2003 Monte Carlo SS trouble idling, and temp

Asked by CJSCHS2019 Mar 11, 2021 at 01:34 AM about the 2003 Chevrolet Monte Carlo SS FWD

Question type: Maintenance & Repair

Just bought a 03 Monte Carlo from a friend of mine. We've been working on
it for a bit before he sold it to me, and it still has two main problems that are
baffling us. He replaced MAP sensor, TPS sensor, thermostat, IAC valve,
and other things. It's main problem is the temperature, and a constant high
idle. Sometimes, it will idle like normal then slowly begin to go higher and
higher till around 2,000 rpms. While having this high idle, it causes the car to
accelerate when in gear. The temperature is also something that is odd.
Heater core, and radiator have been flushed, and thermostat change, but it
seems like it still tends to get very hot. Any suggestions?

2 Answers
27,570

oilyspill answered 3 years ago

Did you get a trouble code relating to any sensors you replaced? You should be able to check sensor signal and compare to idle spec for that sensor. I always try to check component wiring circuits before replacing. With high idle, in your drive-way, transmission in park, block off the mouth of throttle body, should kill the engine. If very little or no effect on idle, you got false air getting in there from somewhere? when problem is ongoing, your cruise control isn't engaging? Did you clean throttle bore and around throttle plate?

Mark helpful

Your Answer:

Related Questions

Shortcuts

Search Chevrolet Monte Carlo Questions

CarGurus Experts

  • #1
    James Sparrow
    Reputation
    1,050
  • #2
    tenspeed
    Reputation
    990
  • #3
    John Saffrahn
    Reputation
    720
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Impala
10 Great Deals out of 110 listings starting at $4,632
Used Chevrolet Camaro
16 Great Deals out of 307 listings starting at $9,995
Used Chevrolet Corvette
28 Great Deals out of 1,058 listings starting at $15,871
Used Chevrolet Tahoe
20 Great Deals out of 904 listings starting at $11,900
Used Chevrolet Silverado 1500
195 Great Deals out of 5,967 listings starting at $2,975
Used Buick Regal
5 Great Deals out of 35 listings starting at $5,600
Used Cadillac Escalade
21 Great Deals out of 379 listings starting at $6,900
Used Ford Mustang
65 Great Deals out of 1,258 listings starting at $4,995
Used Chevrolet Malibu
54 Great Deals out of 1,151 listings starting at $1,295
Used Jeep Grand Cherokee
122 Great Deals out of 3,221 listings starting at $4,995

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.