Question about Buick Park Avenue

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My car has 77,000 miles on it. It shifts thru all gears fine and seems the converter locks up at 40mph and then at 50 I see the tach jump 300 rpm like it comes out or that is when it suppose to shift into overdrive but does not. I took it to a local cottman trans shop and he thought the computer had a problem communicationg with transmission. There was a tcc code in there. He cleared all codes and advised me to change computer. I got another computer out of the same exact car and year but trans still shifts the same. I did not service the trans yet. Any ideas? Thanks Bruce

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I would recommend that you run a can of Seafoam (there is one specifically for transmissions) in your transmission, then change the fluid and filter. You may have a sticky valve body in the transmission, or a dirty filter.

Posted on Mar 17, 2011

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2007 M35 automatic transmission shift gears fine, but after last gear is shift the overdrive remains on. The RPMs seem a bit high when driving above 60. Any thoughts?


Sounds like the lock up in the torque converter is not locking up so your RPM's should be running about 500 rpm's higher. If I am correct either it went bad or not getting signal. I do not repair so I would say to take it to a transmission shop that you trust.

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Why is my 2000 kia sportage 4x4 getting such a high tach reading2700 or higherwhen i drive 50 mph or faster with it in 5th gear?


Are you sure you are counting the gears right? Sound like Torque converter lockup is not working.

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What's the normal rpm while shifting gears on an automatic 2006 c230?


No such figure. Shift points can be near the redline RPM or just above idle, it depends on hard you press the gas pedal.

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1998 jeep grand cherokee 4x4. have the p0740 code. have to start from neutral, then shifts faily well. May start fluttering and making noise, have to put back to N, then to D and once again will shift. ...


P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

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1 Answer

Rough start, smell gas


For the RPM's jumping up and down i would replace the throttle position sensor. If it smells like bad gas or rotten eggs these are signs that the cat. converter is going bad. For the poor gas mileage replace the fuel filter.

May 08, 2010 | 2000 Mitsubishi Eclipse

1 Answer

1998 Yukon high idle sound with bad gas mileage.


What you have is the torque converter clutch,cycling on and off.
When it is off.your rpm will go up and your milage will go down
First-check to see if your brake switch, on the back of the brake peddle, is loose or misadjusted. When you apply the brakes,the first thing to happen, is that you unlock the converter,so your trans is not connected directly to the motor,or you would stall. Then below 42 MPH,your trans is working off the converter, as a pressure multiplier ,based on rpm
Second- switch okey. You remove trans pan and change TCC Solenoid.

Let me know if if you need more guidance

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1 Answer

My 350c will not shift into overdrive all other gears seem to shift fine.


This is not an"overdrive" transmission,but it does have a locking torque converter.That makes it feel like fourth shift at times. Now for the problem:the converter clutch is powered thru the brake switch to a vacuum sensor (on the firewall about 11o'clock behind the brake booster) then to the trans.Check the vacuum hose to the sensor,they get dry and crack up there and near the carb.
You can verify the function of your lock up by jumping the wires at the sensor,but it will lock as soon as you hit 3rd gear regardless of speed.If you tap the brake pedal it should unlock briefly,then re engage.Good luck

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1 Answer

My H2 2003 hard or take time to shift when running to 35+ MPH


check your tranny fluid and filter. you may have a clog some where or could be low on tranny fluid.

Jul 25, 2009 | Hummer H2 Cars & Trucks

1 Answer

Could my transmission be slipping


Quick check is to accellerate from a stop with steady even pressure on the gas. Watch the tach. It should have a good shift at approximately 2000 rpm and the tach should not jump higher during the actual shift (called flairing) This should be the same for each shift. Converter lockup (4th gear shift) should cause tach to drop about 500rpm and should happen at about 45mph. Then repeat the same process using a more agressive acceleration.
Shift points in rpms may be a bit higher but each shift should not flair. To check lockup, while driving at about 50mph, lightly touch brake pedal and you should feel ti disengage for a moment. Since you have an opportunity to return it, It would not be a bad idea to get a hands on evaluation from another shop you trust...I can't see it from here and a live person is better equipped to give an informed opinion.

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