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1990 Ford Ranger rough idle

Tiny
JAMESKP
  • MEMBER
  • 1990 FORD RANGER
  • 4 CYL
  • 2WD
  • MANUAL
  • 129,222 MILES
Ok it has a rough idle but it runs good up until about 4000 rpms then wants to stall out, then revs up a little bit the stalls back down wut could it be? Please help
Tuesday, November 25th, 2008 AT 7:49 PM

8 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the idle speed control solenoid, throttle position and BMAP sensors. Also do a fuel pressure test
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Tuesday, November 25th, 2008 AT 8:15 PM
Tiny
JAMESKP
  • MEMBER
  • 6 POSTS
I switched all of the emmission control sensor, crank position sensor, changed the MAF three or four times, changed the MAP, change the pintle egr valve postion sensor, the idle air solenoid, TPS, fuel pressure is 35 to 40 idling. Ne thing else u can think of ne thing would help. Thanks for ur time
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Tuesday, January 6th, 2009 AT 9:54 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hook the fuel pressure gauge back up and monitor the fuel pressure at higher RPM
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Tuesday, January 6th, 2009 AT 3:40 PM
Tiny
JAMESKP
  • MEMBER
  • 6 POSTS
Oo ok I will, wut is it supposed to be at, at higher rpms?
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Tuesday, January 6th, 2009 AT 4:17 PM
Tiny
RASMATAZ
  • MECHANIC
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Try 2500 rpm should increase 8-10psi
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Tuesday, January 6th, 2009 AT 4:22 PM
Tiny
JAMESKP
  • MEMBER
  • 6 POSTS
Oo ok I will try it if does increase wut else could it be
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Tuesday, January 6th, 2009 AT 4:47 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If it doesn't increase there's a problem with the pressure regulator could be leaking or its not getting vacuum to it/leaking
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Tuesday, January 6th, 2009 AT 4:50 PM
Tiny
JAMESKP
  • MEMBER
  • 6 POSTS
Oo ok will do
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Thursday, January 8th, 2009 AT 8:52 AM

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