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
27,580

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

Own this car?

Share your experience with others.

2003 Chevrolet Monte Carlo

Write a car review

Review another car

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

Know more, shop wisely

Search

Related Models For Sale

Used Chevrolet Impala
243 Great Deals out of 3,876 listings starting at $1,500
Used Chevrolet Camaro
626 Great Deals out of 8,407 listings starting at $3,240
Used Chevrolet Corvette
777 Great Deals out of 14,535 listings starting at $4,999
Used Chevrolet Tahoe
1,388 Great Deals out of 34,821 listings starting at $1,550
Used Ford Mustang
964 Great Deals out of 19,910 listings starting at $1,950
Used Chevrolet Silverado 1500
4,227 Great Deals out of 123,650 listings starting at $1,999
Used Buick Regal
52 Great Deals out of 710 listings starting at $1,984
Used Chevrolet Malibu
1,048 Great Deals out of 24,447 listings starting at $1,500
Used Ford F-150
6,456 Great Deals out of 172,211 listings starting at $1,999
Used Pontiac Firebird
7 Great Deals out of 365 listings starting at $6,991
Used Cadillac Escalade
389 Great Deals out of 8,294 listings starting at $2,500

Used Cars For Sale

2007 Chevrolet Monte Carlo SS FWD For Sale
9 listings starting at $5,500
2006 Chevrolet Monte Carlo SS FWD For Sale
8 listings
2004 Chevrolet Monte Carlo SS FWD For Sale
4 listings
2003 Chevrolet Monte Carlo SS FWD For Sale
11 listings

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.