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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-28-2010
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sweet scented white smoke

Howdy, I'm having a problem with my Ranger. when i start my truck at any time of the day when the engine is Cold i get a large amount of smoke like clouds coming from my exhaust pipe, it is a white/light gray color with a sweet scent to it, this has been happening for about a month but is getting worse, it goes away after the engine heats up to normal temps. i have been burning a unusually large amount of coolant for this past month, maybe a quart every week. i have no loss of power, no rough running, no misfires, but it has been at a low idle of about 500 RPM's whenever i come to a stop. i have the 4.0 V6 A/T with 120,000 miles. i was hoping for some type of help or to be pointed in the right direction, maybe its something i can fix at home, i sure would like to save as much money as possible.

Thanks!!
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Old 01-28-2010
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sounds like a head gasket or cracked head. check your oil and see if theres any signs of coolant.
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Old 01-28-2010
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common problem on the 4.0 do a leak down test and it will tell you if em gaskets are bad i say thay are. may need new heads too
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Old 01-28-2010
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i agree, it's a head/head gasget issue, but, this issue MAY be as simple as you head bolts aren't tight, check the torque on them, to make sure they are all to spec, if they are, pull em off and see if it's a head gasget... leak down testers are expensive... head gasgets aren't all that much... and you are going to need them to fix this problem either way...

it could also be a cracked block... had the engine freeze with water only, in the radiator? or gone for a swim with a warm block?
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Old 01-28-2010
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i would agree with redrocket.
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Old 01-28-2010
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Maybe a bad intake manifold gasket.
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Old 01-28-2010
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If you have cracked heads look at it like this....It is a good time to up grade to performance heads...... if they make them for the 4.0.
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Old 01-28-2010
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Quote:
Originally Posted by --weezl-- View Post
i agree, it's a head/head gasget issue, but, this issue MAY be as simple as you head bolts aren't tight, check the torque on them, to make sure they are all to spec, if they are, pull em off and see if it's a head gasget... leak down testers are expensive... head gasgets aren't all that much... and you are going to need them to fix this problem either way...

it could also be a cracked block... had the engine freeze with water only, in the radiator? or gone for a swim with a warm block?
leak down testers are cheap 20.00 at the parts store. you can even do loan a tool on em

Quote:
Originally Posted by reader585 View Post
If you have cracked heads look at it like this....It is a good time to up grade to performance heads...... if they make them for the 4.0.
yeah at a thousand dollars a pop for a set
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Old 01-28-2010
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i have checked my oil when it was cold and then after warmed up and found no sign of any other substance but Oil, is there a chance that maybe it could be a bad Catalytic Converter? if it is a cracked head or a major problem like that where would i go to buy new parts so i can fix it?
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Old 01-28-2010
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no, it's not your cat, you have coolant loss, and the smell of coolant in your exhaust, along with steam... you can get heads at most parts stores, but i would try to get them from a JY, make sure you get a vehicle with rear end damage, that way it wasn't junked because of a bunk motor, and the vehicle damage isn't a factor in the motor...
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Old 01-29-2010
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OHV or SOHC?
Chances are you either have a blown head gasket or cracked head. In the even that you have to do a head gasket job, check between the intake and exhaust valves for cracks when you pull the heads. Have the heads magnafluxed. If they are both shot, save yourself the trouble and get two brand new heads. You can have a machine shop swap out your valves and valve springs depending on there condition.
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