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Rich Carbon Footprint V70-XC70 1998

posted by  On Hudson on  Fri Apr 11 16:08 CST 2014
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last visit: Sat Jul 19 19:19 CST 2014
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My plugs have - a nice coat of carbon, I smell gas in my exhaust and I doubted that I would pass a emissions test, so here I sit in the garage. I am doing the swap out of all the pcv parts and have the intake manifold off. what else should I be looking for ? The car ran fine, started fine, drove well.
What about carbon on the heads, should I try to rid this with sea foam? The engine light is not on.
I am putting in new distributor ,rotor, wires , air filter, plugs are relatively new,- 4000 miles








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    Rich Carbon Footprint V70-XC70 1998

    posted by  KlausC on  Fri Apr 11 19:44 CST 2014
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    last visit: Fri Oct 24 10:15 CST 2014
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    That is usually a byproduct of a minor vacuum leak. Look around for cracked elbows, loose lines, etc. In the 1998, don't forget to look at the vacuum lines at the fuel pressure regulator (on the subframe, between the engine and firewall on the passenger side).

    Clean the cylinder heads? Not needed at the present time, good lean combustion will clean them out once the engine is running well.
    --
    My back feels better when I sit in a Volvo seat








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      Rich Carbon Footprint V70-XC70 1998

      posted by  On Hudson on  Sat Apr 12 11:03 CST 2014
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      last visit: Sat Jul 19 19:19 CST 2014
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      Fuel pressure regulator a bit oily from some oil coming off the axle above the boot, so I guess I have a seal that's going on the transmission. Anyway pipes coming out of top of FPR are vacuum and not gas? Can you briefly explain how this works? How can I find the leaks without turning on the car,
      At 75,000 miles should I just be replacing the lines? I am about to do one oil cooler line -maybe both,while I am here and have some room to work.
      Thanks for reply








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        Rich Carbon Footprint V70-XC70 1998

        posted by  KlausC on  Sat Apr 12 12:21 CST 2014
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        last visit: Fri Oct 24 10:15 CST 2014
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        Vacuum lines die because of age, not miles. The two metal lines that go over the engine: one is fuel, the other is the vacuum and goes all the way to the front of the manifold.

        The FPR is a baffel device, the vacuum causes the baffel to go in or out. Fuel that is not used is returned to the tank. When the vacuum pressure is high, idle or little to no throttle, more fuel is allowed to return to the tank, reducing the pressure at the injectors. If the vacuum is low, the fuel pressure increases by as much as 4 psi.

        If a vacuum line has cracks, replace it. Same for any vacuum line elbows. And, no, there is no way to check the vacuum if the engine is not running. Normal vacuum at idle is negative 17-22psi.

        Hint: When putting the manifold back on, I found that starting the bottom bolt of the manifold support bracket and leaving it slightly loose works best. Once the top bolt is in place, tighten both of them. You won't be able to see the bottom bolt, but you now know where it is.
        --
        My back feels better when I sit in a Volvo seat








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          Finding anything and everything V70-XC70 1998

          posted by  On Hudson on  Sat Apr 12 13:02 CST 2014
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          last visit: Sat Jul 19 19:19 CST 2014
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          Finding bolts in dark places
          Often it is all about is having the right tools.
          I bought this scope camera for use in the building trades, but so useful for the mechanic.
          Factory Reconditioned Bosch PS90-1A-RT 12V Max Cordless Lithium-Ion Optical Scope from cpo bosch.
          And for $150 this is a lifesaver for exploring the tighter packed engines.
          Also when you are not looking at the screen it makes a really excellent pen light as
          You are not going to lose it as it has a huge long neck, invaluable....






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