1998 Ford Ranger Persistant Problem

Tiny
JURY_CURL
  • MEMBER
  • 1998 FORD RANGER
  • 4 CYL
  • 2WD
  • MANUAL
  • 179,863 MILES
Ok so I have this truck 98 Ford Ranger 4cyl 2.5L. Idles rough. After you start it it idles really low like its going to die. After I pump the gas it revs up to about 1500 - 2500 rpms. Stays there and slow creeps to about 800 rpms. When I first take off it putts and trys to die mostly in reverse not so much when in 1st. When I slow down to come to a stop and pop into Nutural it revs up to like 2500 - 3000 rpms and stays there till I put it in gear. It also lacks power and has a low fuel pressure level. Ive changed fuel filter, TPS, Emissions Control Sensor, spark plugs, spark plug wires, and air filter, and fixed all vacum leaks. But still has problem. I need help damn thing is draining my pocket ha.
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Saturday, September 5th, 2009 AT 2:03 PM

9 Replies

Tiny
MERLIN2021
  • EXPERT
Two things to check are IAC(idle air control) and the ECT(engine coolant temp) sensor.
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Saturday, September 5th, 2009 AT 2:58 PM
Tiny
JURY_CURL
  • MEMBER
Ok so I changed idle air control (IAC) and it still has the same problem man. Where is the engine coolant temp sensor at?
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Sunday, September 6th, 2009 AT 4:19 PM
Tiny
MERLIN2021
  • EXPERT
B$ we change any more parts, lets figure out whats happening, OK? Isd your check engine light on? If yes go to Autozone, they read the codes for free, post ALL codes found, they will give you a printout of the codes if you ask. I need the exact codes! They will be numbers proceeded by the letter "P", such as P0171 and so forth. VERY impotant, also tell me abouty ALL recnt work and ANY aftermarket installations, radio, security sytems, radar detectors.
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Sunday, September 6th, 2009 AT 9:18 PM
Tiny
JURY_CURL
  • MEMBER
Yeah the check engine light is on. Sorry dont live close to an autozone so it took awhile to get codes. But here it is P1506, P0453, P0171.
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Monday, September 21st, 2009 AT 11:52 AM
Tiny
MERLIN2021
  • EXPERT


http://www.2carpros.com/forum/automotive_pictures/62217_171_1.jpg



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I will check into it later today.
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Tuesday, September 22nd, 2009 AT 2:32 AM
Tiny
MERLIN2021
  • EXPERT
Air leaks(vacuum) is the probable cause! Use a can of spray TBI cleaner and spray around, when you find a leak the engine idle will change. 20) DTC P1506 This DTC indicates IAC system has reached over speed malfunction. Possible causes are: IAC circuit short to ground. IAC assembly stuck open. Air intake leaks or restrictions. Damaged throttle body. Contaminated or damaged IAC valve assembly. Faulty Powertrain Control Module (PCM). Start engine and allow to idle. Inspect air inlet system any of the following possible faults: Cracked or punctured air inlet tube. Loose inlet air tube or air cleaner housing. Loose or damaged throttle body. Contaminated or damaged IAC valve assembly. Faulty EGR valve or gasket. Faulty PCV valve or hose. Check entire system for vacuum leaks. Repair as necessary. If no vacuum leaks are found, go to next step. 21) Check EVAP System Turn ignition off. Disconnect hoses from EVAP canister purge valve. Connect a vacuum pump to carbon canister hose port. See Fig. 53 . Using vacuum pump, apply 16 in. Hg to port. If vacuum bleeds off within 20 seconds, replace EVAP canister purge valve. If vacuum holds, go to next step. Fig. 53: Identifying EVAP Canister Purge Hose Ports 22) Check IAC Valve Function Start engine and allow to idle. Ensure transmission is in Park or Neutral and engine is warmed to normal operating temperature. Disconnect IAC valve wiring harness connector. If engine speed drops, go to next step. If engine speed does not drop, check throttle body for damage. If throttle body is okay, replace IAC valve. 23) Check IAC Circuit For Short To Ground Turn ignition off. Disconnect scan tool from DLC. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 83 (IAC) and test pins No. 51 and 103 (PWR GND) at breakout box. If both resistance readings are more than 10,000 ohms and idle speed is normal, go to step 30). If both resistance readings are more than 10,000 ohms and high idle speed is present, replace PCM. If resistance is 10,000 ohms or less, repair short to ground in IAC circuit.
9/22/2009 ...


