Coolant around upper plenum

1998 BUICK PARK AVENUE
190,000 MILES • 3.8L • 6 CYL • 2WD • AUTOMATIC
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DCKELLEY
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i have coolant around upper plenum. I've posted about this car a lot. Car was given to me. i am not rich. I'm on Social Security and I'm not sure if fixing this anymore is a good idea. i was told by a cheap mechanic $500.00 to replace the upper plenum gasket. is there any other option? it's running and driving fine. Stressed. Don.
Mar 15, 2019 at 2:37 PM
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SCGRANTURISMO
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Hello,

If the coolant isn't getting in the spark plug holes, or messing with any sensors or such, I guess it would be okay to drive like that as long as you kept I real good eye on your coolant level and Kept it filled up. Eventually the gasket will degrade enough that it will require replacement. In the diagrams below I have included step by step directions on how to replace it yourself if you wanted to. I also have sent along parts price and labor estimate for you if you decide to shop around to have a shop replace it for you. Either way, please get back to us with what's going on.

Thanks,
Alex
2CarPros
Mar 15, 2019 at 3:05 PM
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DCKELLEY
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What do you think of trying bars? i bought the one with liquid copper. worth a try. i only drive to the store and doctor.
Mar 15, 2019 at 3:21 PM
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SCGRANTURISMO
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Hello again,

My personal opinion about that stuff is I don't like it. The reason I don't like it, though, is because I would rather fix things they way they were when before they failed. That's just me though. Bars might work, might not. If you were going to go that route, might I suggest a product that's a little more expensive, but has a lot better track record. It's called Blue Devil. You might want to check it out at your local part's house.

Thanks,
Alex
2CarPros
Mar 15, 2019 at 4:43 PM
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DCKELLEY
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Can i use blue devil after the bars? I've used the bars. maybe I'll wait for a bit. if it doesn't work, then blue devil. i understand completely about fixing instead of additives and i figured I'd hear that. but i can't afford to do it. it's that simple. i can't do the things i used to be able to do or maybe i'd try fixing myself.
Mar 15, 2019 at 5:45 PM
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DCKELLEY
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i checked my oil and i have creamy whitish slug in the cap.
Mar 15, 2019 at 6:15 PM
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SCGRANTURISMO
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Hello,

That usually is a sign of a blown head gasket, although some cars will allow coolant to get mixed with oil via the ports in an intake manifold. If you are not going to change the gasket I would recommend putting in Blue Devil. If you do, please follow the instructions to a "T". I've heard of and seen the stuff really work, and for a long time as well. Get back to us and let us know what's going on.

Thanks,
Alex
2CarPros
Mar 15, 2019 at 11:11 PM
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DCKELLEY
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There was no water on the dipstick or white slug. i read that short trips can cause some moisture and a bit of that slug on the cap. before the blue devil was recommended i used bars.. I'll drive it for a few days and see what happens. thanks, Don
Mar 16, 2019 at 12:56 AM
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DCKELLEY
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After using bars copper last night. (i followed the directions to the letter) and it seemed to help. i took it out on the highway today to get it nice and hot. i looked in the area it was leaking and it was dry when i got home. FYI, i had sludge in the oil cap but not the dipstick. no water today. i don't think it is the head but a slow pinhole in the upper gasket. this car sat for a year or two before i got it. i wonder if the gasket had shrunk. i dunno we'll see how long this lasts.
Mar 16, 2019 at 1:36 PM