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  1. Matt69olds

    What are these wires?

    The plug (cruise control lever) in the first picture plugs into the second socket (cruise control harness) in the second picture. Neither has anything to do with the wipers.
  2. Matt69olds

    Remove O2Sensor

    You need some serious heat. Got a torch?
  3. Matt69olds

    700R4 TCC Lockup Issues

    I used a 4th gear pressure switch and a time delay relay. Power to the solenoid and relay coil come from the normally open brake switch. When the transmission shifts to 4th gear, it supplies a ground to the relay coil, 10 seconds later the relay closes and engages the solenoid. Hit the brakes...
  4. Matt69olds

    Aftermarket A/C?

    Either roll the windows down, fix the factory A/C (assuming it’s do equipped) or do it right and install aftermarket A/C. Why would you hack up the truck??
  5. Matt69olds

    Questions on carb upgrade

    https://classicoldsmobile.com/forums/parts-sale-11/new-box-edelbrock-1904-795-cfm-quadrajet-186491/ The ONLY edelbrock carb I’d consider owning.
  6. Matt69olds

    Heavy miss / stumble at 1500+ RPM.

    Does it have HEI? If so, temporarily disconnect the vacuum advance. If it improves or is solved, carefully inspect the tiny wires for the pickup coil in the distributor. If the wires are broken or damaged, more than likely you found the issue. Replace the pickup coil. The problem is caused by...
  7. Matt69olds

    Needs MORE POWER!!! (Tim Taylor Style!!!)

    Beat me to it!!! Nitrous is by far the best bang for the buck.
  8. Matt69olds

    Help needed

    The second set of contacts is either for the cruise control, or as others mentioned the lockup torque converter.
  9. Matt69olds

    TH400 leak around speedo drive

    That’s an easy fix. You need the O ring that goes around the speedo housing, and the small seal that goes inside the housing that seals against the speedo gear. Go to your nearest transmission shop, chances are the builder has a box of those seals. If not, they are cheap to buy new. The...
  10. Matt69olds

    Questions on carb upgrade

    You can’t get more reliable than a properly rebuilt Q-Jet. And unless your willing to spend some time tuning, i seriously doubt you would improve on the performance and economy of a Q-Jet with a aftermarket carb.
  11. Matt69olds

    Knocking/ticking noise after oil pan gasket

    Remove the oil filter, cut it open. Use tin snips, don’t use a hacksaw. Once the filter is cut apart, remove the filter media. Spread it open, look for metallic debris. If the filter is clean, you can be reasonably sure your engine noise isn’t bearing related.
  12. Matt69olds

    bulkhead fitting sludge

    It’s some kind of sealer the factory used to keep water out of the connector. It’s definitely some gooey stuff.
  13. Matt69olds

    Quadrajet Secondary issue?

    Start by a detailed and careful inspection of the fuel system. Check the lines, especially the rubber hoses at the tank. Any cracks or pinholes means the pump is sucking air instead of fuel. More than likely the rubber components have deteriorated with today’s nasty fuels. If you decide to...
  14. Matt69olds

    TH400 Slipping When Warm - Chunks in Oil Pan

    Hopefully you have read Nicks th400 thread. Throw away the spring, replace the broken plastic piston with the older aluminum. Be sure to match up the piston with the intermediate band piston, there were design changes and potential compatibility issues.
  15. Matt69olds

    Nylon cam gear years

    I’m pretty sure all the classic GM engines are interference engines. I know for a fact the Pontiac and Oldsmobile engines will bend every exhaust valve if enough nylon flakes off. And if you just replace the chain without cleaning out the oil pump pickup, you can almost certainly plan on...
  16. Matt69olds

    Th400 important question.

    There are certain combinations of pump halfs (meaning the COVER and PUMP) but complete pumps can interchange. There are also certain combinations of pressure regulator valves that aren’t compatible, so either keep the pump parts together, or be VERY careful mixing and matching parts. The only...
  17. Matt69olds

    To Do List - Advice?

    The transmission should be on full time manifold vacuum. Don’t mess with the modulator until the vaccum lines are sorted out. I wouldn’t replace the distributor, repair or replace what’s worn. Unplug the oil sender, ground the wire. Turn on the ignition , the gauge should read zero. With it...
  18. Matt69olds

    High oil pressure after replacing pump

    I personally wouldn’t worry about the pressure until it gets entirely too low, or starts blowing off oil filters. There are lots of engines that will run forever with no pressure ( some seem to run without oil!) and some that normally run much higher pressure. I’d maybe consider dropping back...
  19. Matt69olds

    backfire under wide open throttle

    Put a test light on the tach terminal, ignition on. Does the light glow? If so, the distributor has power, and the primary side of the coil is good. Crank the engine, the light should flicker. If not, carefully inspect the wires to the pickup coil. If they are good I’d suspect the ignition...
  20. Matt69olds

    Alt putting out 17.4 volts. NOT GOOD right?

    If your reading 14.2 at the battery, but 17 at the alternator, then you are losing 3 volts in the charge wire. Either it’s severely undersized, or it’s in bad shape. Fix that and I bet the problem is solved.
  21. Matt69olds

    80' fuse box diagram,,,,,

    Before doing anything, push and pull the hazard switch a few times. Sometimes that cleans the contacts and gets troublesome lights working again. Check the brake light switch. See if you have power on the orange wire, then press the brake pedal, you should then have power on the white wire. If...
  22. Matt69olds

    Custom drive shaft.

    I just had a driveshaft built for my son’s 92 Yukon. Same thing, we just installed a 4 inch lift. Even though there was no mention of driveshaft modifications in the instructions, common sense made it obvious that about 25% of it’s normal engagement wasn’t going to cut it!! The shop that built...
  23. Matt69olds

    Do I restore my AC or?

    Is the system completely empty? If it still has a partial charge, you can rest assured the system doesn’t have a major component failure. Replace all the orings with 134a compatible seals. Replace the dryer. Replace anything else that’s questionable, especially the condenser. Drain the old A/C...
  24. Matt69olds

    Battery cable recommendations.

    Be careful using welding cable. While it will definitely tolerate the current, the insulation isn’t as forgiving with oil. Find a heavy equipment or heavy truck repair shop. They will have actual battery cable that’s suitable for automotive use, and in the gauge you need. The truck shop near...
  25. Matt69olds

    TH350 oil level, engine off

    Here is a hydraulic schematic from a service manual. As you can see, line pressure comes out of the pump, and tee into the pressure test port. It then continues to the manual valve. The test port is dead headed at the pipe plug. Adding potential issues, I remember someone here trying to use...

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