Question about 2004 Ford Explorer

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2004 ford exploerer misfiring. Fuel injector cleaner has been added, plugs and wires have been replaced and vacuum leaks were discovered and repaired and vehicle is still doing the same thing

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If it is a constant misfire, you can use a laser thermo to measure exhaust temp. The one that is missing will be about 20 degrees cooler. Once located, you can use a noid light to determine if the system is telling the injector to fire. You can also use a noid light to check the individual coils if your explorer uses them. Remember the four things an engine must have are:

  1. proper air/fuel mix
  2. spark
  3. compression
  4. timing

Posted on Sep 29, 2009


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I get a random misfire code when my engine is idling on my 04 isuzu 3.5L...i have changed sparkplugs, check all coils, replaced fuel injectors and still get same error message...what should i check ne

you could have a vacuum leak somewhere. check the fuel filter, it may be going bad. and battery. all these will cause a random misfire code. as well as your plug wires. intake air leak, spray carb cleaner around intake manifold while engine is running if the idle changes, then you have a leak. Good-day! but check for vacuum leak first! a vacuum leak will cause engine to hesitate and lose power.

Apr 30, 2014 | 2004 Isuzu Rodeo S 3.5L V6

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Rpm problems with no check engine light on

If the RPM is high check for a vacuum leak. Examine all vacuum hoses for cracking or disconnections. If no problem is found, spray carburetor cleaner on the intake manifold and any other gasketed areas on the top of the engine. If, when spraying, the engine RPM fluctuates, then suspect a gasket leak where the spray is entering the engine. Also check throttle body for sticking. Clean it with carburetor cleaner.

Low RPM could indicate a clogged fuel filter, low gas, dirty or bad fuel injectors. If engine idle is low because it is running poorly (e.g., a misfire), check engine for misfire. Misfires can be caused by bad spark plugs, bad spark plug wires, bad fuel injectors, a bad coil pack, low compression in a cylinder, etc. Check the obvious cheapest things first.

If RPM is varying up and down, check Idle Air Control Valve (IACV) for sticking or obstructions. You may need professional help at this point.

Feb 05, 2014 | 1996 Ford Mustang

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My '04 Alero 6 cylinder has a #2 cylinder misfire. I have changed the plugs, ignition wires, and the coil pack. Is there any other reason this problem continues to happen?

Sure, there are LOTS more possible reasons including:

> Blown head gasket
> Burned valves
> Broken valve spring
> Collapsed valve lifter
> Bad fuel injector
> Fuel injector circuits open or shorted
> Vacuum leak at intake manifold runner
> Vacuum leak at injector O-ring
> Worn-out or broken piston rings
> Cracked piston
> Cracked cylinder head
> Worn camshaft lobe
> Defective Powertrain Control Module

To put it simply, proper diagnosis needs to be performed in order to eliminate the possibilities and get to the root of the problem so you do not end up spending your life savings on parts that your car does not need. As you have probably discovered by now, diagnosis by parts replacement can get very expensive very quickly.

Nov 28, 2011 | 2004 Oldsmobile Alero

1 Answer

The service engine light came on - code was P0305 The coil, spark plug and wires all replaced. Fuel injector cleaner added. After, the service engine light flashes on then off - code P0174

Must be a full moon today & repair shops purposely
do poor work this week

This site is unbelievable

You gave use no vehicle what so ever

We only guess here anyway, so what the heck

The PO 305 usually is a COP ---individual coil-on plug
related problem -- for cylinder #5 last number of code
301 thru 306 or 8

With that there are no spark plug wires

Injector cleaner --- think about 16 oz in ten or more gallons
of fuel. Really do much,not in my 47 years experience
Won't hurt,but won't fix anything. If it was necessary or did
work it would be recommended in your owners manual & come with the car

Now the PO174 is an O2 Sensor Code so common I think
we all have one

System too lean on Bank 2
In your case that is the passenger side most likely

80% of O2 Codes are Vacuum leaks & a misfiring coil,
that your shop can't figure out doesn't help

Bottom line: few places seem to like or be able to fix a ford
Seriously,including some dealers,how is that. I have have no problems

Let go further

Spark Plugs--are they replaced every 3 years & not over 60,000 miles
O2 Sensors --replaced at 100,000 miles front 2 only,ones in inlet of converter
MAF Sensor cleaned once or twice a year
All ducting from air filter to throttle body--- leak free
NO VACUUM LEAKS ANYWHERE --ducting,intake,EVAP System,exhaust system

Your shop needs to actually use their scan tool in mode $06 & drive the car
& look at misfire counts & any number of other data

A new repair shop would be my suggestion
Sloppy work for sure

Aug 04, 2011 | Ford Windstar Cars & Trucks

2 Answers

My number 3 spark plug is misfiring i tuned it and its misfiring

Tuned-How -Spark plugs??

You have a misfire, you say on #3,
that isn't a plug issue

Have you tested the ignition module

Have a scope put on secondary ignition,
so you don't keep throwing parts at it

Feb 14, 2011 | 2004 Ford Freestar

2 Answers

My car keeps shaking and it like wants to stop

fuel or fire its one of them replace fuel filter change plugs wires cap rotor could be a cloged fuel injector or a vacum leak good luck

Feb 12, 2011 | 1993 Oldsmobile Cutlass Ciera

1 Answer

I have a 2003 ford focus , I am having a misfiring problem. I have replaced spark plugs, wire, coil pack, air filter, fuel pressure sensor, replaced injectors 3 and 4 in which that the misfiring code....

Check for Intake Manifold leaks with either a water mist from a spray bottle or Choke cleaner. Do this while the engine is running and you will know about a leak with an RPM change. I read about some intakes were 2 piece and the intermediate gasket leaks.

Also you could clean the MAF on the air intake with Electric cleaner. If you have an old fashion Vacuum gauge you could plug in and see how steady Valves are closing by watching the Vacuum bounce from misfires.

Would like to know results on this case.

Nov 03, 2010 | 2000 Ford Focus

1 Answer

Engine runs rough at idle and bucks at highway speed. Check engine light was on after fuel injector cleaner was added to gas, the chek engine light ent off.Scan tool indicated no. 1 cylinder misfire prior...

I had a similar problem in a 1994 Taurus, and after spending nearly 300$ on ignition parts, it turns out the problem was a bad spark plug wire that cost me 8.88$ to replace.

Mar 01, 2010 | 2001 Ford Taurus

2 Answers

Cylinder 1 misfire

First step is to check the plugs; hearing a lot online about this being a fuel injector problem. You can try injector cleaner, check the plugs and wires (clear the code) and see if this clears your problem.
If not, it's likely fuel injector(s) is bad.

May 06, 2009 | Dodge Ram 1500 Cars & Trucks

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