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09-18-2013, 03:27 PM
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Ford Ranger Driver
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Join Date: Jan 2009
Posts: 6,268
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Re: Missfire after plug change
I would compare one of those plugs to the old ones. make sure they are exactly the same. Washers and everything.
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)
2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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09-18-2013, 03:45 PM
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Liking the Ford Ranger Forum
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Join Date: Sep 2013
Posts: 20
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Re: Missfire after plug change
Firing order and wires are all correct. Regapped it and it starts and runs fine on high idle as it warms up it gets worse. Idle is sitting around 800rpms and still has a miss to it.
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09-18-2013, 03:46 PM
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Ford Ranger Driver
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Join Date: Jan 2009
Posts: 6,268
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Re: Missfire after plug change
Do you have the original MC plugs. Put 3 of then back in the passenger side.
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)
2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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09-18-2013, 04:05 PM
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Mr H....A....P...P....Y👿
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Join Date: Nov 2012
Posts: 2,911
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Re: Missfire after plug change
You've got serious detonation going on in two cylinders judging by the discoloration and coating that was burned off. do what modelageek said ,Seafoam the intake , fuel system, and get some maf cleaner and clean the mass air flow sensor.
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2014 F150 xl 3.7 6 speed auto.
Quote:
Originally Posted by pk9298
HELL TO THE NO!! Abort abort abort!! That's the first thing to go!!! Ewwwww! I'm not no vampire! I don't enjoy red tea
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09-18-2013, 04:09 PM
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Liking the Ford Ranger Forum
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Join Date: Sep 2013
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Re: Missfire after plug change
Just for the hell of it I pulled the rear two plugs on the passenger side. Middle gap was down to .50. The rear is down to .45. I'm throwing two of the five original plugs that I can find back in just to see. All the gaps on these 5 are at .60. Not touching the gap.
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09-18-2013, 04:12 PM
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Ford Ranger Driver
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Join Date: Jan 2009
Posts: 6,268
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Re: Missfire after plug change
Quote:
Originally Posted by CZ75
Just for the hell of it I pulled the rear two plugs on the passenger side. Middle gap was down to .50. The rear is down to .45. I'm throwing two of the five original plugs that I can find back in just to see. All the gaps on these 5 are at .60. Not touching the gap.
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Compare the old and new for size, etc
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)
2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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09-18-2013, 04:15 PM
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Liking the Ford Ranger Forum
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Join Date: Sep 2013
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Re: Missfire after plug change
Why would detonation pop up all of a sudden?
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The plugs are identical in shape and size. No washers, just shoulders on the plug body. Rear two are in. Going to fire it again and see what happens.
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09-18-2013, 04:18 PM
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Ford Ranger Driver
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Join Date: Jan 2009
Posts: 6,268
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Re: Missfire after plug change
Quote:
Originally Posted by CZ75
Why would detonation pop up all of a sudden?
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The plugs are identical in shape and size. No washers, just shoulders on the plug body. Rear two are in. Going to fire it again and see what happens.
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Is it under warranty?
__________________
2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)
2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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09-18-2013, 04:20 PM
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Mr H....A....P...P....Y👿
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Join Date: Nov 2012
Posts: 2,911
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Re: Missfire after plug change
If they gave you hotter running plugs that can cause detonation.
__________________
2014 F150 xl 3.7 6 speed auto.
Quote:
Originally Posted by pk9298
HELL TO THE NO!! Abort abort abort!! That's the first thing to go!!! Ewwwww! I'm not no vampire! I don't enjoy red tea
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09-18-2013, 04:22 PM
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Ford Ranger Driver
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Join Date: Jan 2009
Posts: 6,268
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Re: Missfire after plug change
What is the part # of the old plugs?
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)
2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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09-18-2013, 04:26 PM
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RIP 94 Ranger
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Join Date: Jul 2013
Posts: 188
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Quote:
Originally Posted by stateranger
If they gave you hotter running plugs that can cause detonation.
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This
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09-18-2013, 04:27 PM
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Liking the Ford Ranger Forum
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Join Date: Sep 2013
Posts: 20
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Re: Missfire after plug change
It should still have most of its warranty left. The NGK's could have been hotter. These Motorcrafts are direct replacements. It ran like crap with those two old plugs. Should I try gapping to .60 on all cylinders would the original plugs have burned equally away by .06 thou each in 86,000 km's? Whats that 53,000 miles?
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Agsf 24n
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09-18-2013, 04:47 PM
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Liking the Ford Ranger Forum
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Re: Missfire after plug change
Well. That failed miserably too. It sounded pretty good and was holding idle a little over a grand but as it warmed the rpm's dropped and it threw a light on. Think I may be off work on a sick day to get this thing sorted out.
So if the NGK's were hottier or offered less resistance would that have screwed up the coil?
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09-18-2013, 08:06 PM
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Ford Ranger Driver
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Join Date: Dec 2012
Posts: 663
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Re: Missfire after plug change
Need to find out what code it threw.
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09-19-2013, 07:01 AM
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2002 Mazda B4000 4 x 4
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Join Date: Sep 2013
Posts: 52
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Re: Missfire after plug change
Anyone ever heard of this or experienced it?
Water intrusion into a connector (X309) located under the cab, beneath the driver's seat, can cause a rough idle, erratic speedometer operation, ABS Light and Check Engine Light illumination, and automatic transmission shifting problems. If needed, connector repair parts are available from Mazda dealers, and possibly some Ford dealers.
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2002 Mazda B4000 4.0 4x4 auto trans,L/S 4.10s 2750 lbs capacity. ext cab. P245/75R16. Has off road package, towing package, cruise, tilt, auto dim rear view mirror, am fm cd, power locks and windows, and a leer camper shell.
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