This is a 2000 Chevy Malibu, 3.1 V6 with Auto Trans. The problem I'm having is something with shifting. A long time ago it got to the point where even granny driving it, it did not want to shift. Rpm would go up and up with no shift. My mom took it to the dealer and all she told me was it was something with the fuel and air. That was when it was under warranty. Well now the car has about 94,000 miles and it will still happen a little bit. With the A/C off the car doesnt want to shift when you get on the throttle, I've learned to ease off the gas when its about to shift and it works good. Without the A/C on it runs a lot better and has more power. Maybe its just a quark to the car or transmission but its really annoying. I've changed the fluid in the trans at like 85,000, and it was not burned. I put 75k Plus fluid with the extras in it. The car is well maintained. I use only synthetic oil, it has a K&N Air filter. No leaks. I changed all the vacuum hoses, even the ones only by the dealer. It has new plugs, wires, and pcv valve. Cleaned the MAF sensor. No codes, even when it acts up. Do all malibus act like this ?
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Re: Extended shift time when hard on the throttle.
I have read numurous things on the throttle position sensor, and if the tps is bad or out of adjustment it makes a big effect on how the transmission shifts.i am having the same problem with my 3.1. also the map sensor controls the fuel delivery and ignition timing!!
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P0101....Mass or Volume Air Flow Circuit Range/Performance Problem P0121 - Throttle Position Sensor/Switch A Circuit Range/Performance Problem. P0420 - Catalyst System Low Efficiency
there is criteria that enable trans shift
solve codes problems then transmission will shift normaly
Shift suddenly become very hard. When going from park to either
reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh.
All gears seems to work. Problem may be intermittent: Check Throttle Position Sensor (TPS) for smooth electrical response. If the response is jumpy or erratic at all, replace TPS. Good luck Auto Zone or Parts Source has this part and can be replaced with in 20 min. Both parts store will have the step by step instructions and i believe the cost is around $65.00 for the TPS which is better then a transmission replacement.
u need to have the system tested for trouble codes, but u most likely have a defective trans 1-2 shift solenoid. to replace this u will need to pull the trans pan off the solenoids are attached to the valve body, also check the trans connector for water or corrosion.
If the van shifts ok when cold but hard when hot then the pressure control valve in the trans is bad. When the fluid temp climbs past a certain point the PCS sensor shorts out and stops controlling fluid pressure. This usually causes a whine from the trans (pump) and hard shifting. This is because the PCS can no longer control the pump pressure so the pump now runs at full pressure and shifts as if you were using full thottle all the time - the opposite of what your doing, which is to feather the throttle trying to ease the shift. So now the trans calls for a full pressure shift when your using part throttle and it slams. The (PCS) part is cheap enough but the trans has to be removed to replace it and that's not cheap.
Give this a shot, it often works and it's cheap enough to try.
First, have a good mech carefully check the rediator trans cooler section to be sure there's no leakage of coolant from the enging to the trans coller section of the radiato. This is important!, if antifreeze is leaking into the trans fluid via the cooler it'll cause problems that are otherwise impossible to diagnose and eventually complete trans/torque converter failure.
If there's no radiator problem then power flush the trans and change the filter, then install an aftermarket trans cooler in series with the built in cooler (the instructions with the cooler detail this). It's about $60 for the cooler and maybe one hour to install it.
This whole process will drop the trans fluid temperature 40-50 degrees and often that's enough to get back into a temperature range that will allow the PCS to work reliably again.
If it doesn't work your not out much, if it does work you'll probably get another couple of years out of it.
The problem is a known issue with the 1 to 2 shift at hard throttle. The fix is a repair of the entire 2nd clutch assy. in the transmission. There is a TSB about it released by Chevy. It will need that rebuild for the sudder to go away, or you can try and let off it at shift to stretch more miles out of it.
Does this trans have a throttle valve cable?, if so it may need to be re-adjusted, it controls when the trans shifts based on the throttle position, if it doesn't have this type of hydraulic control you may have an issue with one of the sensors that controls the shift points, a common issue is the throttle position sensor (TPS) and the MAF/MAP (Mass Airflow Meter) sensor, have you had a trouble code test run to see if any codes are present? if not Kragen does it for free as well as others like Auto Zone, let me know what u find and I will make every effort to help u figure this out.