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  1. EricC

    2008 yukon xl. All lights come on shifting hard at times and doors lock & unlock while driving

    Have you checked it for DTCs yet? Multiple DTCs, especially trans codes (P07XX) could be an indication of a faulty ignition switch. I wouldn't replace anything else until you get it diagnosed.
  2. EricC

    2015 Equinox low coolant in reservoir

    I used those GM cooling tabs for years with no ill effects. YMMV.
  3. EricC

    2015 Equinox low coolant in reservoir

    I assume they found damage from an outside source then. Contact a local radiator repair shop?
  4. EricC

    2002 Pontiac Gran Prix 3.1 Valvetrain Clatter

    They were known for piston slap as well, which AFAIK, they never did find a solution for.
  5. EricC

    2015 Equinox low coolant in reservoir

    Also pressure check the seal and pressure of the cap. Should be under warranty. Let GM handle it.
  6. EricC

    Looking for vacuum hose routing for 2000 Blazer

    If you can follow the vacuum lines under the battery box, search for a leak there. One of GM's most easily avoided design flaws IMO. ETA: it should be fairly straightforward to follow the vacuum line from the firewall back to source and find and repair the leak that way.
  7. EricC

    Misfiring 454, 1990 non-HEI

    I am not, but you haven't checked spark at the plugs yet so it's hard to say anything for sure. If you don't have a spark tester, get a screwdriver or an old spark plug and check it the old fashioned way. The way where you don't get bit is preferable. There are probably two sets of timing marks...
  8. EricC

    Misfiring 454, 1990 non-HEI

    Backfiring will be caused by improper timing or insufficient fuel pressure. Going to need better than a best guess.
  9. EricC

    Misfiring 454, 1990 non-HEI

  10. EricC

    Misfiring 454, 1990 non-HEI

    Have you verified lack of spark at the plugs, and have you checked fuel pressure? What did your old distributor gear look like? Did the new distributor come with a new ICM and pickup coil? What do the plugs look like? Plug wires? How did you set the timing after replacing the distributor?
  11. EricC

    Random air conditioning blows hot air

    I read the same thing. Looks like clutch coils were the cause. Most people just removed a shim and carried on.
  12. EricC

    Random air conditioning blows hot air

    Did you hook up your gauges and see what your static line pressure is? Most systems require ~50 psi before the clutch will energize.
  13. EricC

    pictures from work

  14. EricC

    Random air conditioning blows hot air

    So we're clear, you've called 4 dealerships to ask if this update has been performed on your GM vehicle and none of them would look it up and give you a straight answer? If that's the case, did you ask to speak to the service manager? The general manager?
  15. EricC

    2003 trailblazer trans not shifting corectly and reverse not working

    Glad to hear it, and well done.
  16. EricC

    wire colors

    My boss screamed when I ordered multiple spools of wire in every color and usable gauge available to stock my service truck and shop. He screamed, but he approved it. It prevents just exactly what you're talking about Dan. That and new or younger guys just grabbing anything to make a quick...
  17. EricC

    pictures from work

  18. EricC

    2003 trailblazer trans not shifting corectly and reverse not working

    No, reverse is not electronically controlled. It Is Purely Mechanical..
  19. EricC

    2003 trailblazer trans not shifting corectly and reverse not working

    The OP's Trailblazer has no reverse. Reverse doesn't use electrical inputs in a 4L60E, it's all mechanical.
  20. EricC

    2003 trailblazer trans not shifting corectly and reverse not working

    Make sure you flush the cooler and lines. I'll assume you're replacing the torque converter? Most specialty tools you can fabricate from common materials. You may have to pick up or borrow a couple of things.