blowing smoke?
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Hey there Steve. Did we loose a Renix guy?
I suppose you know, white steam dissipates, (humidity matters!), and oil smoke that might be bluish hangs allot better. Oil seeping in down past the valve seals/guides might puff more starting it, after it's been parked hot. (and sat a bit). Valve seals and rings might also make a scene after decelerating down a good hill, "backlashing", using the engine for a brake.
But..it's probably not the oil pan gasket. Maybe the oil filter adapter O rings are letting oil run/blow back then down to the exhaust crossover where it is burning off the hot pipe. Just a thought, mine did that. (I put in a "shield" there with wire till I could fix it), Waz afraid it might catch fire! (or attract attention I didn't want)
Is the front CCV tube routed to the air cleaner, and is the air cleaner OK? (or oily) Is that tube free and un-restricted?
I suppose you know, white steam dissipates, (humidity matters!), and oil smoke that might be bluish hangs allot better. Oil seeping in down past the valve seals/guides might puff more starting it, after it's been parked hot. (and sat a bit). Valve seals and rings might also make a scene after decelerating down a good hill, "backlashing", using the engine for a brake. But..it's probably not the oil pan gasket. Maybe the oil filter adapter O rings are letting oil run/blow back then down to the exhaust crossover where it is burning off the hot pipe. Just a thought, mine did that. (I put in a "shield" there with wire till I could fix it), Waz afraid it might catch fire! (or attract attention I didn't want)
Is the front CCV tube routed to the air cleaner, and is the air cleaner OK? (or oily) Is that tube free and un-restricted?
Last edited by DFlintstone; Sep 20, 2012 at 02:07 AM.
Thread Starter
CF Veteran
Joined: Nov 2011
Posts: 1,290
Likes: 0
From: phoenix az
Year: 1989
Model: Cherokee
Engine: 4.0l 6 cylinder
Hey there Steve. Did we loose a Renix guy?
I suppose you know, white steam dissipates, (humidity matters!), and oil smoke that might be bluish hangs allot better. Oil seeping in down past the valve seals/guides might puff more starting it, after it's been parked hot. (and sat a bit). Valve seals and rings might also make a scene after decelerating down a good hill, "backlashing", using the engine for a brake.
But..it's probably not the oil pan gasket. Maybe the oil filter adapter O rings are letting oil run/blow back then down to the exhaust crossover where it is burning off the hot pipe. Just a thought, mine did that. (I put in a "shield" there with wire till I could fix it), Waz afraid it might catch fire! (or attract attention I didn't want)
Is the front CCV tube routed to the air cleaner, and is the air cleaner OK? (or oily) Is that tube free and un-restricted?
I suppose you know, white steam dissipates, (humidity matters!), and oil smoke that might be bluish hangs allot better. Oil seeping in down past the valve seals/guides might puff more starting it, after it's been parked hot. (and sat a bit). Valve seals and rings might also make a scene after decelerating down a good hill, "backlashing", using the engine for a brake. But..it's probably not the oil pan gasket. Maybe the oil filter adapter O rings are letting oil run/blow back then down to the exhaust crossover where it is burning off the hot pipe. Just a thought, mine did that. (I put in a "shield" there with wire till I could fix it), Waz afraid it might catch fire! (or attract attention I didn't want)
Is the front CCV tube routed to the air cleaner, and is the air cleaner OK? (or oily) Is that tube free and un-restricted?
the smoke is not bluish and it still smokes even wen warmed up hot.
im going to try replacing my oil pan gasket this weekend on sunday and maybe the head gasket also what should i be expecting
CF Veteran
Joined: Aug 2011
Posts: 10,489
Likes: 24
From: Nor-Cal Coast
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
I'd hit ti with a can of degreaser, then a good cleaning at the car wash 1/2 hr later. I stay pretty clear of the dizzy and the manifolds, and there are obvious places you don't want the nozzle drilling in being too close. (the Map, wire connectors ect). Since you are not hitting the manifold's or TB, you won't ruin the TPS.
Then watch it really close right away, maybe have some nice rags. Finding the leak is supper tough once the oil has blown all over. Then watch it really close right away. With it clean, you could/should find the exact spot where the oil is leaking from. Sun reflected off a mirror is so much better than the best flashlight, I keep little pieces of mirror all over. Even works underneath at sundown! Maybe find the leak for sure, then go from there.
Pulling the pan is no fun, hope it's hot that. How many miles?
Then watch it really close right away, maybe have some nice rags. Finding the leak is supper tough once the oil has blown all over. Then watch it really close right away. With it clean, you could/should find the exact spot where the oil is leaking from. Sun reflected off a mirror is so much better than the best flashlight, I keep little pieces of mirror all over. Even works underneath at sundown! Maybe find the leak for sure, then go from there.
