Question about Pontiac Grand Prix

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Going from second gear to third gear

Once I reach 55-60 mph it seems as if the car can't go any faster. It starts to shake a little bit and If I floor the pedal it still doesn't make much of a difference. I have to let completely off the pedal and slow down to about 50 or so and then apply the gas to get past that 55-60 mph point. It is a used car and I just got it so I'm not sure what has been done to it thus far. It has had a fresh oil change and has adequent transmission fluid. What else could I do ?

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Does this vehicle have an rpm gauge? if so what does it go to when it is at 60 mph? has it had a tune up? it may need plugs and wires

Posted on Feb 14, 2014

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Posted on Jan 02, 2017

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SOURCE: Trans clunking when slowing down

Sounds like youi may have a few serious problems going on to have that kind of back lash occuring at higher speeds. I have experiance with low spped clunks on Bronkos and your type of vech being a car dealer. One you might try for low speed clunk on take off and braking at stop likts just completeing a stop? Pull the drive shaft and lubricate the splin - two check your leaf springs for weakness and wore bushings - take a look at your shocks - three u bolts holding springs to rear axle housing may be letting the axle housing actually dip or tweak or all those thing in combination - now you may have some serious slop in the pig - transfer case may be causing that clunk - as far as high spped clunk and activity you have a serous problem and you just might drop the transferr case have an accident fliping over..............Mike South Bend Indiana don't just keep driving and making problem worst...........

Posted on Sep 27, 2008

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SOURCE: 2001 Buick Regal, 3.8L, 98,000

This happened to my 2001 Regal... There is a factory recall on the Catalytic Converter going bad. I had mine replaced with the recall and haven't had a problem since

Posted on Oct 10, 2008

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SOURCE: when i start car it sputters and shakes until 45 mph.

spark plugs wires needs complete tune up also synthetic oil change not designed to run on regular oil then check bearings

Posted on Mar 18, 2009

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SOURCE: 2004 Hyundai Elantra GT (manual)Loosing speed/power while driving

tranny si sliiping due to worn clutch disk you will need to have it serviced / rebuilt

Posted on Jan 19, 2010

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KCGTODAD
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SOURCE: Transmission issue? Or worse?

Hello! Although the symptoms you've described could be a result of quite a few things, I have a few questions that might help determine your problem.

1) What year/make/model did the new transmission come from?
2) Is the SES (Service Engine Soon) light on? Is it blinking?
3) Was this transmission a rebuilt or used unit?
Some possibilites:
- you could have a faulty TPS - or Throttle Position Sensor.
- you could have a problem with the input shaft piston being worn. (Hence the used vs. refurb trans question). Once the inner sealing area wears it can prevent the inner lip seal for the piston from sealing properly. You may find that revving the engine up will finally get the car to move and it will BANG into gear. This is because the pump in the transmission is working harder and moving more fluid thus allowing the added fluid to overcome the leak which prevented the clutch from either initially applying or staying applied. Another area of concern that causes this is a boost valve in the valve body, not near as common but it can cause this problem on a lessor scale.

- Trouble Code P0742 TCC Stuck ON:
When this trouble code is set the pcm will command max TCC and lock adaptive shifting. This code can be broken down into three potential problem areas as found to be common in the field.

1. This problem can be a mechanical problem. Possible causes of this could be a bad or stuck TCC switch that signals the pcm of current TCC operation. Another cause though not common is a stuck TCC switch or apply valve. If it is physically stuck in the wrong position it can cause the TCC to be stuck on all the time and even kill the engine when the vehicle is put into gear.

2. This problem can be found to be an electrical problem. If the wire from the TCC pressure switch to the pcm is grounded anywhere in the path it can throw this code. This could be a wire shorted inside the trans on the internal wiring harness or the actual engine wiring harness. If the wire is grounded the pcm thinks that TCC is on when it shouldnt be and will throw the code.

3. This problem can be a hydraulic problem. This is the most common cause of this code that I have found and stems back to a clogged TCC solenoid, not because it failed. Excessive debris in the transmission or a failing torque converter lockup clutch can cause the solenoid to have debris stuck inside and this causes a restriction in fluid flow through the solenoid. If the solenoid can not bleed off the pressure the TCC can be stuck on. If the wrong TCC solenoid is installed during an overhaul this problem can also arise as a late 4L60E solenoid is identical but does not operate the same and acts like a clogged solenoid. As mentioned in problem #1 a stuck TCC apply valve is a physical problem but causes a hydraulic problem because the fluid pressure will not properly bleed off because the valve is stuck in the wrong position instead of being able to move freely in the bore of the valve body.
Above are the common causes of this code, there are other possibilities but those are what generally causes the fault. A thorough diagnosis is the only way to determine what is really at fault and a new TCC solenoid should never be assumed as the actual problem until verified.


HTH - and thanks for using FixYa!

-KCGTODAD

Posted on Feb 02, 2010

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From what you say Daniel, your kickdown cable need's to be adjusted, here's how :

Down at the pressure lever on the front of the trans, loosen off the cable retaining nuts so there is a little slack in the cable.
then start taking the slack out of the cable a little bit at a time;
Rest a long screwdriver on the end of the pressure lever, holding the screwdriver with one hand start opening the throttle with your other hand.

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