Random drastic rpm drop at idle

Asked by Apr 19, 2018 at 05:58 PM about the 1998 Dodge Ram 1500

Question type: Maintenance & Repair

98 Dodge ram 1500 5.9.
Recently started having a pretty predictable idle drop to
almost a stall. Exhausted many replacement parts idle air
control throttle position sensor check vacuum leaks period to
no avail. Wonder if anybody else has had a similar problem
and can throw some advice at me I'm at my wit's end. When
is not acting up like the above said the truck runs great I've
only got a couple thousand miles left till 300,000 on the
engine.

4 Answers

Bump.... After I start it up the problem will start within 5-10 min of driving. I've figured out if I give it full throttle a time or two it will not act up again till I turn the engine off and start again.

Had the same problem with mine 98 ram make a long story short no check engine light so I had to take a guess at it. Coolant temp sensor helped but the fix for me was 02 sensor number one in front of the cat has ran great now for month and has not come back. Hope it helps

Kinda funny, I had actually went to the process of disconnecting the O2 sensors one at a time. Turned out the O2 sensor number one engine side of cat was either faulty or sending false signals to the truck. It's been disconnected now for a few months and not a problem since running great.

On a side note, I had just replace both O2 sensors and then that problem started happening.

Your Answer:

Ram 1500

Looking for a Used Ram 1500 in your area?

CarGurus has 400 nationwide Ram 1500 listings starting at $3,950.

Postal Code:

Dodge Ram 1500 Experts

  • #1
    Dan Connell
    Reputation
    8,990
  • #2
    dandyoun
    Reputation
    7,880
  • #3
    pudgybear
    Reputation
    7,500
View All

Related Models For Sale

Used Ford F-150
139 Great Deals out of 9,933 listings starting at $2,000
Used Chevrolet Silverado 1500
67 Great Deals out of 10,102 listings starting at $4,750
Used Dodge Ram 2500
4 Great Deals out of 87 listings starting at $5,900
Used GMC Sierra 1500
58 Great Deals out of 9,352 listings starting at $4,595
Used Toyota Tacoma
24 Great Deals out of 1,786 listings starting at $5,999
Used Ford F-250 Super Duty
10 Great Deals out of 751 listings starting at $5,995
Used Dodge Dakota
4 Great Deals out of 114 listings starting at $1,500
Used Ford Mustang
24 Great Deals out of 1,756 listings starting at $4,800

Used Cars for Sale

2010 Dodge Ram 1500 For Sale
6 Great Deals out of 114 listings starting at $8,950
2009 Dodge Ram 1500 For Sale
57 listings starting at $4,999
2008 Dodge Ram 1500 For Sale
78 listings starting at $3,950
2007 Dodge Ram 1500 For Sale
50 listings starting at $6,500

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.