Pulling the pan is no fun, hope it's hot that. How many miles?
Senior Member
Joined: Dec 2011
Posts: 851
Likes: 0
From: Riverside county
Year: 89' soon to be
Model: Cherokee
Engine: 4.0 HO 167k miles
I would like to know when and from where? Went back and double checked the post. From engine, tail pipe, mid Cherokee? Just started, flooring it, idle, downhill?? This will really narrow down. You say blow smoke, I think tail pipe while warmed up... But you keep mentioning the oil pan. Oil pan would not blow from pipe...details please! ;-)
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
I would like to know when and from where? Went back and double checked the post. From engine, tail pipe, mid Cherokee? Just started, flooring it, idle, downhill?? This will really narrow down. You say blow smoke, I think tail pipe while warmed up... But you keep mentioning the oil pan. Oil pan would not blow from pipe...details please! ;-)
Thread Starter
CF Veteran
Joined: Nov 2011
Posts: 1,290
Likes: 0
From: phoenix az
Year: 1989
Model: Cherokee
Engine: 4.0l 6 cylinder
Originally Posted by cruiser54
Like you Juan, I am totally confused at this point.
It is blowing smoke out or the tail pipe kind of a fait white smoke while its running even after ive been driving it for awhile I have not been able to see if its smokong while accelerating and decelerating due to the fact I cant see the tail pipe while driving
Senior Member
Joined: Aug 2011
Posts: 760
Likes: 6
From: Landers, CA
Year: Several
Model: Cherokee
Engine: 4.0
She filled it too full - then it smoked.
You drained some out - good.
How many miles driven since?
When it was overfull, oil got in the exhaust - cat, muffler, pipes etc - depending on how much got in there, it takes time to burn off.
Give it 100 miles - bet it'll be fine before then.
Why does everyone think the worst?
What happened to common sense?
You drained some out - good.
How many miles driven since?
When it was overfull, oil got in the exhaust - cat, muffler, pipes etc - depending on how much got in there, it takes time to burn off.
Give it 100 miles - bet it'll be fine before then.
Why does everyone think the worst?
What happened to common sense?
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
rrich is correct. Give it some time. If you suspect rings, do a compression test dry, then wet. Valve seal failure is fairly common on 4.0s. That could be all this is.
And oil pressure has nothing to do with smoking.
Senior Member
Joined: Aug 2011
Posts: 760
Likes: 6
From: Landers, CA
Year: Several
Model: Cherokee
Engine: 4.0
AAAND - If the leak has burned onto the pipes it may take a long time to burn off - even hundreds of miles.
Scrape it off, then clean it with carb cleaner.
Even then it may still smoke for a while.
IF it's coming out the tailpipe, catch some on a white rag - you'll see what it is.
white/blue, steam, oil, ATF etc - subject to interpretation
The problem with a compression test is - always good to do - often oil control rings don't show as low compression.
Getting lots of blow by?
After 50+ miles, tell us WHEN yoiu see the smoke. Idle, cruise, acceleration, deceleration? All are different causes.
Scrape it off, then clean it with carb cleaner.
Even then it may still smoke for a while.
IF it's coming out the tailpipe, catch some on a white rag - you'll see what it is.
white/blue, steam, oil, ATF etc - subject to interpretation
The problem with a compression test is - always good to do - often oil control rings don't show as low compression.
Getting lots of blow by?
After 50+ miles, tell us WHEN yoiu see the smoke. Idle, cruise, acceleration, deceleration? All are different causes.
Last edited by rrich; Sep 20, 2012 at 05:45 PM.
Senior Member
Joined: Aug 2010
Posts: 692
Likes: 1
From: Tempe, AZ
Year: 1990
Model: Cherokee
Engine: l6 242
Is this a new "old wive's tale"? What o-rings? Oil rings?
rrich is correct. Give it some time. If you suspect rings, do a compression test dry, then wet. Valve seal failure is fairly common on 4.0s. That could be all this is.
And oil pressure has nothing to do with smoking.
rrich is correct. Give it some time. If you suspect rings, do a compression test dry, then wet. Valve seal failure is fairly common on 4.0s. That could be all this is.
And oil pressure has nothing to do with smoking.
any improvement though, Steve?
Thread Starter
CF Veteran
Joined: Nov 2011
Posts: 1,290
Likes: 0
From: phoenix az
Year: 1989
Model: Cherokee
Engine: 4.0l 6 cylinder


