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Old 02-16-2018, 07:30 AM
Mailman1 Mailman1 is offline
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Join Date: May 2012
Posts: 71
Default P0301 on a 99 4.0 Ranger

OK here's my problem. A couple days ago my p/u started running rough and came up with a code P0301 (cly 1 misfire). checked the # 1 plug and found a ton of crud on it (pictures) sort of tan/sand color. I changed the plug and also checked #2 & #3 and were the same way but not nearly as bad. I replaced 2 & 3 and also 4, 5, & 6 which looked normal. I tried a different plug wire, different coil pack, checked the # 1 injector (OK) and also vacuum lines (OK), cleaned the mass sensor, but wondering what I might of missed to still cause what sounds like a miss on #1.IMG_5215.jpg

IMG_5217.jpg
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Old 02-17-2018, 06:57 AM
Mailman1 Mailman1 is offline
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Default Re: P0301 on a 99 4.0 Ranger

Since the last post I have checked the vacuum and it is in the green or normal and checked the compression on #1 which is around 75# and still had a miss, I then checked #2 cyl. and it was 95# so I am sort of leaning towards maybe the #1 injector might be plugged to cause the miss as the code P0301 still comes up after you run it for a while. ???
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