transmission shift shock
seem when mazda mpv warms while driving suddenly idling starts and speed ceases. I have to release the gas and start over sometimes this works and sometimes not to return to a few minutes of smooth riding. Also it jerks and when at stop light it urges for take of jerking all the while.
My car has 141240 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
Hi there. A lot of times, engine performance issues are mistaken for transmission issues. The loss of acceleration and jerking taking off could be, a lack of fuel pressure caused by a faulty fuel pump or fuel pressure regulator. Proper diagnoses should be performed to avoid unnecessary repairs. Assuming, the check engine light is not coming on, leads me to believe the ECM (engine control module)/computer is not recognizing the fault. Diagnostic tests should be performed. I recommend having your vehicle’s speed ceases and jerks be diagnosed and repaired by a certified technician, such as one from YourMechanic.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
Automatic transmissions that shift hard, jerk or shake during a shift change may mean your transmission fluid needs changed or fluid level is low. In manual transmission vehicles, abnormal gear shifts could indicate damaged gear synchros, worn clutches or other, more severe issues.
Shift shock is the jolt felt when transmission changes gear. This jerk or shock feeling is observed in. lower gear shift (i.e. 1-2 or 2-3) and not in higher gears shift (i.e. 5-6 or 6-7).
Transmission Fluid Low or Poor Condition – Vehicles low on transmission fluid or that are operating with worn out or contaminated fluid are likely to experience hard shift conditions. Lack of adequate lubrication within the transmission can cause several problems, including hard shifting.
Your automatic transmission normally operates smoothly when shifting from gear to gear. You shouldn`t feel any grinding, slipping or shaking sensations as your car switches gears. When a transmission is starting to have problems, these symptoms can seem insignificant.
Most of the time this car shaking is caused by the transmission, though it can sometimes be caused by a bent exhaust or one that`s different to the original. Vibrating, shaking and grinding can indicate serious problems with your transmission so it`s important to get your vehicle checked sooner rather than later.
Rough jerking when shifting
It might feel like a jerk, clunk or thud. This is usually caused by troubles with the vacuum, transmission fluid or a faulty sensor. The vacuum modulator valve helps older vehicles determine when to shift gears. There`s a hose that connects the valve with the intake through a hose.
This includes speed sensors that tell your transmission how and when to change gears. If your speed sensor is sending incorrect data, it can lead to hard shifting and other drivability problems.
3. Difficulty shifting is a symptom of a bad torque converter. You want to be able to shift gears smoothly. A bad torque converter will not allow for that.
The Transmission Range Sensor tells the PCM the position of the transmission shifter. The PCM uses this information to control which gears of the transmission to enable or disable. When the TR sensor fails it can cause wrong gear starts, no upshifts, or what feels like a falling-out-of-gear condition.
1. At the top of all auto repair experts lists for causes of problematic transmissions is low transmission fluid. Usually caused by a leak somewhere in the system, low or contaminated fluid makes it nearly impossible for the transmission to automatically shift gears and run smoothly.
What`s the secret to changing down gear smoothly? Maintain light pressure on the accelerator pedal as you press the clutch down, change gear and then clutch up gently (or the car will jerk). Using the accelerator will raise your engine speed to match your road speed, ultimately giving you a jerk free gear change.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
Kia Optima 2004 v6 LX new engine old transmission no problems before with transmission now my transmission is shifting a high rpm
ANSWER : Hi There,
This may be an issue related to the communication of the PCM and the TCM (Transmission control module). As you may know, the TCM relies on the PCM to transmit information related to RPM’s, which the TCM then uses to determine when to direct the transmission to shift. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.
This may be an issue related to the communication of the PCM and the TCM (Transmission control module). As you may know, the TCM relies on the PCM to transmit information related to RPM’s, which the TCM then uses to determine when to direct the transmission to shift. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform it’s function. Other functions controlled by the TCM are components such as a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your vehicle. I would suggest having a professional from Your Mechanic come to your location to properly diagnose your transmission problem.
