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1999 Ford Ranger running rich

Tiny
CB8061
  • MEMBER
  • 1999 FORD RANGER
  • 190,877 MILES
Starts up idles high then comes down like its supose to idles good throttle about half let off it dies hard to get started, idles rough about 1 minute smoothes out idles good, throttle again let off real slow idles rough 1 minute smoothes out idles good. Clean plugs they get black again. Changed maf sensor, tps, fuel pressure regulator fuel filter, iac. Fuel pressure 65lbs.
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Tuesday, September 17th, 2013 AT 5:34 PM

9 Replies

Tiny
TY ANDERSON
  • MECHANIC
  • 684 POSTS
Have you checked for a vacuum leak any where pass the MAF sensor? A lean condition will cause the computer to enrichen the air fuel mixture. Vacuum leaks are common on these especaily on the intake tube and intake gaskets. Let me know what you find. TY
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Tuesday, September 17th, 2013 AT 5:46 PM
Tiny
CB8061
  • MEMBER
  • 5 POSTS
Yes I have checked for vacuum leaks, no leaks.
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Tuesday, September 17th, 2013 AT 5:53 PM
Tiny
TY ANDERSON
  • MECHANIC
  • 684 POSTS
Do you access to a scan tool that can read datastream (what the computer sees from the input sensors)?
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Tuesday, September 17th, 2013 AT 5:55 PM
Tiny
CB8061
  • MEMBER
  • 5 POSTS
Yes a snapon scanner. Forgot to tell you no cil, no codes, scanner shows every thing fine, it doesn't even show rich mixture.
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Tuesday, September 17th, 2013 AT 5:59 PM
Tiny
TY ANDERSON
  • MECHANIC
  • 684 POSTS
A few things to check. What are the short term fuel trims and long term fuel trim at idle and 1500RPM?
What is the throttle positioning sensor read at idle and 1500RPM.
At idle can you kill the engine just by cranking the steering wheel (vehicle not in motion)?
What happens when you turn on the a/c does the engine RPMs increase or does it cause the engine to stall.
I forgot to ask if the engine stalls when driving or at idle? Does the engine stall more frequently when it is cold or at operating temperature? Answer these questions and get back to me, TY
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Wednesday, September 18th, 2013 AT 6:50 PM
Tiny
CB8061
  • MEMBER
  • 5 POSTS
I'll have to get the scanner back from my brother. I forgot to tell you, I changed the temp sending unit. I'll get back to you.
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Wednesday, September 18th, 2013 AT 7:12 PM
Tiny
TY ANDERSON
  • MECHANIC
  • 684 POSTS
Ok let me know
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Tuesday, September 24th, 2013 AT 6:37 PM
Tiny
CB8061
  • MEMBER
  • 5 POSTS
Finally getting back to you. Fuel pump stopped working put new pump, pressure regulator and guage in, didn;t fix it. Ac doesn't effect idle, idles ok. Turning steering wheel doesn't effect idle. Sft fuel trim at idle 6 to 12 lft 0to 3 1500 rpm sft 0to11 lft 3to11. Tps v idle.77 1500.92 engine shakes at 1500, short plugs out, can't find one not firing. Unplug one coil pack, runs the same unplug other, runs same unplug maf senser runs same. Mechanic for 40 years never seen anything like this.
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Monday, September 30th, 2013 AT 3:57 PM
Tiny
TY ANDERSON
  • MECHANIC
  • 684 POSTS
Have you checked the throttle body for build up around the throttle plate. Build-up can cause a air restriction when the throttle plate closes causing the engine to stall. Clean the throttle body with a rag and appropriate intake clean designed for throttle bodies (the throttle plates are coated so brake clean for example will strip that coating off). Try this and get back to me.
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Monday, October 7th, 2013 AT 7:45 PM

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