My Jeep Is Blowin Light Blue Smoke!? - JeepForum.com
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post #1 of 27 Old 11-04-2010, 09:12 PM Thread Starter
BeepBeepGoJeep
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My Jeep Is Blowin Light Blue Smoke!?

So...my jeep used to smoke a little at idle if it sat idling for long enough...you would rev it a few times see a lil bit of smoke then it would stop smoking for a little bit..Here recently its been doing it alot, like as soon as i stop driving and sit still for about 15 seconds it will start to blow out a little light blue smoke, it has a stinch to it, but almost seems like im smelling gas and oil, if i rev it a decent amount will come out then it might stop smoking for a few moments and it will start up again.

After switching to better injectors it almost seems to be worse then before...yet it runs way better then before this thing only has 131k, runs cool, strong, starts fast and has good oil pressure...somebody told me maybe it was somehow running rich and that it could be a bad fuel pressure regulator or something but idno, i already talked with my dad and next time he is free were gonna do a compression test, fuel pressure test and maybe a leakdown test, any help, suggestions, insight would be great, if it turns out to be something a little more serious like, pistons, rings, valve seals,valves or something then i guess im going to try and find a shortblock and slowly build that up, thanks sorry for the novel.


[]IIIII[]
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post #2 of 27 Old 11-04-2010, 09:51 PM
blue96jeep
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your burning oil, the oil is leaking into the cylinders somehow. either piston rings or the seals on the valve stems
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post #3 of 27 Old 11-04-2010, 10:02 PM
My1stxj
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possible head gasket
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post #4 of 27 Old 11-04-2010, 10:35 PM
cumminsjeep24
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i vote bad rings or valve seals. head gasket is another option but that would usually lead to a loss of power too.

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post #5 of 27 Old 11-04-2010, 10:36 PM
Mark-96-XJ
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Damn I would pay some big money to dump blue coal...

1999 XJ Classic, Auto, Power everything, 3 inch, GY Wrangler Radial 31's

1996 XJ 5 Speed, 100% Herculined, Rough country 4.5, BFG A/T 33's

2012 Honda Ruckus, Stock for now, 114 MPG, Daily Rider

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post #6 of 27 Old 11-04-2010, 10:47 PM Thread Starter
BeepBeepGoJeep
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ahhh poop this sucks.

[]IIIII[]
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post #7 of 27 Old 11-04-2010, 10:50 PM
99XJBeast
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Dont worry man, its a jeep thing.
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post #8 of 27 Old 11-04-2010, 10:51 PM
Empty_Pockets
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I would say valve seals.

1998 Cherokee 2 door 2.5L 5 speed
2000 Cherokee Sport 4.5in lift 33's (Sold)
1998 Cherokee Sport ORF bumper, Warn vr12, 6.5in long arm ended up netting 8-9in :( (SOLD)
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post #9 of 27 Old 11-04-2010, 10:55 PM
Tblack
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agreed, valve stem seals are my first guess. The compression test will tell the most truth. Make sure you get full pressure, allow about 6 turns of the engine on every cylinder. Should be like 120-150. and its gotta hold pressure as well. If its got bad compression, its probably the rings. Head gasket would make the exhaust smell super sweet (thats the antifreez), as well as burn blue.

good luck bud, hope it wall works out.
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post #10 of 27 Old 11-04-2010, 11:00 PM
My1stxj
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Quote:
Originally Posted by Tblack View Post
agreed, valve stem seals are my first guess. The compression test will tell the most truth. Make sure you get full pressure, allow about 6 turns of the engine on every cylinder. Should be like 120-150. and its gotta hold pressure as well. If its got bad compression, its probably the rings. Head gasket would make the exhaust smell super sweet (thats the antifreez), as well as burn blue.

good luck bud, hope it wall works out.

it all depends on how the head gasket blew (if it is that)
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post #11 of 27 Old 11-04-2010, 11:07 PM Thread Starter
BeepBeepGoJeep
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well alright thanks for the help, now its just a waiting game till me and my dad can get together and run a few tests on it, if its bad then i guess im gonna try and find a shortblock and slowly build it up, maybe .030 over, cam it and port it, and get a rebuild kit or something.

[]IIIII[]
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post #12 of 27 Old 11-05-2010, 05:30 AM
tjwalker
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Quote:
Originally Posted by BeepBeepGoJeep View Post
already talked with my dad and next time he is free were gonna do a compression test, fuel pressure test and maybe a leakdown test.
Testing is EXACTLY what you should do. Guesses and hunches won't tell you the story.

Test your way to a solution as good data = good decisions.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #13 of 27 Old 11-05-2010, 05:55 AM
cruiser54
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If it's valve seals like mine was, you can put them in without removing the head in an afternoon. I bought the Mopar Performance set for $18 from the local dealer.

This would be AFTER doing a wet/dry compression test.
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post #14 of 27 Old 11-06-2010, 09:35 PM
kudzu35
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This sounds like it may be my problem as well.

I recently changed the oil out on my 97 TJ and immediately got a nasty smelly light smoke from the engine. I pop the hood up and see smoke coming from the engine block where the cylinders would be and from the radiator cap.

I take it any dealer can run a compression test?
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post #15 of 27 Old 11-06-2010, 09:40 PM
toates89
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Quote:
Originally Posted by kudzu35 View Post
This sounds like it may be my problem as well.

I recently changed the oil out on my 97 TJ and immediately got a nasty smelly light smoke from the engine. I pop the hood up and see smoke coming from the engine block where the cylinders would be and from the radiator cap.

I take it any dealer can run a compression test?
your problem sounds totally different.

he is getting smoke out the tail pipe. which means either valves or rings.

you sound like you are overheating. possible head gasket. i advise for you no to drive it.

the op should do test and can continue to drive it with frequent oil level checks.
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