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Symptoms of bad spark plugs

2002 ford focus I have a code po 301 po302 po304 and p1405 I changed the spark plugs because it was running ruff it ran for a day now wont start. what do these codes mean?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

dennymulford
  • 1055 Answers

SOURCE: 1999 Ford E250 van Rough running

complete tune up plugs wires distributoe cap and rotor

Posted on Jan 24, 2009

Molson02536
  • 3854 Answers

SOURCE: Check engine light

A multi misfire may mean that one or more of the following has happened:
Faulty spark plug or wires, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector(s), Stuck/blocked EGR valve / passages, Faulty camshaft position sensor, Defective computer.

The engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wire, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the the problems were faulty fuel injectors. 

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Good luck and hope this information helps, keep me posted, be glad to help you get the truck running 100% again. Not sure if your running a K&N air filter, and if you are there may be a flim of oil on the MAF sensor that is making you run lean. You may want to spray down the MAF sensor with a can of MAF cleaner. 

Posted on Jul 02, 2009

geaeri95
  • 127 Answers

SOURCE: 2002 ford escape xlt eng codes po302 ?????

Zeevert was right about all but one thing. Cylinder two is the rear middle cylinder on a V6 or the second one from the passenger side on a 4 cylinder.

Posted on Oct 10, 2009

SQUIRESXX
  • 486 Answers

SOURCE: 2001 Focus PO304 code. Nothings worked!

the code is normally the air feed from the turbo intercooler to the inlet manifold, leaking, or the wastegate on the turbo sticking

Posted on Dec 27, 2009

  • 3640 Answers

SOURCE: 2002 ford windstar

po303 is cylinder 3 misfire, po304 is cylinder 4 misfire, po305 is 5 cylinder misfire. this means it could be bad plugs, wires. or coils that are bad. change plugs and see how it is running.

Posted on May 18, 2010

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1 Answer

2003 acura tl error codes po301 po302 po304 po306 p1399 po300


PO300 and P1399 are random cylinder misfire detected.
PO301 cylinder 1 misfire
PO302 cylinder 2 misfire
PO304 cylinder 4 misfire
PO306 cylinder 6 misfire
I would say that you have damage to the ignition wiring harness or you ECM is failing.

Feb 17, 2015 | Acura Cars & Trucks

1 Answer

2001 windstar im getting codes po172 po174 po301 po302 po 303 po304 po300 installed new coil pack twice new wires,plugs,cam and crank sensors,fuel andair filters,pcv valve and now get these codes. ...


Get your ECM replaced. Usually it's next to battery or inside front fenders. The rain must have shorted out connections and fried ECM. Engine will sputter until it is done. Usually autozone, advance auto, or dealer has ECM.

Apr 14, 2014 | 2001 Ford Windstar

1 Answer

2006 ford freestar po304


Code 300 is a random miss not serious enough to peg a cylinder, code 302 is for cylinder 2 and code 304 is cylinder 4. Code 402 is for an EGR flow problem.
Its possible the EGR problem is causing the missfires. The computer sets the 300 codes when RPM drops on a cylinder. The computer does not know why. So it could be spark, fuel, compression, or a vac leak.

Jun 28, 2013 | Cars & Trucks

1 Answer

Po302 code also po316 code


Put the old coil back in #2 & walk the new one to another cylinder

PO Codes are wrong, as many times as correct on a ford

Forget the 316

Your best to look at fuel trim with a professional scan tool
& cylinder misfire counts in Mode #06 also

Those trucks have leaking injectors some times, but that isn't
the code your getting

Spark plugs can't be in there over 3 years

The front 2 oxygen sensors have to be replaced at 100,000 miles

Do those 2 items & then diagnose the misfire or walk the coils

Feb 12, 2013 | 2003 Ford Expedition

1 Answer

Po302 po304 po307 po171 codes are showing up, any ideas?


PO 301 thru PO 308 are engine cylinders with possible
misfires & bad coils

PO 171 is a lean condition on Bank# 1 oxygen sensor

If the front or upstream sensor are over 100,000 miles, change
them as preventative maintenance

The cylinder misfires have to be diagnosed & tested any of
several ways,professionally for the most part

Jan 15, 2013 | 1999 Lincoln Town Car

1 Answer

Have a 03 ford focus and seems like i have the codes po 302 and po 316 not sure what could be the problem or what i can do to fix it?


Why is that?
You had the codes pulled,you don't know what they are?

PO302--Misfire on cylinder # 3
Po 316--Disregard,Misfire first 1000 Revolutions.

Oct 11, 2010 | 2003 Ford Focus

2 Answers

Code po304 #4 cylinder mis fire


ck if you have spark at the coil for that cylinder. check the plug wire closely. if it has spark at the coil, then replace all the spark plug wires.

Oct 12, 2009 | 2000 Cadillac DeVille

1 Answer

96 ford taurus ran fine yesterday go on 25 mile trip half way through trip engine runs ruff. Like miss firing just changed plugs about two weeks ago it idles ruff but runs doesnt stall at all. baffeled


sounds like spark plugs or spark plug cables are bad and it is in fact misfiring this happened to me in my car and my spark plug cables were bad

Aug 29, 2009 | 1996 Ford Taurus

2 Answers

2002 ford escape xlt eng codes po302 ?????


Zeevert was right about all but one thing. Cylinder two is the rear middle cylinder on a V6 or the second one from the passenger side on a 4 cylinder.

May 16, 2009 | 2002 Ford Escape

2 Answers

2002 ford windstar showing obd2 codes po303,po304,po305 and idiling ruff and wont run over 45 mph and has low miles, how do i fix it ,thanks sincerely mark


might be the coil pack is bad, wires, plugs, o2 sensors, dirty injectors, catalic converter ( only if you smell rotten eggs ) . cylinders are misfireing.

Mar 23, 2009 | 2002 Ford Windstar Cargo

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