96 Dodge Ram 1500 5.2 wont idle without peddle pushed at least at 50% until warmed up. once warmed up starts and runs perfect.

5

Asked by Jason Oct 03, 2018 at 07:55 AM about the 1996 Dodge RAM 1500 WS LB RWD

Question type: Maintenance & Repair

i have code p0171 and p1391 an o2 sensor and camshaft sensor i believe.
the o2 sensor is not used during cold start. after about 8 minutes of half
pedal i can idle it down and it will idle without any issues i can also turn the
engine off and it will start right back up fine for about 45 minutes after. if the
truck cools off long enough i have to hold the pedal down again but not
floored. just about 50% to keep it from stalling out. all the vacuum lines look
to be in good shape.

2 Answers
4,780

jetjurnigan answered 6 years ago

Has the throttle body been cleaned lately? How bout the idle air control valve? Look at the live data on your scanner. Fuel trims...long n short/ O2 sensors up n downstream/ intake air temp compared to outside air temp...and last but not least...what does the throttle position sensor say when moving the gas pedal?

Mark helpful
5

Jason answered 6 years ago

i will check voltage right after work. is it supposed to be 0.5v with no pedal pushed? and how much voltage wide open? i dont know if this helps but when warming it up i can gradually take my foot off the pedal as it gets closer to hot. i just cleaned the throttle body and iac but no help.

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