99 Ranger 4.0L with the possibility of an internal coolant leak. | Ford Explorer Forums - Serious Explorations

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99 Ranger 4.0L with the possibility of an internal coolant leak.

Fixing Ranger

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Joined
January 14, 2010
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City, State
South Berwick, Maine
Year, Model & Trim Level
99 Ranger
My Ranger has been sputtering around 40mph and 2000 rmp's, with rough starts in the morning. It has also been loosing small amounts of coolant and I have a lot of white smoke (steam) coming out of the tail pipe. I do not have any coolant leaking external. I have pressure tested the heads and all 6 cylinders held at 145psi for several minuets. I also pressure tested the coolant system and lost pressure very quickly. If the heads are holding pressure were is the coolant leaking?

Thanks,
 






Sounds like a Headgasket, cracked head, or cracked block. Does the "white smoke" have the faint smell of antifreeze? Which 4.0 do you have? OHV or SOHC?
 






Welcome to this forum! I've renamed your thread, and moved it into the Ranger section.
 






Thanks, this has been a learning experience. No coolant leak, just air from changing the water pump. Found some bad injectors and replaced them. But, now receiving codes for running rich on both banks?
 






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