4.0 smoking problem

Scott86MJ

Scott86MJ

Well-Known Member
Joined
May 3, 2006
Location
Dallas
My MJ has a 94 Xj 4.0 with 153000 miles, it has sit for 15 years and didn’t smoke before it was parked. I have another engine I’m planning on rebuilding and possibly stroking but I thought I might try the Berryman B12 piston soak that @Noel and @jcramsey have tried. I just removed the spark plugs, what do yall think of the condition? I’m thinking of ordering one of the bore scope to hook to my phone to look down in the cylinders.
Im going to take the MJ out once more before the season is over, it could not hurt to give it a try, right?
IMG_7726.jpeg
 
justjeepin86 said:
Valve stem seals?
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Scott86MJ said:
My MJ has a 94 Xj 4.0 with 153000 miles, it has sit for 15 years and didn’t smoke before it was parked. I have another engine I’m planning on rebuilding and possibly stroking but I thought I might try the Berryman B12 piston soak that @Noel and @jcramsey have tried. I just removed the spark plugs, what do yall think of the condition? I’m thinking of ordering one of the bore scope to hook to my phone to look down in the cylinders.
Im going to take the MJ out once more before the season is over, it could not hurt to give it a try, right?
View attachment 463345
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Smoke all the time or just after start up. Definitely won’t hurt to try the chemical rebuild first lol.
 
Noel said:
Smoke all the time or just after start up. Definitely won’t hurt to try the chemical rebuild first lol.
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All the time, its more noticeable when its sitting idling or going very slowly through the trails. It seems to clear up when you give it some RPMs.
 
It used a quart of oil at the get together and about a half quart at the vet ride.
 
Scott86MJ said:
It used a quart of oil at the get together and about a half quart at the vet ride.
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Try the chem tool. Valve seals can do it and aren’t too bad to change. Also take the pcv pipe off and see if that helps. It can suck the oil out of the motor and throw it in the intake
 
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