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  1. rockola1971

    What is this hose?

    I 2nd vac line to FPR.
  2. rockola1971

    Steering not returning to center?

    That gearbox is smoked. Have a look at your driver side front tire and rim and I suspect youll see the evidence of curb splat on them. Jack front end up off the ground just enough to clear the ground and have someone put light pressure on steering wheel to left and right just moving a degree...
  3. rockola1971

    Fuel pump pressure

    Both of my 2003 Tahoe LT's FFV, neither of them activate the fuel pump until the ignition is turned to the run position and then the pump shuts off within 3 secs or so. 80 psi isnt even remotely close to the spec for a FFV of our generation. The spec is 48-54psi KOEO.
  4. rockola1971

    Clunk Going Into Gear - UJoint?

    You can guarantee those needle bearings are bone dry.
  5. rockola1971

    Accidentally purchased a denali front differential to match gearing in my rear end.

    LT shows how easy it is to remove the extension the IFS diff. Technically for 4wd to happen you must have (1) the passenger and driver side axles locked together. (2) The front driveshaft engaged under power within the Tcase.
  6. rockola1971

    Accidentally purchased a denali front differential to match gearing in my rear end.

    The AWD front diff is just a 4WD diff with different passenger side housing. Technically the AWD unit is the Frankensteined unit.
  7. rockola1971

    Please help, engine runs very poorly!

    Theres quite a few grounds and hots that would cause just 2,4,6,8 problems. The wiring harness to your 2,4,6,8 coils get a ground at splice S157 to G102. Check your black wire at each plug of your coil, check resistance to ground. Should be low at each coil. Also check each pink wire for 12v...
  8. rockola1971

    Accidentally purchased a denali front differential to match gearing in my rear end.

    No. The shift solenoid locks the front driveshaft to the front diff.
  9. rockola1971

    Accidentally purchased a denali front differential to match gearing in my rear end.

    The only difference between the AWD and 4WD front Diff (In the same generation) is the axle housing(Passenger side), electric shift motor and the shift fork assembly. You can swap your 4WD components over to the AWD unit. Its fairly straightforward.
  10. rockola1971

    Accidentally purchased a denali front differential to match gearing in my rear end.

    AWD unit is a Borg Warner BW4481 (BW) Tcase. Not even close to the same as a NP246 (New Process/NVG-New Venture Gear). 2 totally different companies.
  11. rockola1971

    p1518

    OK you mean TAC(Throttle Actuator Control) Module. Possibility yours is hosed but they do rarely fail. Our chassis is getting old so the this could be the norm in the next 1-5 years. I personally have (2) 2003 Tahoe LT's and a 2005 Yukon Denali. Attached is the TAC Module schematic with...
  12. rockola1971

    p1518

    You dont have a TCM. Your PCM (Powertrain Control Module) includes a ECM (Engine Control Module) and TCM (Transmission Control Module) all in one unit called the PCM. Your PCM is located under the hood on drivers side.
  13. rockola1971

    ABS RF wheel activation

    Check that RF hub for excessive play. They get wobbly and trick the ABS into thinking that wheel is skidding and boom your ABS activates.
  14. rockola1971

    Please help, engine runs very poorly!

    OP says Fuel pressure good. Id like to know what fuel pressure is at idle and around 2k rpm. Didnt see that the spark plug wires were replaced? How about that braided ground wire running from engine to firewall? Inspect for corrosion at each end and go ahead and clean both ring terminals and...
  15. rockola1971

    p1518

    Usually when the PCM or any other module under the hood or chassis gets water intrusion into a plug you will get the green/blue crusties growing on the pins and its pretty obvious.
  16. rockola1971

    p1518

    Another failure point is the wiring harness that plugs into the TAC module. It plugs in at the bottom so the wiring harness just dangles off the plug under its own weight. The common breaking point there is one or more of the wires right where they enter the plug body of the harness to the TAC...
  17. rockola1971

    Completely Dead - Help - SOLVED

    You had a cell that was almost completely dead. The cells in a car battery are all in series so that means the max amount of current flow is the cell that has the LOWEST amp output. Ohms Law kicks our butt when it comes to power. Voltage is additive in a series circuit. Amperage is the same in...
  18. rockola1971

    p1518

    Get your step stool out and prepare to have a sore back. Your engine to firewall braided ground is broken/loose/corroded. Clean both ends at the block and at the firewall stud with a wire brush. Be sure to give the ring terminals on the end of the braided ground a good cleaning too. Dont be...
  19. rockola1971

    Fuel pump pressure

    Ethanol is corrosive and it will attack aluminum carbs. Ethanol also attracts water which will cause all water droplets in your tank to collect in one area with the ethanol and then when it gets sucked up by the fuel pump it will cause your engine to not just run rough but not at all because...
  20. rockola1971

    Fuel pump pressure

    55 PSI at idle sounds good. Whats the exhaust smell like? Fuel? Maybe you got leaky injector(s)?
  21. rockola1971

    shifting issues in 04 Tahoe

    Is it red or is red/orange to orange? Does it stink? Smell burnt? All this RPM's climbing while going from 1-2 sure sounds like clutches slipping like a SOB or your 2-4 band is toasted. If the band is roasted, you'll see its friction material layed out in the pan. It will be obvious.
  22. rockola1971

    Completely Dead - Help - SOLVED

    Yup 12v aint gonna cut it. The battery will drop to 10.5v while cranking the engine over.
  23. rockola1971

    Fuel pump pressure

    What is the pressure at idle? How about 2k Rpm's?
  24. rockola1971

    Dragging brakes 2004 Yukon - SOLVED

    The Tech II auto bleed is made for dummies. It starts off by telling you to press brake pedal while in neutral/park. Then it tells you which wheel to start off with and cycles the ABS pump for each wheel. No need to old school pump brake pedal and hold. The ABS pump is your inside the vehicle...
  25. rockola1971

    2004 Yukon XL 4x4 Transfer Case Issues

    Yup encoder motor commutator ring(mounted on encoder motor) is dirty/worn and the 4wd system is lost and doesnt know what position the Tcase actually is in. If you were truly in Tcase Neutral the vehicle wouldnt move when in gear (transmission). If you were truly in 4wd Low while going down a...

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