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  #1  
Old 11-02-2012, 07:35 AM
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Default Rough Idle, Flashing Engine Light, Strong Exhaust

The truck starts fine, but the exhaust has a strong smell. After driving a few minutesand stopping at a light, the engine light begins to flash and the engine idles very rough. It has a loss of power and is hard to start off from a stop. If I keep the RPMs above 2000, the engine light stops flashing and the engine levels out. I had the codes checked at Autozone and it came back cycl 4 misfire. I have changed plugs, wires, coil pack, fuel filter, air filter, #4 injector, cleaned the MAF sensor & IAC valve. I have checked for vacuum leaks and found nothing. What next?
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  #2  
Old 11-02-2012, 08:33 AM
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Default Re: Rough Idle, Flashing Engine Light, Strong Exhaust

Check you exhaust. Does it have a sweet smell to it? If so change your oil and see if there is any coolant in it. Sounds like you might have a blown head gasket.
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2004 F-150 FX4 Supercab, Dark Shadow Grey, 5.4 liter Triton V8, Flowmaster Cat Back exhaust, K&N Drop-in, Intake "Gotts" Mod, Edge Programmer, 2.5" Level, Front tow hooks, 33" Falken Rocky Mountain ATS
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  #3  
Old 11-02-2012, 10:48 AM
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Default Re: Rough Idle, Flashing Engine Light, Strong Exhaust

A bad cat does not cause a cylinder 4 misfire.

You've replaced all the stuff specific to cylinder 4 that you can replace. Which leads to more difficult things. Bad head gasket leaking into that cylinder? Blown piston rings in that cylinder? Things like that.
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  #4  
Old 11-02-2012, 11:35 AM
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Default Re: Rough Idle, Flashing Engine Light, Strong Exhaust

Quote:
Originally Posted by westreese View Post
The truck starts fine, but the exhaust has a strong smell. After driving a few minutesand stopping at a light, the engine light begins to flash and the engine idles very rough. It has a loss of power and is hard to start off from a stop. If I keep the RPMs above 2000, the engine light stops flashing and the engine levels out. I had the codes checked at Autozone and it came back cycl 4 misfire. I have changed plugs, wires, coil pack, fuel filter, air filter, #4 injector, cleaned the MAF sensor & IAC valve. I have checked for vacuum leaks and found nothing. What next?
I bet you have an exhaust valve issue .....I have seen it a few times.....I think there was/is a TSB for it.
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2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 113k.(6/5,2014)
I bought the truck from the OO in 8/1/2013 for $900. It had a burnt exhaust valve. I just threw some heads on it(5/1/2014). Ford has many good engines, the 3.0 Vulcan is not one of them. I bought it for the price.
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  #5  
Old 12-06-2012, 09:56 AM
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Default

What kind of wires did you install?
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