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

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Old 01-10-2011
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running terrible at times, then runs great.

thats best decribes what happening to my 1999 ford ranger 4.0 auto 4x4 truck.
it will run great after a tune up fuel filter air filter plugs and wires seemed good.
it has 150000 miles. but all of a sudden it starts losing speed 60mph slowing downto 30 to-0 mph and stalls. it starts right back up fine mostly skipping an flubbering. try and rev it up it won't rev up past 2000 rpm hold at 2000 and it may clean out and purr and rev great or it may keep flubbering.this happens idling,driveing,curising,stopping going it don't matter. cked vacurm found a leak and fixed it. this was all done to try and fix it. it did help when it runs now it runs great.but didn't fix it. thanks
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Old 01-13-2011
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why thank you
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Old 01-13-2011
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? i have a similar problem and i havent got a response yet.... its been over a week
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Old 01-13-2011
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Have you pulled the codes and if so what are they?
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Old 01-13-2011
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Quote:
Originally Posted by 46356 View Post
Have you pulled the codes and if so what are they?
check engine light did come on but don't have a tool to do that. waiting on one now.
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Old 01-13-2011
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If the lights on it threw a code. Most major autoparts stores will do free scan too.
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Old 01-14-2011
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Quote:
Originally Posted by 46356 View Post
If the lights on it threw a code. Most major autoparts stores will do free scan too.
so i'm finding out but it won't even stay running to get it there. its worse now then it was when i wrote this post.
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Old 01-14-2011
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102,103,131,136 are the codes had a meter didn't even know it. they are all P0.
P0102 Mass or Volume Air Flow Circuit Low Input
P0103 Mass or Volume Air Flow Circuit High Input
P0131 02 Sensor Circuit Low Voltage (Bank I Sensor I)
P0136 02 Sensor Circuit Malfunction (Bank I Sensor 2)
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Old 01-14-2011
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update its cold out. cleaned the maf sensor and let it dry and now the truck trys to start but just won't start. turns over fast and fires repeatedly but won't start.(run)
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Old 01-14-2011
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When was the last time the O2 sensors were changed? I had a similar problem, where it would idle rough, and stall randomly, or just seem to seize up when cruising. I replaced the bank 2 upstream, and the downstream and it already runs better. I plan on doing the third one this weekend, and hopefully it will be straightened out.
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Old 01-14-2011
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i've never change them. had a bad one on my old ranger but didn't do what this is doing. mechanis says to check for vacum leaks as far as the sensors go on ford
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Old 01-14-2011
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I guess your maf could be bad. I'd search the site to see if others have had one go bad. An 02 sensor wont cause your truck not to start, the computer just goes into a "safe mode" so......I'll do some research too.

Last edited by 46356; 01-14-2011 at 04:35 PM.
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Old 01-14-2011
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If you didnt live so far from me I'd take mine off and let you try it. Im guessing from having 2 maf codes that the sensor is bad.
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Old 01-14-2011
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Try to unplug the MAF, if it runs better, the MAF is done.
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Old 01-15-2011
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tryed that and right now it seems worse. it will fire with it plugged in but just seems to turn over with it unpluged.

plus thanks a bunch

Last edited by schl48; 01-15-2011 at 07:16 AM. Reason: add
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Old 01-15-2011
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Fire it up first, then unplug and try revving it.
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Old 01-15-2011
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won't start now. tryed it a couple times before and it was smooth at first then after 20 30 sec. it ran like crap
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Old 01-16-2011
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will a car or truck run with a bad maf senor. mine won't start so could it be the maf sensor
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  #19  
Old 01-20-2011
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god a pressure guage and a charged battery turns over fast and i get around 30 lbs. any good.
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