6th Gen ('00-'05): Degraded power
#1
Degraded power
2003 Monte Carlo SS (N/A): I just turned 160,000 with the original engine and trans. I bought the car with 105,000. The day I bought the car, it hit the governor no problem (126MPH, closed track ). As of today, it seems a bit sluggish, and doesn't want to even look at 126 on the same "track". Are there some tips for getting some lost horses back? Here's the maintenance since I bought the car:
There might be some more I'm missing, but any input would be great!
- Oil change every 3,500-4,000 (conventional 5W-30, Wix Performance filter)
- Spark plugs and wires at 135,000
- Air filter at 145,000
- Injector cleaner every other oil change
- Ethanol-free 91 round the clock
- New Magnaflow catalytic converter at 140,000 (no MIL)
There might be some more I'm missing, but any input would be great!
#2
Join Date: Apr 2010
Location: Mentor, Ohio
Posts: 12,175
There's a lot of things that play into a car with age, mileage and performance. Take a look at the thread below, it may give you some food for thought on additional maintenance items:
https://montecarloforum.com/forum/fw...0-miles-46078/
https://montecarloforum.com/forum/fw...0-miles-46078/
#3
bad cat or maf cleaning?
hey I am having issue with bad mpg,booged down sound, no acceleration, passing gear wont go,cleaned k&n cai,added seafoam to gas? going to clean MAF sensor today any other clues? Bad cat?? thanks
#4
Ok cleaned MAF sensor,no fix! engine runs and revs smooth,just bogs down in second,third,step on it and passing gear,engine revs up but does not jump into lower gear? otherwise shifts ok, a little iffy,gas mileage is poor!! Uggghh!!
#6
Black sheep, Claydoh here! I have not replaced my cat,90k on car,I think the other poster, dc1 had his cat changed, are my sympyoms typical of a bad/clogged cat? it doesn't seem to be red hot glowing? I also read somewhere that a bad MAP sensor could cause my problems?? thank you!!
#9
The PCV is located on the passenger side of the UIM.