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i bought this 99 ranger supposedly in good running condition, BUT you all know what's coming right. i had my nieghbor put his scanner on and he says it may have a broken or weak valve spring on no.2 cyl. now since he is remodeling his son's house he don't have time. so i need help from some of you guys. i need step by step how to change a valve spring in an overhead cam engine. thanks, rick
A misfire can be caused by many things, such as a bad plug/plug wire, coil problem, or fuel injector issue. Even a small vacuum leak can cause a single cyl to have a misfire.
Yes, a weak or broken valve spring can cause this, but check the external stuff first. Especially if the misfire is intermittent.
1980 F-150 300 I6, C6 & 9" rearend. The workhorse. 300K+
1974 F100 Ranger XLT 390, C6 3.25 axle. Dad bought it new, drove it over 500K. Now that he can no longer drive it came to me. Value: Priceless.
1983 Mazda RX7 1.1L Rotary. The show/autocross/toy. 231K
1995 Mazda B2300 (undercover Ford)
thanks Mr. Rogue, apperantly a broken or weak valve spring can be fixed by changing to
a lighter weight oil. i put 10w40 in when i changed the oil my mech. found a thech paper from ford saying use 5w20 because heavier oil stayed in the lifters causing them to hold th valve open. i changed to 5w20 and so far the engine is running ok, so i guess i'll wait to see the outcome.
Last edited by sawz5; 07-03-2012 at 10:04 PM.
Reason: left out some info
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