1997 ford ranger p0171 p0301 p304

mark25187187 · **Joined:** Tue Nov 18, 2008 12:38 am **Posts:** 3

try to figure what direction to look. the truck misses at idle, on the freeway i runs alot smooth but when shifts and the rpm's are lower the miss gets really bad. new plugs, also when you pull the wire for the number one cylinder i doesn't change the way it's running.

Sponsored Links · **Joined:** 29 Jun 2004 08:12 pm **Posts:** N/A

FergusonTO35 · **Joined:** Mon Sep 08, 2008 9:35 pm **Posts:** 154

What engine does your truck have and how many miles are on it?

mark25187187 · **Joined:** Tue Nov 18, 2008 12:38 am **Posts:** 3

4.0 engine 115000 miles

FergusonTO35 · **Joined:** Mon Sep 08, 2008 9:35 pm **Posts:** 154

New spark plug wires would be my next step, you obviously have no spark to one, possibly two cylinders. As I recall, the plug wires on this engine are routed right next to some very hot engine parts. I would make sure they're not touching anything and getting burned.

dnold · **Joined:** Thu Nov 13, 2008 9:49 pm **Posts:** 35

Have you checked compression? Have replaced 2 sets of heads in the past week with valves sunk way into the heads. About the right mileage to need new heads on this engine anyway.

mark25187187 · **Joined:** Tue Nov 18, 2008 12:38 am **Posts:** 3

compression check is the next thing. new plugs and wires. still have 301 code. have good spark at plug.

1997 ford ranger p0171 p0301 p304

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