Misfire i put new plugs and new wires and run and idles rough also

SOURCE: Cylinder 1 and 4 misfire on my 1997 Ford Explorer

The code description is a giveaway.
It could be one of the coils on the coil pack. Most coils nowadays do two cylinders each. This way car makers can get away with one coil for two cylinders.(lowers costs) One spark fires the air fuel mix in one of the cylinders and the other will fire the cylinder on the exhaust stroke. If the coils are removable, and you are fairly handy with cars,switch two around, the problem will follow the bad coil.

Mike Butler

• 6674 Answers
• Posted on Apr 19, 2009

SOURCE: Self-adjusting idle brain often idles 1500-2000rpm range.

Faulty oxygen sensor or low fuel pressure can also cause these codes to be set. I'd go for a fuel pressure test when acting up if at all possible just to confirm I have pressure needed. Have heard of coil problems as well. Should be a good blue 1" min. spark from coil.

SOURCE: P0302 #2 cylinder miss fire code. Replaced plugs

I have a 1999 ford escort 2.0, its got a miss on cylinder 3 and 4. I changed the wires and the coil pack but its still missing. When scanned I get code p1506, p0303 and p0304

ZJ Limited

• 17989 Answers
• Posted on Jan 27, 2010

SOURCE: firing order for a 2003 ford focus 2.0l

Check and verefy this firing order...

2003 Ford Focus 2.0 liter DOHC L4 VIN "5" and VIN "3"



2003 Ford Focus 2.0 liter SOHC L4 VIN "P"



Hope thats help.

SOURCE: u i have a 97 ford escort that idles rough so i

Often, on the Escorts of this vintage, rough idle can be due to a leak in the vacuum system. With the engine running, listen closely for any tell-tale hissing sounds coming from any of the vacuum hoses. Check that they are all securely in place and the end-clamps are all tight. Also check that the PCV valve and the hose connecting it to the manifold are securely in place. Another possibility is the Idle Air Control (IAC) valve. If it is clogged or sticking, it can cause rough idle. Refer to a service manual to diagnose the IAC valve. Other things to check: make sure that the air intake is unobstructed and clean. You might consider cleaning the manifold and throttle body. Check the air filter and replace if necessary. Let me know if you have any other questions.