Question about 2004 Ford Expedition

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I HAD #3 SPARK PLUG BLOW OUT OF CYLINDER. HAD IT REPAIRED AND ALL NEW PLUGS, FUEL FILTERAND PCV PUT IN NOW TRUCK HAS A VERY FAINT ROUGH IDLE. ANY IDEAS

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#3 sparkplug is not firing at peak performance.
The engine block sparkplug hole had to be re-threaded in order to accept an adapter for the replacement spark plug. The sparkplug is sitting "higher" in the cylinder than the others (not as efficient).
It may even be a different sparkplug altogether in order to accommodate the adapter.

Add a silicone insulator gel (AutoZone $2) inside both boot ends of the sparkplug wires and re-seat them all.

Posted on Oct 01, 2009

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Posted on Jan 02, 2017

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CAR FLOODED, REPLACED MAS, SPARK PLUGS, FUEL FILTER, FLUIDS, AND FUEL PUMP DRIVEER MODULE...CAR NOW STARTS BUT VERY ROUGH IDLE AND DIES OUT IF YOU DONT KEEP FOOT ON THE GAS


remove and clean the idle sensor valve. pull out and clean the PCV valve (on top of the valve cover).blow out (from the inside) the air filter. do not apply gas until after your vehicle starts.

Apr 06, 2017 | 2002 Ford Focus

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VERY ROUGH IDLE NO EXCELERATION


Try a few if these ideas...

Priority Action Part Type Cause
1 Inspect Spark Plug Fouled, Damaged, or Broken Spark Plug(s).
2 Inspect Hose (PCV) Clogged or Collapsed PCV Hoses.
3 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s).
4 Inspect Distributor Worn, Damaged or Faulty Distributor.
5 Inspect Catalytic Converter Clogged or Faulty Catalytic Converter.
6 Inspect Fuel Pump Low Fuel Pressure.
7 Inspect TimingSet Slipped TimingChain or Worn TimingGear(s).
8 Inspect Knock Sensor Improperly Connected or Faulty Knock Sensor.
9 Inspect M.A.P. (Manifold Absolute Pressure) Sensor Faulty M.A.P. Sensor.
10 Inspect Throttle Position Sensor Faulty or Incorrectly Connected Throttle Position Sensor.
11 Inspect Mass Air Flow (MAF) Sensor Damaged, Loose, or Faulty Mass Air Flow Sensor or Circuit.
12 Inspect Air Cleaner Temperature Sensor Damaged or Faulty Air Cleaner Tempature Sensor.
13 Inspect Fuel Injector Pressure Regulator Faulty Fuel Injector Pressure Regulator.
14 Inspect Piston Ring Set Worn or Broken Piston Rings.
15 Inspect Timing Specification Incorrect Ignition Timing.
16 Inspect Fuel System Pressure Incorrect Fuel Pressure Being Delivered to Carburetor or Fuel Injection System.
17 Inspect Fuel Filter Clogged or Dirty Fuel Filter.
18 Inspect PCV Valve Plugged or Damaged PCV Valve.
19 Inspect Valve Burned, Worn, or Sticking Exhaust Valves.
20 check idle stop solenoid - if faulty, could cause rough idling
21 inspect distributor cap/rotor - if burnt, could cause loss of acceleration

Apr 18, 2011 | Chevrolet Cavalier Cars & Trucks

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I took my 2004 gmc envoy, 6 cylinder, in for new spark plugs and fuel filter. When i got it back the service engine light came on. I took it back and was told that it was a bad spark plug. I have taken...


I was having a similar problem with my 2002 Envoy. Usually when accelerating at 60 and 90km/h it would have almost like a clunk and idled rough.

I took it into the shop and they said a tune up would be the first step to correct the misfire (25 options to choose from!) After pulling the spark plugs the 5th and 6th didn't look right. As a result my mechanic ran a compression test.

The 6th cylinder is only putting out 80lbs of pressure where as the rest were putting out 195lbs (factory says it should be around 215lbs). His recomendation was new motor or new vehicle.

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Same issue with the rough idle with a warm engine 4.0 Ranger


i would think a plugged fuel injector on # 6 cylinder could be the problem,or a big vacuum leak at that cylinder
a valve burnt/stuck could be but you dont see much of that anymore
could be coolant leaking into cylinder from leaky haed gasket but you would have to add coolant every so often
i would check #6 cyl. spark plug after driveing around a while if it looks new, ie no deposits on it then an injector would be what i would change next

Mar 20, 2010 | 2004 Ford Ranger

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I followed the firing order installing a dist cap on a 91 camaro and still running rough What do I look for now


check plugs -plug gap-vacuum leak-fuel mix-fuel pressure-timing-pcv valve-egr valve-air filter-oil sludge build up-problem in heads[valves adjustment-burnt-weak springs if only changed wires do a complete tune-up and do a compression check

Mar 14, 2010 | 1991 Chevrolet Camaro

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Rough idle on 1989 4.0, smooths up at drive speeds. What do I need to check?


Start by checking spark plugs, if only one of your spark plugs are not in optimal conditions your cylinder will miss fire causing the rough idle.

Dec 28, 2009 | 1989 Jeep Wrangler

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Shakes while idling and sometimes stalls.


check for minor vacuum leak and map sensor,pcv,egr valve

Oct 13, 2009 | 2001 Chevrolet Blazer

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I have a 2001 Ford Escort. It was idling rough and starting to cut out when sitting at stop lights. I changed the plugs and within a week the Check Engine light came on. It is still idling rough but not...


Well the misfire in Cylinder 3 will commonly be that your plug has gone bad. If that is the only code that it is throwing out then it could be an array of things going on. It sounds though that you may have a throttle position sensor out or that you have your idle speed set too low. You will still have great response when gas is applied but sitting at lights the idle will be rough and sometimes bounce up and down.

Feb 23, 2009 | 2003 Hyundai Tiburon

1 Answer

Fuel injector


Higher octane is not going to help, it's only for high compression engines to prevent pre-ignition (knock). You should try a tune up. New fuel filter, air filter spark plugs and wires, pcv valve and a bottle of good fuel injector cleaner that you add first to gas tank then fill up with gas (Techron is a good option for this). The only situation where higher octane would help with an engine not requiring it is if there is heavy carbon buildup in the cylinders causing pre-ignition and even than it's a temporary fix until they can be properly cleaned.

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