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over full or wrong oil filter
Not if the Monte originally had a 3.4. The computer, wiring harness and many of the sensors are engine specific.
I doubt it as they changed the body style in 2000.
The Chevy supercharged 3.8 liter engine will fit into the Chevrolet Monte Carlo. The wiring harness will need to be changed.
Although it was a long time ago, we took the dash from a '70 Monte Carlo and just installed it in my '70 Elc. The Monte wiring harness just pluged right in.
wiring
Remove the wiring harness from the back of your 1999 Chevy Monte Carlo blower motor. Remove the blower motor retaining bolts. Remove the fan on the front of the blower motor. Reverse the process to install the new blower motor.
Begin by removing the retaining ring at the top of your 2001 Chevrolet Monte Carlo ignition switch. The ignition switch barrel will slide out. Remove the wiring harness from the end of the ignition switch. Reverse the process to install your new ignition switch.
Begin by removing the radio retaining cover. Remove the radio retaining screws. Slide the radio out. Remove the wiring harness and the antenna cable from the back of the radio.
A base audio system wiring diagram can be seen on page 12-31 of the Haynes Repair Manual #24047 for the Impala 2006 thru 2008 and Monte Carlo 2006 and 2007.....
You can remove the ignition switch, on your 1981, Monte Carlo, by removing the retaining clip. With the retaining clip removed, whole the switch out and remove the wiring.
the wiring is probally defected or the light is burned out