1997 Mazda Truck 4.0L V6 - Intermittant high idle

1997 MAZDA TRUCK
90,000 MILES • 6 CYL • 2WD • MANUAL
Avatar
DARRYL_PAUL
  • MEMBER
  • 7 POSTS
Between 5 & 10 minutes in to my drive and intermitantly throughout I get a high idle of up to 3200RPM. I just changed the Throttle Position Sensor and ensures the throttle assembly and cable was not sticking but it did not fix the problem. What else could be the problem and how do I diagnose/fix it?
Mar 8, 2009 at 10:32 AM
Advertisement
Avatar
RACEFAN966
  • CERTIFIED EXPERT
  • 5,029 POSTS
Ok give me some more info on what it going on here. I need as much info as possible ok so I will ask some questions here so I can better help. What all have you done? Have you done a tune up if so what did you change have you done any other maintance like filter? Have you done any checkes on the IAC (idle air control) motor? Get back to me with what you can and we will go from there.
Mar 8, 2009 at 11:06 AM
Avatar
DARRYL_PAUL
  • MEMBER
  • 7 POSTS
tune up was done last year, this week I put on new air & fuel filters, PCV Valve, TPS, fuel system cleaning. Have not checked the IAC... how do I do this?
Mar 8, 2009 at 3:46 PM
Advertisement
Avatar
RACEFAN966
  • CERTIFIED EXPERT
  • 5,029 POSTS
Do you have a digital multi meter?
Mar 8, 2009 at 3:50 PM
Avatar
DARRYL_PAUL
  • MEMBER
  • 7 POSTS
yes I have a digital multimeter
Mar 8, 2009 at 3:54 PM
Avatar
RACEFAN966
  • CERTIFIED EXPERT
  • 5,029 POSTS
Ok then unplug the IAC motor and do an ohm's reading of the motor (not the wire harness plug). Get back to me with what you find.
Mar 8, 2009 at 3:59 PM
Avatar
DARRYL_PAUL
  • MEMBER
  • 7 POSTS
9.3 Ohms
Mar 14, 2009 at 10:24 AM
Avatar
RACEFAN966
  • CERTIFIED EXPERT
  • 5,029 POSTS
OK that is good not if you would test the coolant temp sensor (not the sender). Just simply unplug it and check resistance across it and give the temp at the time of the test. If you do this when it is cold then the air temp will be fine. Also have you cleaned the mass air flow meter? Get back to me and we will go to the next step.
Mar 14, 2009 at 7:36 PM