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I have 96 ford ranger with the 4.0 v6. A few months back, it started having a rough idle at startup if the engine was warm. The idle goes back to normal after about 30 seconds. Lately, I am having to crank it for a long time before it will start if has not been run that day.

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  • Cars & Trucks Master
  • 9,324 Answers

There is a check valve in the fuel pressure regulator that maintains pressure when the engine is off. Test it. The fuel filter may be starting to plug up too.

Posted on Dec 06, 2014

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 59 Answers

SOURCE: 97 Ford Ranger 4.0L V6 Idles rough only when cold

Orand

Ther is a air Idle control valve located on the side of the throttle body. unplug it remove it spray it and clean it with carb cleaner replace it plug it back in and you will be a Happy person again.

Lugnut61

Posted on Feb 01, 2009

chuck943
  • 783 Answers

SOURCE: 2000 Ford Explorerer rough idle When cold

what codes are present? If it is lean codes P0171/P0174 problem is most likely the orings leaking between upper and lower intake manifold if this is a 4.0L

Posted on Feb 11, 2009

  • 67 Answers

SOURCE: 1990 ford ranger 2.3L running rough at idle and while driving

Hi check all the fuse. fi the fuse are ok . remove the coil pack and reverce if the cly missifire change replace the coil if not chage replace the electronic comtrol module ok.

Posted on Apr 20, 2009

  • 80 Answers

SOURCE: Rough Idling, start-up early morning, until engine heats-up

this may be a sticking air flue meter take a matchstick .and push it into the hose this will let more air in if this works change the air flue meter

Posted on May 04, 2009

  • 275 Answers

SOURCE: 2003 Mazda Tribute will start, idle rough for a

check the fuel filter air filter and vacuume lines if they all good make sure the spark plugs are making a bright blue spark

Posted on Jan 20, 2010

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I have a 1998 Ford Ranger that when I start it up runs a little rough for about 2 minutes then has a good smooth idle. When I step on the gas there is no power like it wants to stall. It only goes to a...


A possibility:

I have a 1998 Mazda B2500 (same truck/engine/trans). A few years back, I was getting a rough idle a few minutes after startup, and my tachometer would fluctuate wildly. This progressed to the point where I was stalling out randomly while driving. With the help of my local mechanic, I ended up diagnosing it as a mass airflow sensor error. My best guess is that oil or water had gotten into the intake. Whatever the cause, after replacing the sensor (saw them for $60 on eBay, right after I paid $300), it's been running smoothly since.

P.S. -- I don't think this is a mileage/wear and tear issue so much as it is bad luck. I only had 13k miles on the truck at the time.

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