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  1. R

    5.3 Valve Lash

    These engines use hydraulic lifters so there really isn't any adjustment to be done on the valvetrain, all you can do is check the rocker arm bolts for tightness (do not over tighten!) or replace faulty lifters. Here's the functional description of the valvetrain from the service manual...
  2. R

    P04055 and P04096 Trouble Codes

    I think you might have an extra digit in your codes that doesn't belong there. I did a little Googling and found these codes which might be what you're looking for: P0455 is an evap leak. P0496 is for undesired intake manifold vacuum to the evap system. possibly a bad purge solenoid valve...
  3. R

    clicking sound when brakes applied

    It's normal. I don't think you can make the mechanism quieter without redesigning it, unless it's unusually loud for this type of vehicle. If it's really loud compared to other GMT800 trucks, you might swap the mechanism in from another truck. Then again, you only hear it when you press the...
  4. R

    clicking sound when brakes applied

    There's no relay in the stop lights circuit. What you're hearing is the shifter interlock solenoid that prevents you from shifting out of Park without pressing the brake pedal.
  5. R

    Engine light

    The light is supposed to come on when you turn the ignition on without starting the engine, and turn off when the engine is running. That is normal and lets you know that the light works. Are you saying that the engine light comes on even after you take the key out? The voltage readings sound...
  6. R

    HID Fogs causing strange problems

    Add an extra ground wire from the black wire at one of the washer fluid pumps to the chassis. The rear wiper will stop jumping when you turn on the fog lights. There's a TSB on it. I just took off my stock fog lights. I'd converted them to HID but they're just about the cheapest factory...
  7. R

    Locker VS Posi

    Posi is a trade name for a limited slip differential; the automakers all have had different names over the years for limited slip - Posi-traction, Sure-Grip, etc... A limited slip differential has the same internal gears as a normal open differential but also has friction clutches that can...
  8. R

    Gibson Headers..

    You won't be able to find a leak by just looking. Here's the method I've used to find exhaust manifold leaks (and cracks): Take a 3-4 ft length of vacuum hose or other flexible tubing (something like 1/8" to 1/4" dia hose), stick one end of it in your ear. With the engine running, move the...
  9. R

    Electrical issues

    The BCM door ajar inputs are: cargo door/liftgate switch is pin A1 (pink/black wire) on Connector C6 (the purple plug) right rear door is pin A2 (light green/black wire) on C6 left rear door is pin A3 (light blue/black wire) on C6 just for your information, the front door switches are via class...
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    slamming a range rover

    That's not the real problem. Ford's design systems and quality programs improved the reliability of Jaguar cars, believe it or not. They were much worse before. At least you don't hear about the brakes catching fire any more. I hate to say it, but the real problem is that they're British...
  11. R

    01 Cabin Air Filter Swap

    I would go with the carbon filter if it's not too much more $$$. I have an E-class Mercedes which has pollen filters and a separate carbon filter - you push a button and the carbon filter is switched in. The worst smells magically disappear.
  12. R

    Blower Motor Replacement

    The heater core is very difficult, but the blower motor is not. I replaced my blower resistor, which is right next to the motor and it was very easy. I pulled the motor out at the same time to check the condition of it. The hardest part was finding the correct socket - GM has used either a...

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