Question about Pontiac Grand Prix
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 ?
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
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
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
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
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
tranny si sliiping due to worn clutch disk you will need to have it serviced / rebuilt
Posted on Jan 19, 2010
Testimonial: "Thank you so much for your feedback."
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?
- 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!
Posted on Feb 02, 2010
Testimonial: "Excellent feedback, thanks!"
Tips for a great answer:
Aug 26, 2016 | Ford Cars & Trucks
Feb 20, 2013 | 2002 Oldsmobile Bravada
Sep 10, 2012 | 1990 Honda Accord
Nov 22, 2011 | 1992 Dodge Dakota
Nov 15, 2009 | 1996 Chevrolet Lumina Mini
Jan 10, 2009 | 2000 Mitsubishi Montero Sport
Dec 20, 2008 | 1992 Lexus Es 300
128 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: