Fast idle after warm up

Asked by GuruWPYTL May 18, 2018 at 07:33 PM about the 2003 Dodge RAM 1500 SLT Quad Cab LB RWD

Question type: Maintenance & Repair

4.7 after a couple minutes warm up it idles up from 1000 to 1500 rpm. I
changed TPS and it made no difference. I was told maybe a vac leek but it
idles fine until it warms up. Help !!

3 Answers
4,640

jetjurnigan answered 5 years ago

Your ECM runs in a default mixture mode till the O2 sensors get warm enough. Then they take over. It's possible one of them are bad...but that's a big guess. Do you have access to or can you get your hands on an engine scanner that reads live data? You can get 1 for around $30-50...shop around. You'll find it's one of your best investments if you intend to do any work yourself. Once you've got one, you're looking for long n shjort term fuel trims, O2 sensor reads, intake air temp vs. ambient and coolant temp.

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • Fast idle after warm up 3 Answers

    4.7 after a couple minutes warm up it idles up from 1000 to 1500 rpm. I changed TPS and it made no difference. I was told maybe a vac leek but it idles fine until it warms up. Help !!

    2003 Dodge RAM 1500 SLT Quad Cab LB RWD

    -

    Maintenance & Repair

  • Starting after warm up 1 Answer

    Starts finest first start but after driving it won’t start till it cools down(especially in hot weather) been doing this for 2 yrs!????

    1998 Dodge RAM 1500 ST Quad Cab LB 4WD

    -

    Maintenance & Repair

  • clicking/grinding noise from rear when turning after warm up 1 Answer

    I pretty much said it all in the title. After driving about 30-45 miles truck makes a clicking/grinding noise that can be felt when turning and backing up. Sounds like it is coming from the rear.

    1998 Dodge RAM 1500 ST Club Cab LB RWD

    -

    Maintenance & Repair

  • overdrive turns off after 10 minutes warm up any ideas? 3 Answers

    After 10 minutes of driving with overdrive working perfectly it automatically shuts off and then the transmission to hot light comes on and no longer goes into overdrive but has no other problems....

    1998 Dodge RAM 1500 ST 4WD

    -

    Maintenance & Repair

  • Truck shuts off after engine is warm! 4 Answers

    I put a 2000 jeep Grand Cherokee 4.7 engine on my 02 dodge ram 1500 ... " Used a 02 Durango intake Manifold because It was new off my old Engine " Now after installing engine, my truck will start u...

    2002 Dodge RAM 1500 SLT Plus Quad Cab 4WD

    -

    Maintenance & Repair

RAM 1500

Looking for a Used RAM 1500 in your area?

CarGurus has 86 nationwide RAM 1500 listings starting at $2,000.

Postal Code:

Shortcuts

Search Dodge RAM 1500 Questions

CarGurus Experts

  • #1
    Dan Connell
    Reputation
    19,910
  • #2
    dandyoun
    Reputation
    15,170
  • #3
    Gene Arnett
    Reputation
    11,710
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
294 Great Deals out of 14,028 listings starting at $3,888
Used Chevrolet Silverado 1500
170 Great Deals out of 7,303 listings starting at $6,495
Used GMC Sierra 1500
155 Great Deals out of 8,158 listings starting at $5,500
Used Dodge RAM 2500
3 Great Deals out of 31 listings starting at $7,900
Used Toyota Tundra
41 Great Deals out of 948 listings starting at $10,698
Used Toyota Tacoma
45 Great Deals out of 862 listings starting at $9,975
Used Chevrolet Silverado 2500HD
33 Great Deals out of 1,560 listings starting at $5,990
Used Dodge Durango
58 Great Deals out of 1,850 listings starting at $9,998
Used Jeep Grand Cherokee
123 Great Deals out of 3,826 listings starting at $3,922
Used Ford F-250 Super Duty
24 Great Deals out of 856 listings starting at $9,995
Used Ford Mustang
49 Great Deals out of 1,643 listings starting at $5,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.