2001 Dodge Ram Follow-up

BORK

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

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 (above 1200 rpm+/-) will keep it running smoothly.

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

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

Thanks,
Rich

6 Replies

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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Monday, January 11th, 2010 AT 7:43 PM

BORK

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6 POSTS

Thank you for the reply. I installed a new IAC and took the truck for a drive. The same problem persisted and another showed up, all accompanied with new codes. P1391 was indicated after driving just 50ft or so. I'll run down the wiring to the crank & cam sensors, followed by a crank tooth inspection if possible. With 172K on the engine, I may opt for a lower mileage pullout (backed by a gurantee) and simply replace the whole thing if I'm going to spend more money on sensors. The fuel pump assembly had been replaced about 1200 miles ago.

The second, and likely separate problem that showed up for the first time during this drive is that the trans started slipping, accompanied by codes 1763 & 1762. From what I am able to determine, this issue can be correced by replacing the GPS & solenoid. Fluid levels are good and the fluid and filter had been changed out approx 1500 ago.

If I'm off track on my diagnosis and pathway to solutions, please let me know.

Thanks Much
Rich

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Monday, January 11th, 2010 AT 8:44 PM

BMRFIXIT

MECHANIC
19,053 POSTS

Connect scan tool to DLC. Using scan tool in MISCELLANEOUS FUNCTIONS, choose SET SYNC. The SET SYNC will indicate position of distributor for fuel synchronization, not the ignition timing, as ignition timing is controlled by PCM.
Follow instructions on scan tool and start engine. Warm engine to normal operating temperature and note display on scan tool with engine idling. If IN RANGE with zero degrees is displayed, let me know.
If a plus or minus number is displayed next to the degree number, distributor must be repositioned.
Loosen distributor clamp retaining bolt.
Rotate distributor until IN RANGE is displayed on scan tool. Continue rotating distributor until achieving as close to zero degrees as possible. Tighten distributor clamp bolt to 16 ft. Lbs. (22 N.M).

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Monday, January 11th, 2010 AT 8:57 PM

BORK

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6 POSTS

After warm-up, spark advance =0 deg. With some pedal. Jumps to 24 deg. At brief idle just before stalling.

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Thursday, January 14th, 2010 AT 8:40 AM

BORK

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6 POSTS

Oops - sorry I gave you what you didn't ask for. I don't have a MISCELLANEOUS FUNCTIONS and SET SYNC option. Would LT & ST fuel trim be the same? If so, the LT fuel trim is 2.5% steady, and ST fuel trim roams from 0% to -2% to +7.5% - all after warm-up. Hard to get a reading without any pedal due to the stalling.