02 grand am, has slight hesition, at low rpm's. (example after a shift from 2nd to3rd). already replaced ignition module, coil pack spark plugs, converter, fuel filter,and had fuel injecters cleaned. I am at my wits end with this car, all these parts were replaced because of professional advice and by professionals. $2000 later still not working right. PLEASE HELP.
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Hello I would rebuild the carburetor or check the intake for vacuum leaks or leaking vacuum hoses, all these cause a lean mixture of fuel and that causes hesitation. The EGR valve opening to early due to a defective delay or other control device can also cause hesitation, disconnect the EGR to confirm the problem lies there and repair if needed
Why are you shifting from 2nd to 3rd gear ? is this a standard or automatic? If its a automatic its normal for the torque converter to catch up with the speeds of the tranny. To save the life of your tranny try to let the tranny do the work by itself and don't shift unless in adverse weather conditions.
Hello,well at what rpm it shifts at of course depends on how hard your pressing the accelerator at that moment,if you floor the accelerator it will shift at higher rpm (red line) but if you take off very slowly it should shift at a much lower rpm....but to answer your question 3000-3500 is a good shifting rpm( if the gauge red lines at 6000-6500 rpm) and firm shifting is a good thing,slow,sluggish and hesitant shifting is a sign of bad things to come from a tranny!! ps keep the engine oil,and transmission oil changed for long life out of your car engine and tranny. good luck and enjoy your new car......yz-maniac.
Auto transmission fluid needs changing; this is an area that gets neglected by a lot of people;check the fluid and if its brown or gives off a burning smell, it needs changing. Very old transmission fluid will cause slipping in the transmission; if this is the case, it should be changed along with the filter
Hope you find that this answers your question. Best of luck. Greg
p.s. If you have the fluid changed, make sure it's done from the tranmission pan, not through the filler tube; siphoning through the filler tube can be hazardous to the transmission, especially cars with a lot of miles
If you look under the cat. converter there might be a plug that you can
remove to clean it out with.If you remove the plug then just rib - up
the engine a time or two .That will clean it out for you.If the code
that Auto Zone pulled up was PO420 then you might start by replacing
the 02 sensor that's right before the cat. converter.