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  1. O

    Will spark plugs clean up by driving.

    Exactly what is happening. Replaced the radiator cap. Heading home to change the thermostat. Vehicle is not getting up to temperature!
  2. O

    Will spark plugs clean up by driving.

    Comment deleted. Updated below.
  3. O

    Will spark plugs clean up by driving.

    I was able to get my friend to scan the vehicle with his OBD1 scanner. Vehicle isn’t getting up to temperature. Tried a new radiator cap. No help. Next up is new thermostat. Vehicle is never getting out of open loop due to not reaching temperature and short trips.
  4. O

    Will spark plugs clean up by driving.

    I added two cans of Seafoam and 16 ounces of Marvel Mystery Oil to a full tank of gas (37 gallons) to help with the cleanup. I also added a can of Bar’s Leaks Engine Seal to the oil to help control the oil leaking past the valve guides. I’ve run this far a couple of days. I pulled the number 5...
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    Bars Leak’s Oil Seal

    Has anyone used Bar’s Leaks Oil Seal? It sas that it stops leaks caused by bad valve guides. I replaced my plugs in November. The were fouled already. Partly because of bad valve guides and partly because the vehicle was running rich due to bad oxygen sensor and catalytic converter issues. I...
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    Thick oil wanted for 1991 4.3L GM V6

    I’ve been using Napa 10W/30. Last time, I used 3 quarts of Napa 16W/40 and 2 quarts of Napa Ow/20 full synthetic. Trying to use up the synthetic.
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    Thick oil wanted for 1991 4.3L GM V6

    If I can find it, I would definitely run that. I will look for it!
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    Thick oil wanted for 1991 4.3L GM V6

    Probably burning about a quart per month. The valve stem seals were replaced. That’s how the mechanic knew the valve guides were bad. I would guess the truck has about 145k miles. My school purchased it in 1995 with 56k miles. They put about 1200 miles per year on it. Oil changes were once per...
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    Thick oil wanted for 1991 4.3L GM V6

    Yeah, after 5 or 6 years of owning it, I had the stem seals replaced but my mechanic said the valve guides were worn. Not really worth replacing. Roughly a $1500-$2000 vehicle. Just want to slow down the oil burning.
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    Thick oil wanted for 1991 4.3L GM V6

    1991 Chevrolet K1500, 4.3 V6. I want to run a thicker oil due to oil burning caused by bad valve guides. Truck is a beater but runs decent; gets me from point A to point B. Brand doesn’t matter. I didn’t have any success in finding a cheap 5W/40. Wondering if I should run a 10W/40 or just run 3...
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    Will spark plugs clean up by driving.

    The plugs are Autolite Iridium. I will probably replace the #5 plug because it was fouled the worst.
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    Will spark plugs clean up by driving.

    1991 Chevrolet K1500, 4.3 V6. Plugs only have a few hundred miles on them but are Fowler. Two reasons, it’s t it burns oil due to bad valve guides. Second, vehicle was running rich due to a missing emissions component. I installed an oxygen sensor spacer this evening. Vehicle runs quieter, more...
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    Will a bad O2 sensor throw a code?

    I can guarantee that there are NO issues with my CATalytic converter.
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    Will a bad O2 sensor throw a code?

    Will a bad oxygen sensor always throw a code? Vehicle is a 91 Chevrolet K1500. 4.3 liter V6. It has only one sensor that is upstream of the catalytic converter.
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    Fuel issues, 1991 Chevrolet K1500

    Did that this morning and the truck started right up. So what does that mean? Fuel pressure regulator or leak down somewhere in the system?
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    Fuel issues, 1991 Chevrolet K1500

    Fuel pressure has to be checked by disconnecting the fuel line where it goes from tank to fuel filter. And, I suppose that you could tap into the opposite side of the fuel filter to check for leak down(?). I cycled my key three times this morning; key on, engine off. Truck started right up...
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    Fuel issues, 1991 Chevrolet K1500

    Fuel filter has been changed.
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    Fuel issues, 1991 Chevrolet K1500

    Fuel pressure has not been checked with new pump as far as I know.
  19. O

    Interesting deposit formation on spark plugs

    Could this have been too hot of a plug and melted the ceramic?
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