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      Updates and information regarding the W-body.com website.

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  2. General W-Body Discussion

    1. FAQs and Technical Information

      'How-To' articles and basic information for those who are new to the W-Body platform.

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    2. General

      General W-Body Discussion

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    3. Powertrain

      Engine and Transmission Maintenance, Repair, and Performance

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    4. PCM Tuning

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      This is the place to talk about brakes, suspension, lowering, wheels, tires, basically everything that affects your car's ride and handling.

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  3. Specialty Forums

    1. Turbo Grand Prix

      This forum is for enthusiasts of the rare 1989-90 Pontiac Grand Prix Turbo.

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    2. Cutlass Supreme Convertible

      A forum for information and discussion about the Oldsmobile Cutlass Supreme Convertible

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  • Posts

    • GnatGoSplat
      Wiring diagram explain please

      By GnatGoSplat · Posted

      Connect your meter positive lead to the 12V on L3 and negative lead to the relay socket L2.  With button on, do you see +12V? L2 should short to ground when the button is on.  On the diagram, the "Rear Defog Relay Control" is an electronic switch and that tapered 3-line symbol is ground.
    • 01 monte fan
      Wiring diagram explain please

      By 01 monte fan · Posted

      Ok, so I have tested voltage previously with relay removed. I have 12v on L3, but I ground out the negative terminal of my volt meter and have tested n3/L2 seperate. I have .5v on n3, 0v on L2 with button on. I will try a jumper for n3/L2 and see if any voltage is there and report back.  I was thinking that I should have 12v coming from the defrost button (L2) and not the bcm (n3)... 🤔
    • White93z34
      High Oil Pressure - 91 Grand Prix w/3.1L

      By White93z34 · Posted

      At the best of times these oil pressure sending units are of questionable accuracy. But these gauges aren't really padded out at all meaning that they are fairly active as oil pressure changes. Which seems relatively similar to how yours is acting. I'd be more suspect of junk new parts then any issues with your engine.
    • GnatGoSplat
      High Oil Pressure - 91 Grand Prix w/3.1L

      By GnatGoSplat · Posted

      Might be worth confirming oil pressure problems with a mechanical oil pressure gauge to make sure it's not from bad oil pressure sensors. I didn't find anything definite, but anything I could find mentions it's on the oil pump. Is there any signs of sludging?
    • GnatGoSplat
      Wiring diagram explain please

      By GnatGoSplat · Posted

      You should be seeing +12V when measuring across pins #85 and #86 on the relay socket (N3 and L2 in the diagram).  L2 should be grounded and N3 should be +12V with the ignition turned on.  If you don't see +12V on N3, try checking with positive lead of your voltmeter in N3 and negative lead on any grounded metal screw.  
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