Question about Dodge Ram 2500

2 Answers

The Ingine has not power after 2500 RPM's.

I have a 1997 Dodge 2500, 5.9L (360ci). I've Checked the TPS, MAP, the Idle control module. I've checked Fuel pressure, both at an idle & taped the gauge to the windshield to see what it was doing going down the road. Fuel Pressure and regulator appear to be good. I've checked the Cad. converter, it too appears to be good. I've replaced the Plugs, wires, cap & rotor, still to no avail. Not sure what else to check? I do not know how to reset the computer, but not sure that's what needs to be done.

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  • Dodge Master
  • 4,521 Answers

Try unplugn it for a few may clear up--older cars get stale--it may need to be replaced cause the injector drivers are worn--but reflashn it may renew it-------a gud mech w the equip for that model can do it--a data stream run is important also--a store code reader doesnt show evrything--

Posted on Dec 27, 2013

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I'm pretty sure it sounds like the seal under you fuel pump is bad I had a buddy whose truck was doing the same thing and we just replaced the fuel pump which came with a new seal and the fixed it I guess with the fuel pump seal bad it was letting air in and screwe everything up

Posted on Dec 26, 2013

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Correct fuel pressure on the 5.7 in my 1999 gmc 3500 van?

Check the TPS. If you code the ECU there might be a P121 stored in the OBD2 port. If tere is no code the a cloged converter will be your best bet.

Posted on Apr 28, 2010

  • 1 Answer

SOURCE: 1994 gmc seirra k1500 4.3 engine 4x4 hesitation

Possible erratic signal from the crank sensor

Posted on Jul 31, 2010

saailer
  • 1868 Answers

SOURCE: loss of power and a slight skip through driving

Hello! Although the Throttle Positioning Sensor (TPS) has been changed the symptoms are pointing at it...When the new one was installed was it mounted with the throttle valve held shut; Then rotated counterclockwise until the mounting holes lined up? Send a comment...Guru..saailer

Posted on Dec 19, 2010

  • 147 Answers

SOURCE: replaced mass air flow sensor, fuel filter, air

check timing make sure it;s ok . second check your exhaust system if it;s close , start accilerate for 3 min. then look all exhaust pipe (silencer) if there is difrent coler . check Oxgen sensor it;s ok .
and if you have no enough fuel presure try close the return line temporary . maf, sensor only when there it is highand low accilerator.

Posted on Jun 23, 2011

caroldon
  • 17129 Answers

SOURCE: idles irratic and runs rough down road after warmed up

Rough on idle when the engine is warm means there are many areas to be checked and it can start with the ECM , the fuel pump and more likely the sensors, check the throttle valve, the camsensor which can be set off which might need a correction. Also the vacuum feed for auto advance needs to checked.

Posted on Nov 15, 2011

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P0121 and p0068 on a 2003 dodge ram 1500 replace the throttle position sensor and the idle air sensor at the same time then ran for a week with no problems then the truck started idling up at random then...


P0121 The Throttle position sensor is a potentiometer that measures the amount of throttle opening. As the throttle is opened, the reading (measured in volts) goes up. The powertrain control module (PCM) supplies a 5 Volt reference signal to the throttle position sensor (TPS) and usually a ground also. A general measurement is: at idle = .5 Volts; full throttle = 4.5 Volts. If the PCM detects that the throttle angle is greater or less than it should be for a specific RPM, it will set this code.
Potential Symptoms Symptoms of a P0121 trouble code could include:
  • Malfunction Indicator Lamp (MIL) illumination (Check Engine Light or Service Engine Soon light)
  • Intermittent stumble on acceleration or deceleration
  • Blows black smoke on acceleration
  • No start
Causes A code P0121 may mean that one or more of the following has happened:
  • TPS has intermittent open or short internally
  • Harness is rubbing and causing an open or short in the wiring
  • Bad connection at the TPS
  • Bad PCM (less likely)
  • Water or corrosion in connector or sensor
Possible Solutions 1. If you have access to a scan tool, see what the idle and WOT (wide open throttle) readings are for the TPS. Check if they're close to the specifications mentioned above. If not, then replace the TPS and re-check.

2. Check for an intermittent open or short in the TPS signal. To do that, you can't use a scan tool. You'll need an oscilloscope. The reason is because scan tools take samplings of many different readings over just one or two data lines and can miss an intermittent drop out. Hook up your oscilloscope and watch the signal. It should sweep up and down smoothly with no drop outs or spikes.

3. If no problems were noticed, perform a wiggle test. Do this by wiggling the connector and harness while watching the pattern. Does it drop out? If so, replace TPS and re-check.

4. If you have no TPS signal, check for 5 Volt reference at the connector. If it's present, check the ground circuit for open or shorts.

5. Make sure the signal circuit isn't 12V. It should never have battery voltage. If it does, trace circuit for short to voltage and repair.

6. Look for any water in the connector and replace TPS as necessary.
P0068 Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/Loss of power
- Engine rough idle Possible causes - Large vacuum leak
- Leaking air duct system
- Mass Air Flow (MAF) poor electrcial connection
- Manifold Absolute Pressure (MAP) poor electrcial connection
- Faulty Mass Air Flow (MAF) sensor
- Faulty Manifold Absolute Pressure (MAP) sensor
- TP sensor not seated properly.
- Faulty Throttle Position (TP) sensor.
- Dirty throttle body
When is the code detected? The Powertrain Control Module (PCM) monitors operation rationality check by comparing sensed throttle position to mass air flow readings
P0068 DODGE Description The Powertrain Control Module (PCM) monitors a vehicle operation rationality check by comparing Throttle Position (TP) to Mass Air Flow (MAF) readings. If, during a self-test, the comparison of the TP sensor and MAF sensor readings are not consistent with the calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.

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My 1997 Chrysler Concord idles at 2500 to 3000 rpm when first started and when it warms a little it idles at 2000 rpm and stays there. When I start it right after I turn it off, it starts at 2500 rpm then...


Maybe a short to the TPS or something shorting it out. There's also the IAC that really controls the idle but usually it will cause the RPM's to go up and down a little erratic if bad. The MAF sensor can cause major problems as well but since you already swapped the TPS and it helped and then stopped I would focus on that sensor and especially it's wiring to and from the ECM. Be careful with the sensor signal wire to the ECM can blow it if more than 5v passes or spikes.

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1 Answer

2500 to 3000 rpm idle


Change your Thottle positioning Sensor. My 93 lesabre did the same thing and i changed the TPS and it stopped.

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