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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. Cummins 5.9L/ NV4500 5 speed swap in the works
1974 F100 Ranger XLT 390, C6 3.25 axle. Dad bought it new.
1983 Mazda RX7 1.1L Rotary.
1984 CRX 35 MPG go kart
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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