04 ranger v6 3.0L misfire under 1000 rpm
30

Asked by MWalk Nov 30, 2014 at 05:46 PM about the 2004 Ford Ranger 4 Dr XL Extended Cab SB

Question type: General

check engine light stays on. starts blinking, after a couple of minutes, when under 1000 rpm. 3 codes: P0316, P0420 and P0304 (misfire cylinder 4). Fairly new plugs and wires. Just changed plug 4 again but did not help. Runs great above 1000 rpm.

3 Answers
30,485

Tom answered 9 years ago

When you removed plugs ... were they brown, grey or black? Black could be worn engine or head gasket problem

1 people found this helpful.
Mark helpful
30

MWalk answered 9 years ago

Plugs looked good. I am sure the engine is worn some as it has 313000 miles on it. However, I have kept it in good shape running syn oil and changing it often. Most all miles are long distance highway miles.

Mark helpful

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