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Car Forum / Chevrolet / Chevrolet Malibu / December 2004Transmission problems
Hello, I have a 99 Monte Carlo with about 140k miles on it. A few months ago I had the transmission fluid replaced and it started doing weird things a few weeks later. I've checked the level when it's hot and the car is running and I don't see a problem. Sometimes after I've been on the highway for a little while and then I get off, when the transmission is shifting through the gears, it slams into each gear instead of the nice smooth shift it always has. I've tried using just the regular D, the D with the square around it, I've put the car in park and neutrual then back to drive. I've also shut the car off and back on. the ONLY thing that seems to stop the problem is having the car off for an extended amount of time to allow things to cool down. Does anyone know what could be causing this? The dealership had no idea because I can't get the car to do the problem when I bring it to them. > Hello, I have a 99 Monte Carlo with about 140k miles on it. A few months ago > I had the transmission fluid replaced and it started doing weird things a [quoted text clipped - 11 lines] > Does anyone know what could be causing this? The dealership had no idea > because I can't get the car to do the problem when I bring it to them. Could be faulty vacuum modulator, check for vacuum at modulator supply hose, if vacuum good, change modulator I was reading up on the internet a little about the modulator. It said it's mounted to the side of the trans and a hose comes up to the engine. But it wasn't for my car, I was just reading general info. Do you know where it is on my car and/or where the hose is on the engine? Thanks for your input! >> Hello, I have a 99 Monte Carlo with about 140k miles on it. A few months >> ago I had the transmission fluid replaced and it started doing weird [quoted text clipped - 13 lines] > Could be faulty vacuum modulator, check for vacuum at modulator supply > hose, if vacuum good, change modulator This transmission does not use a modulator, all shifts are controlled by the computer. Who did the transmission fluid change, the dealer or a service shop? If the wrong fluid was used this might cause the problems you are having. I would take it to a transmission shop, get them to check it out. I was reading up on the internet a little about the modulator. It said it's mounted to the side of the trans and a hose comes up to the engine. But it wasn't for my car, I was just reading general info. Do you know where it is on my car and/or where the hose is on the engine? Thanks for your input! > Peter wrote: >> Hello, I have a 99 Monte Carlo with about 140k miles on it. A few months [quoted text clipped - 14 lines] > Could be faulty vacuum modulator, check for vacuum at modulator supply > hose, if vacuum good, change modulator > This transmission does not use a modulator, all shifts are controlled by the > computer. [quoted text clipped - 32 lines] > > Sorry if my info is outdated, still driving a 1981 car, which * has * a modulator, I agree with poster, trans fluid could be " wrong " I'd go to synthetic ATF for maximum satisfaction As for computer controlled shifts, yes modern trannys are computer controlled it was the dealership that did it. I will tell them. Thanks for your help >> This transmission does not use a modulator, all shifts are controlled by >> the computer. [quoted text clipped - 40 lines] > As for computer controlled shifts, yes modern trannys are computer > controlled |
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