will be some pitting. Put a thin coat of sealer around the cover...
  8. Matt69olds

    1987 454 TBI down on power, runs good otherwise

    Put a temporary tach on it. I’d be curious what the fuel pressure is doing at highway speed. I know you said the pressure is ok at idle, but you can make 12 psi thru a straw, the engine won’t be happy under a load. Same thing with exhaust. While a TBI 454 isn’t a powerhouse, I would think it...
  9. Matt69olds

    1987 454 TBI down on power, runs good otherwise

    Start in low gear, accelerate pretty hard. Watch the tach, around 3500-4000rpm put the shifter in 2nd gear, the trans should immediately and firmly shift into 2nd gear. Continue to accelerate, at around the same engine speed put the shifter into drive. It should immediately and firmly shift into...
  10. Matt69olds

    86 HEI no spark

    Read this: https://www.gmcmi.com/wp-content/uploads/2014/05/HEI-Testing.pdf
  11. Matt69olds

    Radio Wiring

    Can you take a picture and share it here?
  12. Matt69olds

    4l80e rebuild gone wrong...

    Installing the sprag backwards is a mistake you only make ONCE. One of the first 400s I built I put the sprag on backwards. No 2nd gear, locked up in 3rd.
  13. Matt69olds

    Help: 85 305 Suddenly Stalling in Gear

    Guess this is useless info no that it’s fixed. But maybe someone else will find it useful. https://www.gmcmi.com/wp-content/uploads/2014/05/HEI-Testing.pdf
  14. Matt69olds

    Computer Control Quadrajet rebuild

    Q-Jets are junk!! I just rebuilt it and it still doesn’t run right!!! Get a Holley!! With that standard of mechanical aptitude, it’s no wonder Q-Jets hace the reputation they do. How does anyone who hopefully knows which end of a screwdriver to hold make a mistake like that??? I’m surprised...
  15. Matt69olds

    Radio Wiring

    Since these trucks never came with an amp or power antenna, GM didn’t include the wiring. More than likely, you will either need to add the wire to the existing connector or use a port in the fuse box that’s powered only in the run or accessory position. I’m assuming your radio plugs look...
  16. Matt69olds

    Factory AM/FM cassette radio

    I posted a “wanted” add for the needed plugs to test this. Or if someone is interested as is make me a smoking offer!!
  17. Matt69olds

    Radio plugs

    Anyone in readerland have an extra set of the factory Delco radio plugs? I have radio Id like to test before posting for sale. I believe there is a white, blue, and black plug.
  18. Matt69olds

    Anyone running an 8.1, what trans are you using?

    A used 4L80 a good valve body kit will easily handle far more than the 8.1 will produce.
  19. Matt69olds

    New Courtesy lamp switch is too long to let the door close.

    The grounding sleeve is a tight press fit into the switch housing. It self adjusts when you close the door. Slowly close the door, the sleeve will slide ito the housing and stop where needed.
  20. Matt69olds

    Exhaust Cut-Out Performance

    Check out some the exhaust episodes of engine masters. While not an apples to apples comparison, their test did explain some of the myths and theories of exhaust.
  21. Matt69olds

    4l80e rebuild gone wrong...

    Cracked reverse servo piston? Or defective seals on the accumulator piston inside the servo? I don’t have a hydraulic chart handy, if 2nd clutch oil was leaking into the band apply it might stroke the piston just enough for the band to drag, causing the bind up sensation. Might be worth...
  22. Matt69olds

    700R4 Skipping 2nd Gear

    And reverse I bet.
  23. Matt69olds

    Factory AM/FM cassette radio

    I looked today, I only have the white plug which I believe is front speakers. I have some friends looking thru their extra junk, hopefully someone has a complete set so I can test this.
  24. Matt69olds

    Factory AM/FM cassette radio

    I’ll know more if I have the plugs.
  25. Matt69olds

    Factory AM/FM cassette radio

    Dad found this radio in the shed. I took it out of our 81 GMC probably 30 years ago. I recall the radio worked, since I put a pioneer cassette deck in after removing this I doubt the deck works. Assuming I have the plugs, I plan to test it. Assuming it works, what’s it worth? Assuming it at...

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