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08-05-2013, 03:26 PM
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Attack of the 2wd!
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Join Date: Jul 2011
Posts: 73
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Random misfire
I have a random misfire that comes and goes, it seems to affect all the cylinders and it drags the engine down. It seems to happen in the middle of the power band, there are no codes, engine has 203k miles with a alot of new parts including coil pack, wires, and plugs.
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98 ranger 3.0 200k+ miles, Bedliner paint w/ 3 inch body lift, 31" Goodyears, Custom exhaust w/ headers, Rollbar and brush gaurd, CUSTOM DENTS!
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08-05-2013, 05:57 PM
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Ford Ranger Driver
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Join Date: Oct 2011
Posts: 8,818
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Re: Random misfire
Camshaft synchronizer ?
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08-05-2013, 06:04 PM
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Attack of the 2wd!
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Join Date: Jul 2011
Posts: 73
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I replaced the cam synchro and sensor along with the crank sensor and injectors
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98 ranger 3.0 200k+ miles, Bedliner paint w/ 3 inch body lift, 31" Goodyears, Custom exhaust w/ headers, Rollbar and brush gaurd, CUSTOM DENTS!
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08-06-2013, 10:33 AM
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Ford Ranger Driver
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Join Date: Aug 2012
Posts: 1,942
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Re: Random misfire
Did you position the cam sync correctly? Not to be a smart a$$, but it's easy to get it off a tooth in either direction. Could be the MAF too.
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08-06-2013, 12:48 PM
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Attack of the 2wd!
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Join Date: Jul 2011
Posts: 73
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Cam synchro came with an alignment tool and i put it at tdc, the mass air flow sensor is a refurb from advanced auto. I clean it with mass air flow sensor cleaner
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98 ranger 3.0 200k+ miles, Bedliner paint w/ 3 inch body lift, 31" Goodyears, Custom exhaust w/ headers, Rollbar and brush gaurd, CUSTOM DENTS!
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08-06-2013, 12:52 PM
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dumpster fire
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Join Date: Sep 2010
Posts: 5,363
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Re: Random misfire
what plugs and wires are you running?
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2017 Ford Fiesta ST
2014 Ford Escape Titanium Ecoboost AWD
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08-06-2013, 01:30 PM
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Attack of the 2wd!
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Join Date: Jul 2011
Posts: 73
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Motorcraft finewire oem plugs and autolite professional wires, i always run premium gas in it too
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98 ranger 3.0 200k+ miles, Bedliner paint w/ 3 inch body lift, 31" Goodyears, Custom exhaust w/ headers, Rollbar and brush gaurd, CUSTOM DENTS!
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08-06-2013, 06:00 PM
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Ford Ranger Driver
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Join Date: Oct 2011
Posts: 8,818
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Re: Random misfire
Well, the premium gas is a waste of money, but if it makes you feel better...
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08-08-2013, 10:32 AM
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Attack of the 2wd!
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Join Date: Jul 2011
Posts: 73
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I was doing some reading online and read that a dying battery or alternator can cause a misfire is the voltage drops below 12v. My misfire started last year before winter when my wifes car had a bad battery and i jumped it with my truck, half way through the jump my truck bogged and idled kinda rough then went back to normal so i never thought anything about it. Ive also read duralast alternators are prone to failure! I have a new duracell battery with 900 cca and a 2 year old duralast alternator. Ill have it tested soon!
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98 ranger 3.0 200k+ miles, Bedliner paint w/ 3 inch body lift, 31" Goodyears, Custom exhaust w/ headers, Rollbar and brush gaurd, CUSTOM DENTS!
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08-08-2013, 10:38 AM
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Learning to use the forums
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Join Date: May 2013
Posts: 1
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Re: Random misfire
as I am a new member I hope this the right way to do this: I have to change no. 3 injector on my 3.0 f/f I am not sure what all I need to remove to get to it at this point any info is very much appreciated 2000 3.0 f/f ranger 4x4 Thank You
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2000 Ford Ranger 3.0 Flex fuel stock
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06-13-2014, 03:56 PM
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Attack of the 2wd!
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Join Date: Jul 2011
Posts: 73
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Re: Random misfire
Turns out it was a bad gas tank seal and water was mixing with the ethanol in the tank and sinking to the bottom. I fixed it in january, just thought id post an update.
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98 ranger 3.0 200k+ miles, Bedliner paint w/ 3 inch body lift, 31" Goodyears, Custom exhaust w/ headers, Rollbar and brush gaurd, CUSTOM DENTS!
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