RPM high but car moves slow

[zacki]

Just acquired an EK with automatic transmission, recently experienced that the shifting is not as smooth as before, the thing is, the RPM shoots up when Im on the pedal but the car moves slow, until it reaches a certain RPM (3.5k~5k) and the car moves normally. just change the fluids with Honda brand 2 days ago, but the problem still exist

Anyone experience this kind of problem?

Thanks for your help.

 

[mc360]

Sounds like you need a new torque converter

 

[XpL0d3r]

Does this issue happen when the motor is cold too? Or only when it's reached operating temp. Could be an O2 sensor issue (I had issues very closely related to what you're experiencing)

 

[zacki]

Sounds like you need a new torque converter

thanks!
sounds interesting, can you please expand more sir, little confuse right now

 

[zacki]

Does this issue happen when the motor is cold too? Or only when it's reached operating temp. Could be an O2 sensor issue (I had issues very closely related to what you're experiencing)

yes it both happen even it is cold or reached operating temp.

by the way, also experiencing vibration when accelarating, varies only when I finally reached the desired gear speed

 

[mc360]

Torque converter is slipping probably, I don't know much about autos but the tranny puts the power to the ground, if it can't hold onto the engine then it can't transfer the power

 

[jackdog1]

Torque converter is slipping probably, I don't know much about autos but the tranny puts the power to the ground, if it can't hold onto the engine then it can't transfer the power

The torque converter actually uses ATF to transfer power to the gears.

A simple fluid change doesn't actually change ALL the fluid in the tranny (only about 2.9L out of ~6L), as some of it stays in the converter. It might fix the problem to get it drained and rebuilt.

How old is the car? Do you know when the last ATF change was before the one you did??

 

[Jnm136]

It's your speed sensor I believe, same thing happened to mine. Google it. Costs cheap, check the sensor before u do anything crazy

 

[nd4sped]

You may actually want to pull the trigger on a full system flush on your transmission. A high milage auto tranny drain and refill wont clean out all the trash that accumulates in the system and can clog up the fluid passages in the transmission, valve body and solenoids.

 

[jackdog1]

You may actually want to pull the trigger on a full system flush on your transmission. A high milage auto tranny drain and refill wont clean out all the trash that accumulates in the system and can clog up the fluid passages in the transmission, valve body and solenoids.

Doesn't doing a full flush on a really high-mileage transmission increase the likelihood of the transmission failing?

 

[nd4sped]

Doesn't doing a full flush on a really high-mileage transmission increase the likelihood of the transmission failing?

Absolutely not, and whoever may have told you that has no idea what they are talking about. What some transmission places may recommend is a high milage additive that contain aliphatic alcohol that causes the rubber seals to swell and reduce leaking.

 

[jackdog1]

Absolutely not, and whoever may have told you that has no idea what they are talking about. What some transmission places may recommend is a high milage additive that contain aliphatic alcohol that causes the rubber seals to swell and reduce leaking.

Okay, I'd just seen on another car forum that pressurized flushes can potentially damage a high-mileage tranny. Guess they were wrong.

 

[nd4sped]

Okay, I'd just seen on another car forum that pressurized flushes can potentially damage a high-mileage tranny. Guess they were wrong.

The pressure the system will see will never exceed the pressure that the system is normally under during operation. So technically no seal should fail during a flush. If it did then it was prone to happen during normal operation and this is because the owner did not properly maintain the vehicle in the first place.

98% of failures are due to owner negligence not manufactur faults.

 

[zacki]

thanks for all the inputs, I'll consider them one by one, stepping first on the easiest one, I'll just update you once culprit is detected.

 

[zacki]

by the way, solenoid has a leakage, fluids is evident around it, i think need to replace gasket or o-ring, is it somehow related on my case above????

 

[jackdog1]

by the way, solenoid has a leakage, fluids is evident around it, i think need to replace gasket or o-ring, is it somehow related on my case above????

No, that's just oil leaking from your VTEC solenoid. Mine does the same with no performance impact. And yeah, there are two gaskets you can replace (top and side).

 

[thendi]

Transmission flushes does actually damage the transmission which why a lot of manufactures void warranty when it's performed. Flushes are sometimes performed in a dealership when the transmission cooler in the radiator busted. Also, it worse for a transmission that never had drain and refill done at the correct intervals. Reason being the being the metal debris that builds up will be pushed and can block passages, checks balls, and damage the clutch packs by removing it's material. It would better to drop transmission pan clean it, run new fluid, and run it then repeat it a couple of times but if the transmission was never maintained properly to begin with then the damage is already done.