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I have a 175 mercury V6 1987 it will not rev past just over idle what could be wrong

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Some ford cpu\'s have a safety program that reduces the engine to very low power when the engine overheats or other serious fault is registered by the cpu. It is generally known as the sneak home mode and allows you to get off the road before something serious happens. Check for fault code . check for water in the radiator . check oil level. check tranny for oil level and burnt oil. See a dealer if the problem persists

Posted on Jan 19, 2013

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Posted on Jan 02, 2017

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roniecon
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SOURCE: Rebuilt the 4.6 in 2004 f150. Now it won't rev

sounds like the timing i off just a tooth or so.

Posted on May 24, 2010

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1 Answer

Engine starts and runs fine,but, on idle it has a regular missfire, when slowing down from high revs it tends to oil up the bottom plug


have a compression test done ( dry and wet )
could be a ring problem or a valve problem
the oil is being sucked past either the valve stem seal or past the rings from the 22" mercury vacuum on deceleration on the bottom cylinder

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sounds like the timing i off just a tooth or so.

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When idle the engine revs up and down by its self


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Ticking in motor, then stops for about a month, then starts ticking again. oil changed. in nuetral it wont rev past 3500 rpm


It wont rev past 3500 in driving?
The governer on these is set to NOT allow a higher rev when car is stopped and not in gear.
Try to change oil viscosity or filter manufacturer.Some filter manufactures put in a bypass valve that kicks in too early.

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