2000, 4x4, 4.0L 6 cyl engine running very rough - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 03-15-2008
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Icon8 2000, 4x4, 4.0L 6 cyl engine running very rough

its a 2000 4X4 with a 4.0L 6 cyl engine.
it running very rough at idle, rough when cold but when the engine is finally warmed up it runs even rougher, no power, shakes and shudders under a load.
i brought it to a mechanic and he checked wires, plugs, coil pack, compression test and vacumm test all passed.
I have also noticed when the truck is good and warmed up a sulfury smell comes out of the tail pipe.
could this be a catayltic converter problem? what i have missed in trouble shooting? would a ignition module be the problem?
getting ready to pull my hair out!!!
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Old 03-15-2008
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Does it only do it at idle or all the time?
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Old 03-15-2008
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idles rough all the time. runs terrible when driving, shakes and shudders.
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Old 03-15-2008
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Sounds like a clogged cat converter...

Also clean your MAF and check your oxygen sensors while your at it.

Last edited by WowMike2001; 03-15-2008 at 11:04 PM.
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Old 03-16-2008
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thanks for the info and help!

i'll check and clean the MAF. I'm going to check the resistance on the ignition module also.
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Old 03-16-2008
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Sorry to hijack the thread but how does one check an o2 sensor? My truck has 168k on it and i'm sure they have never been replaced. Also I have never seen the trouble codes for them come up when I check for codes.
Thanks
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Old 03-17-2008
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Quote:
Originally Posted by mht95ranger View Post
Sorry to hijack the thread but how does one check an o2 sensor? My truck has 168k on it and i'm sure they have never been replaced. Also I have never seen the trouble codes for them come up when I check for codes.
Thanks
Minus reading data directly from it and making sure its operatin gwithin parameters.. the only 'real' way to check it withotu the handy dandy computer tools is to unscrew it and make sure it isnt looking nasty as all heck.. thats about the best assumption I can make fo rthat. if they are still stocker son yoru truck, or at least over a hundred thousand miles.. I would probably recommend changing them.
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