DO ECM LOOSE CALIBRATION OR RESET REV LIMIT PARAMATORS?

Asked by Nov 20, 2011 at 01:43 PM about the 2003 Chevrolet Monte Carlo

Question type: Maintenance & Repair

2003 CHEVY MONTE-CARLO SS 3.8 V6 ENG CODE K.  CAR STUMBLES AND MISFIRES AT 4,000 RPM UNDER HEAVY ACCELERATION. ONCE PAST 4 GRAND ENG SEEMS TO RUN FINE. ENG RUNS FINE UNDER ACCELERATED LOAD UP 4 GRAND AS WELL

3 Answers

2,725

You said it runs fine past 4,000 rpms...at what point past? Like, does it break up in a specific rpm range, say 4000-4500 and clear up after that? To answer your question...No, the rev limiter is a function hard-programmed into the engine computer and will not lose memory. What *can* lose memory is fuel trim tables primarily, along with IAC position and some other things aside from the more obvious interior items like radio, power accessories.... The fuel trims will take a little bit of driving to get back to normal and some vehicles are more sensitive to losing these tables than others. Any Check Engine lights or stored codes?

ENG SEEMS TO RESPOND NOMINALY AFTER IT PASSES 4500 RPM. WHEN THE ENG WAS MISFIREING BADLY THE "CHECK ENG LIGHT" JUST FLASHED REPEATEDLY BUT RARELY SET STEADY ON. WHEN I DID GET THE SES LIGHT TO SET ALL THE CODE WAS P0300 "MULTIPLE MISFIRES" LATELY I HAVE RUN A TANK AND 1/2 OF 93 OCT GAS AND ADDED BOTTLES OF "HEAT" TO THE FUEL THINKING I HAVE PICKED UP SOME WATER OR BAG GAS

2,725

RPM specific, especially with that tight of a window, is pretty odd.... See if you can find someone that will datalog it for you. But as of right now, with you symptoms, I'm leaning towards possibly a faulty mass air meter, though this is a bit strange even for that. Try unplugging the meter. I know it will throw a code, but it will make the car go into a "limp mode" and it will run off of pre-calibrated fueling tables. It will be rich and be down on power, but if the MAF is the culprit, your miss from 4k to 4.5k will disappear. Update us after you try. If this doesn't work, plug it back in and have Autozone or someone clear the code for you so if you're able to get it datalogged, the technician isn't chasing a bogus code. And obviously always plug and unplug it with the engine off and key out.

1 of 1 people found this helpful.

Your Answer

Monte Carlo

Looking for a Used Monte Carlo in your area?

CarGurus has 1,279 nationwide Monte Carlo listings starting at $1,488.

ZIP:

Chevrolet Monte Carlo Experts

  • #1
    Tom Demyan
    Reputation
    520
  • #2
    Js08016
    Reputation
    510
  • #3
    John Saffrahn
    Reputation
    440
View All

Related Models For Sale

Used Chevrolet Impala
536 Great Deals out of 35,319 listings starting at $900
Used Chevrolet Camaro
450 Great Deals out of 30,875 listings starting at $2,495
Used Ford Mustang
592 Great Deals out of 36,395 listings starting at $1,200
Used Pontiac Grand Prix
28 Great Deals out of 2,639 listings starting at $1,449
Used Chevrolet Malibu
979 Great Deals out of 66,083 listings starting at $1,000
Used Chevrolet Corvette
178 Great Deals out of 19,856 listings starting at $2,490
Used Buick Regal
177 Great Deals out of 8,872 listings starting at $4,800
Used Chevrolet Silverado 1500
2,293 Great Deals out of 169,798 listings starting at $1,000
Used Chevrolet Tahoe
742 Great Deals out of 41,783 listings starting at $1,995
Used Pontiac Firebird
3 Great Deals out of 769 listings starting at $2,500

Used Cars For Sale

2007 Chevrolet Monte Carlo For Sale
112 listings starting at $6,868
2006 Chevrolet Monte Carlo For Sale
198 listings starting at $2,500
2005 Chevrolet Monte Carlo For Sale
125 listings starting at $1,488

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.