I was parked on a small hill today kind of like on a angle with front end nose downhill the passenger side more then down hill then driver. It set for about 3 hours then went to crank it and blue smoke puff came out of exhaust it was prob 85-90 degrees outside and I have seen blue smoke befor and there was no blue smoke trail following it sorry it's a 98 cherokee 4.0 with 123,000 miles doesn't let oil or have to add any between changes I know of. Is that normal or something else I can check out or what?

 

IIRCC;
BLUE smoke is fuel related possible Valve seals

Black = oil seals

White or Light grey usually means = Head gasket.

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Im sure there are many here more qualified to help. Just recalling what my Dad taught me to watch for as a kid growing up.



Side note : Happy Fathers Day

 

Thanks happy Father's Day too and I have been trying to get it too but haven't seen anymore idk if it was just the hill or what

 

Blue smoke is burning oil.
Black smoke is unburned fuel.
White "smoke" is steam indicating a blown head gasket or cracked head.

Blue smoke on start up is usually a sign of warn valve guide seals.

 

But could it have just been from being parked on hill?

 

Yeah, the oil pooled around one or more of the valve guides because of the angle the vehicle was parked at.

 

Is that normal

 

It is for a vehicle with worn out valve seals and/or worn valve guides.

 

You obviously drove through a rainbow. I'm guessing most of the rainbow got sucked into your engine. You can expect it to fart out the rest of the colors for about another week, if your lucky you might even find some lucky charms shooting out of the tailpipe. I'm sorry I had to.

 

That was a magically delicious description ....

 

If it keeps spewing blue smoke I'd begin to worry. But if it happened just that once then I wouldn't worry too much.

 

It's still blue?! You must have drove through a massive double rainbow. You got about 2 months worth of colors coming your way pal, I would also suggest keeping a fully loaded 38 under your seat because your gonna be attracting some leprechauns pretty soon, and you don't want to be unarmed when you run into a horde of those little guys. But for real doe I would google what blue smoke means and get a master mechanics advice because that sounds serious.

 

This has been the only time it has done this and I can't get it to do so again maybe it was just a one time thing. I just worry and wanted to be cautious. And this being such a clean jeep and low mileage for the year at least around here it is I want to keep it up.