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33) DTC P0453: Check FTP Sensor Voltage Turn ignition on. Using scan tool, select FTP V PID. If PID voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, fault is intermittent. Go to step 42). 34) Check For Short To Power Turn ignition off. Disconnect FTP sensor connector, located on top of fuel tank. Turn ignition on. Measure voltage between FTP terminal at FTP sensor wiring harness connector and negative battery terminal. If voltage is 10.5 volts or less, go to step 36). If voltage is more than 10.5 volts, go to next step. 35) Check FTP Circuit For Short To VPWR Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Turn ignition on. Measure voltage between test pins No. 62 and 103 at breakout box. If voltage is more than 10.5 volts, repair short circuit. If voltage is 10.5 volts or less, replace PCM. 36) Check Opposite Induced Low FTP Signal Turn ignition off. Connect a jumper wire between SIG RTN and FTP terminals at FTP sensor wiring harness connector. Turn ignition on. If scan tool communication link error is displayed, remove jumper wire and go to step 41). Using scan tool, select FTP V PID. If PID voltage is less than .1 volt, remove jumper wire and go to next step. If PID voltage is .1 volt or more, unable to induce opposite signal. Go to step 39). 37) Check Voltage At FTP Sensor Connector Measure voltage between VREF and SIG RTN terminals at FTP sensor wiring harness connector. If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, VREF voltage is out of range. Go to CIRCUIT TEST C . 38) Check For Short Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pins No. 62 and 90 at breakout box. If resistance is more than 10,000 ohms, replace FTP sensor. If resistance is 10,000 ohms or less, repair FTP circuit short to VREF circuit. 39) Check For Open FTP Circuit Turn ignition off. Disconnect PCM 104-pin connector. Inspect connector for loose, damaged or corroded terminals. Install Breakout Box (014-00950), leaving PCM disconnected. Measure resistance between test pin No. 62 at breakout box and FTP terminal at FTP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in FTP circuit. 40) Check For Open SIG RTN Circuit Measure resistance between test pin No. 91 at breakout box and SIG RTN terminal at FTP sensor wiring harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in SIG RTN circuit. 41) Check FTP Circuit For Short To VREF Circuit Measure resistance between test pins No. 62 and 90 at breakout box. If resistance is more than 10,000 ohms, replace PCM. If resistance is 10,000 ohms or less, repair FTP circuit short to VREF circuit. 42) Check For Intermittent Open Or Short To Power Turn ignition on. Using scan tool, select FTP V PID. Observe FTP V PID for indication of fault while shaking and bending FTP sensor wiring harness and connector. A fault will be indicated by a sudden change in FTP V PID voltage. Tap lightly on sides of FTP sensor to simulate road shock. DO NOT tap on top of sensor. If fault is indicated, isolate fault and repair as necessary. If no fault is indicated, go to CIRCUIT TEST Z . NOTE: A break in step numbering sequence occurs at this point. Procedure skips from step 42) to step 44). No test procedures have been omitted.


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Tuesday, September 22nd, 2009 AT 4:16 PM
Tiny
JURY_CURL
  • MEMBER
Thanks for the info. Its runnin better now so my inlaw took it back I gota ford explorer now but I got a pronlem with that now. Can u help me out. Its a 2003 Ford Explorer XLT it has a V8 motor and its a 4x4. I let my inlaw borrow the car and now the 4x4 Low and 4x4 High do not work not even the 4x4 Auto works. On the buttons the 4x4 low button is lit but is dim. And on my gages two lights flash simotaniously the 4x4 High and the 4x4 Low. They flash breifly for about a min then turn off for roughly 10 - 20 min then they flash for a min, its a continuse thing. I dont know what goin on with it and if you got any information about it that would be awsome. Thanks bud =)
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Monday, October 19th, 2009 AT 3:06 AM
Tiny
MERLIN2021
  • EXPERT
On the transfer case locate the small electric motor, it looks a lot like a wiper motor, tap it with a hammer while a friend pushes the button, it may be a typical Ford actutor motor, contacts rust/corroded, may also need to be replaced.
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Tuesday, October 20th, 2009 AT 2:48 PM
Tiny
JURY_CURL
  • MEMBER
Kool man thanks ill try that out and tell you how it goes =)
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Tuesday, October 20th, 2009 AT 8:33 PM

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