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Transmission issues, rough shifting and noise
ANSWER : Many different faults can cause the vehicle to shift roughly. The most common would be low fluid level in the transmission, transmission mounts, the torque converter, or one of the shift solenoids. If you’d like to get this checked before moving forward with a repair, a qualified technician, such as one from YourMechanic, will be able to diagnose your shifting issue and perform any repairs required.
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Transmission intermittently won’t shift to next gear
ANSWER : It is very possible that the transmission may require a full rebuild or a replacement in order for it to perform properly. Although you are able to shift into other gears, if certain gears are not working correctly, transmission damage may be the cause.
If the transmission has already been diagnosed by the dealer that it needs replacement and the transmission is still not shifting properly, it is unlikely that the transmission will get any better without replacement.
It does not hurt to attempt any reset procedure that may be available, but it is also unlikely that a reset of any kind will resolve transmission issues. Small things to check before replacing the transmission if possible would be the fluid level and any trouble codes that may have been stored due to the issue your transmission is causing.
If any codes exist, this may lead you to other possible parts inside the transmission that may be able to be replaced and have your transmission working again as it should. You can get a second opinion from an local expert, such as one from YourMechanic, in order to diagnose your shifting problem and advise you on the next steps.
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07 charger v6 wont move, like its in limp mode, will shift solenoid fix this? wont move in reverse. thinking shift solenoid, help.
ANSWER : The check engine light could mean diagnostic codes related to the transmission failure are available. If you request a check engine light diagnostic a mechanic could see if relevant codes have set and narrow the diagnostic for you. Check to be sure that there is adequate fluid. Check to be sure that the manual lever (shift lever) on the transmission reaches the correct position when you select "D" or "R". If you can’t move in any gear, the problem is not likely to be the solenoids because failure of the solenoids will still allow operation in "some" gears, if the gear is manually selected. If the solenoids failed, such would also result in a code being output because the TCM performs continuous circuit integrity testing on the solenoids. You can test that part separately in any event. There is a 164 page repair manual, with all the diagnostics, that you can use to pinpoint and repair the issue. However, if you just want a diagnostic, you can request a transmission diagnostic – failure to shift and the responding certified mechanic will pinpoint the issue. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.
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Sometimes when I shift my car’s automatic transmission into Drive it stays in neutral. Reverse works and trans fluid is full.
ANSWER : It is very possible that you could have some internal transmission damage. I would recommend enlisting in the assistance of a qualified transmission professional to inspect your transmission for internal faults. I must warn that this could be a pricy inspection as it may involve the removal and disassembly of the transmission. However, this is a sure fire way to determine if any internal damage has occured. The good news is that if any damage has occured, it can easily be resolved at that time since the transmissoin has already been disassembled.
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Transmission can’t shift, thinks it needs to be replaced
ANSWER : The best advise to help prolong the life of this transmission is to service it regularly. Make sure you also service the engine cooling system on a regular basis since the transmission cooler is in the radiator. If you are in a warm climate or tow on a regular basis, look into getting an additional external transmission cooler installed. The transmission will run cooler and have less chance of heat-related failures. I also recommend you have a check up on the transmission before any warranty expires. Service any new transmission for the first time at 20,000 miles and every 30,000 miles after that.
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Transmission shift hard after high speed driving but shifts normal after engine is off for a while.
ANSWER : Hi there. Transmission fluid should be flushed every 50,000 miles to help avoid issues like you are experiencing. So, it’s probably a good idea to have your transmission fluid flushed and filter replaced, as the obstruction of debris or worn out fluid can cause the hard to shift issue you’re experiencing.
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2003 jeep liberty stuck in reverse, shifter is stuck…but crawling under and trying to manually shift from transmission stuck
ANSWER : Hi there. Based on what you have written above, it is highly probable that the inner linkage has come loose or there is an obstruction within the inner gear set that is causing your problem. Unfortunately, this typically requires dropping the transmission and repair or inspection from the inside. This is not a service our mobile mechanics are equipped to offer, so your best bet is to contact a local transmission specialist for assistance.
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