2001 Dodge Ram 2001 Dodge Ram Runs Rough - Stalls

BORK

MEMBER
2001 DODGE RAM
V8
2WD
AUTOMATIC
172,000 MILES

2001 Dodge Ram 1500
5.9L
172,000 mi.
2WD

Runs Rough, stalls, & misfires up to 3,000 rpm. Starts & runs fine when cold – symptoms show-up after a brief warm-up.

Original symptoms were stalling at idle or near idle when slowing down during driving (again ran fine when cold). There was some misfiring or “bucking" during driving, but was minimal and started just before changing the battery. In addition the symptoms would go away after driving for 30+ minutes. No codes were displayed. I changed the battery out (old one tested bad). After installing the battery, the engine ran rough with misfires after warm-up (was fine cold), and eventually would stall. Everything smoothes out just above 3,000 rpm & codes 0171, 0500 & 1391 are displayed.

I’ve owned the truck for a few years and have only put about 2000 – 3000 miles on it, but never had any real issues before now. Frequency of driving is about 2 – 3 times per month and long enough for everything to get well warmed up.

The TB was cleaned out well just after I purchased the truck.

Before embarking on a replacement campaign for IAC, Crank & Cam sensors, & differential speed sensor among other things, do you have a more targeted idea as to what I should start on?

Thanks

UPDATED 1/9/10
Thanks for the reply.

Fuses all good, harness (as much as I could inspect) looks ok, no vacuum line or fitting leaks, but found the air intake box was not set correctly.
Re-set this and truck runs fine except warm idle. Idles fine cold, but as soon as RPMs drop upon warm-up it stalls. Some accelerator will keep it running smoothly.

I cleared the codes and no new ones are indicated after keeping the truck running for a bit.

Would this narrow it down to the IAC? Reminder - new battery was just installed.

Thanks,
Rich

4 Replies

BMRFIXIT

MECHANIC
19,053 POSTS

Before replacing parts a basic list of things should be checked
check fuses
check wiring harness
check for vacuum leaks
and after all check OK
codes need to be resolved
this is what I have for descriptions on each code you listed

code P1391Description
Camshaft Position (CMP) sensor and Crankshaft Position (CKP) sensor signals are monitored with engine cranking or running. DTC will be stored in Powertrain Control Module (PCM) memory when failure counter reaches 20 for 2 consecutive trips.

Possible causes for DTC to set are: defective CMP sensor, defective CKP sensor, defective crankshaft notches, defective target magnet, or defective connectors or wiring.

Code p0500 Description
Vehicle Speed Sensor (VSS) signal is monitored when engine is running, transmission is in gear and output shaft speed is more than 64 RPM, engine coolant temperature is more than 104 °F (40 °C), MAP sensor vacuum is 15-16 in. Hg. And engine speed is more than 1500 RPM. DTC will be stored in Powertrain Control Module (PCM) memory when PCM senses no vehicle speed signal from Controller Anti-Lock Brake (CAB) module for more than 15 seconds for 2 consecutive trips.

Possible causes for DTC to set are: CAB module DTCs exist, defective CAB module, defective PCM, or defective connectors or wiring.

P0171 Description
Fuel system lean condition is monitored when engine is running in closed loop, ambient temperature is more than 20 °F (-7 °C), battery temperature is more than 20 °F (-7 °C) and altitude is less than 8000 feet. DTC will be stored in Powertrain Control Module (PCM) memory if PCM multiplies short term compensation by long term adaptive and a certain percentage is exceeded for 2 trips.

Possible causes for DTC to set are: defective fuel pump module, defective Throttle Position (TP) sensor, restricted fuel inlet strainer on fuel pump, defective Engine Coolant Temperature (ECT) sensor, defective Manifold Absolute Pressure (MAP) sensor, engine mechanical problem, defective Heated Oxygen Sensor (HO2S), defective fuel filter or defective fuel pressure regulator.

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Wednesday, January 6th, 2010 AT 6:13 AM

BMRFIXIT

MECHANIC
19,053 POSTS

If holding the paddle down would keep it running
I would suspect IAC valve
but since the battery was replaced
this is what I would start with
disconnect battery
clean throttle body and IAC
reconnect battery start engine and let it idle
and then take it for a spin

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Friday, January 8th, 2010 AT 4:23 PM

IMGTX

MEMBER
1 POST

Dodge Rams with the Magnum Engines have a problem with the pan on the underside of the intake leaking. With the engine off, open the throttle body all the way and look into the intake with a flashlight. If you see oil puddling in the bottom it is probably leaking. Small leaks can cause low speed & idle problems as well as oil consumption. It can show itself when only warmed up or all the time.

If you find that to be the problem don't just replace the gasket. Replace the pan with a 1/4" thick plate of aluminum. The factory sheetmetal plate will eventually warp, if you use a thick steel plate it may cause cracks in the aluminum manifold do to different coefficients of expansion. 1/4" aluminum plate works great. I have made them with a jig saw and drill, or you can laser cut them cheap or even buy them premade.

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Sunday, January 24th, 2010 AT 2:57 PM

BORK