03 tiburon 5sp i shift from 1st thru 4th if i shift fast the engine rpm's keep going up till i lift up on the gas, do the rpm's go down does the transmission seem to catch up, but it will not do it if i go slow thru the gears 97,000 mi it is a great car who would I go to transmission or engine shop?
The slave cylinder for your clutch has a valve in it, which keeps the clutch from engaging too quickly. The purpose is to keep you from just dumping the clutch and wreaking havoc on your transmission. If you're confident that you don't need that extra safety device in there, you can remove it, just google slave cylinder valve removal. It will give your clutch more of an aftermarket feel.
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Sounds like a vehicle speed sensor, it governs shifting based on engine RPM vs Transmission RPM among other things. Located usually on the rear tailshaft or rear transfer case on the majority of 4L60E automatics.
Sounds like the tv cable is out of adjustment. Take it to a transmission shop and have it adjusted properly. If you don't you can burn up the transmission. The cable controls fluid pressure and shift points.
I would check into the Trans oil temp sensor,they are known to keep the trans from shifting into 4th gear if they have a open or a shorted circuit...This may also be the culprit for the other issues you are experiencing when the trans is at diff temps and doing diff things....The other thing that is known for going bad in that Transaxle is the Sunshell...The splines on the inside of the sunshell strip out and than you will lose pretty much all forward gears,Except for 1st gear most likely and you will also lose Reverse if the Sunshell goes bad...But this will not act any different if the temperature is cold or hot
You'll want to doublecheck & make sure the Overdrive is turned on. That's a high rpm for 55, even high I believe for Interstate cruising at 65-70.
Possibly get back to the dealer immediately if it's not the Overdrive switch.
There are issues with some models that concern the RPM staying around 4,000 even at idle & under the right circumstances, a transmission won't shift as it should based upon engine & driving signals that the Trans computer uses to determine when to shift.
Check your fluid first & remember, Overdrive doesn't work until the fluid reaches a certain temperature.
Your going to have to get the ECM scanned, Auto Zone scan's for free and most garage now will scan for $10.00 to $15.00 since they all have the scanners now and need the business.
You could have a Vehicle Velocity Sensor (V V S) going bad or the wire harness it self. The V.V.S tells the ECM how fast the drive shaft is rotating and calculate's what gear it should be in relative with the engine speed and throttle position, and transmission fluid pressure.
Regardless you need the Blazer scanned to pin point why your transmission is shifting the way it is. Could be as simple as time for transmission oil and filter change for $125.00 or a loose wire harness.
Check your transmission fluid and try not to run the blazer to hard, to replace the transmission start at $1,900.00 for a rebuilt.
Good luck and hope this helps. Keep me posted