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Old 06-12-2006, 04:24 PM
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2000 Buick tranny shifting weird?

I drive a 2000 Buick Century, 3.1l engine and it has developed a shift that is somewhat similar to a nasty shift kit. The shifting is accompanied by a whining noise, that builds as the rpm's build, then subside with each gear change. This thing shifts with a solid clunk! I have noticed when the tranny starts acting up, the temp gauge is higher than normal. Took the temperature off the hose at the thermostat and got 210*. This is not critical, but the outside temps are only in the 80's, and I'm afraid it may get worse when the heat builds later this summer.

Any ideas guys?

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Old 06-13-2006, 12:40 AM
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newer cars run hotter, 210 seems about normal. new cars also have computers that adapt to a persons way of driving, if you drive with a light foot. the shifts will generally be soft and soggy, but if you let you son or grandson drive it, when you get it back, it would have adapted to there style of driving and even at light throttle be a hard shift..as far as the noise are you sure its coming from the tranny..it could be a wheel bearing. if you let someone else drive it they could have hit a curb or something.
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Old 06-13-2006, 12:54 PM
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Could also be a pressure regulator valve buzzing.... if it is not balancing correctly, you could have higher than normal line pressures, giving harsh shifts, and your buzz noise. It makes sense that it is trans related, as the buzz fluctuates with engine RPM.


EDIT:

Does it buzz when the car is not moving, and doues it change with RPM in neutral?
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Old 06-13-2006, 03:49 PM
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njbloodine666, pretty sure it's the tranny whining, it only whines when it's shifting hard. The temp guage in this car are hash marks, no temp markings, but it normally runs about 1/3rd of the guage and when it starts it's hard shift, it's always on 1/2 or more. That's why I shot it with an IR gun, and it was 210 at 1/2. Nothing alarming, but thought maybe the heat was effecting the tranny.

sbchevfreak, it makes the noise in or out of gear, moving or not. It does it infrequently, mostly when driving long distances, then getting off the interstate on city streets, that's when it usually starts.

Does the pressure regulator valve operate on vacuum, or fluid? Is this an internal or external part of the transmission? Guess I'll do a search to see what turns up. Good suggestion, appreciate that!
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Old 06-13-2006, 03:52 PM
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Wrong Place

Just realized, should have posted this in the transmission section, sorry! Just posted it in the tranny section!
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Old 06-13-2006, 03:58 PM
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On a 2000, it is probably a PWM solenoid.

EDIT:

I found this on ALLDATA, it is a TSB for your problem.

Quote:
Originally Posted by ALLDATA
File In Section: 07 - Transmission/Transaxle

Bulletin No.: 0O-07-30-002B

Date: July, 2002

TECHNICAL

Subject:
Slips, Harsh Upshift or Garage Shifts, Launch Shudders, Flares, Erratic Shifts and Intermittent Concerns, DTC P1811 or P0748 Set (Replace Pressure Control Solenoid Valve Assembly)

Models:
1997-1999 Buick Riviera
1997-2002 Buick Park Avenue
1998-2002 Buick LeSabre
1999-2002 Buick Regal
2000-2002 Buick Century
2002 Buick Rendezvous
1997-2001 Chevrolet Lumina
1997-2002 Chevrolet Monte Carlo
1999-2002 Chevrolet Venture
2000-2002 Chevrolet Impala
1997-1999 Oldsmobile Eighty Eight
1997-2002 Oldsmobile Silhouette
1998-2002 Oldsmobile Intrigue
2001-2002 Oldsmobile Aurora (3.5L)
1997-2002 Pontiac Bonneville, Grand Prix
1999-2002 Pontiac Transport/Montana
2001-2002 Pontiac Aztek
with Hydra-Matic 4T65-E (RPOs MN3, MN7, M15, M76)

This bulletin is being revised to add additional models and model years. Please discard Corporate Bulletin Number 00-07-30-002A (Section 07 - Transmission/Transaxle).

Condition

Some owners of the above vehicles with a HydraMatic 4T65-E transaxle may comment on harsh upshifts or harsh garage shifts, soft shifts, shudders on hard acceleration, or shifts erratic. These conditions may appear intermittently or set a DTC P1811 or P0748. During diagnosis, a low or high line pressure (actual versus desired) may be observed.

Cause

The above condition may be due to any one of the following which may affect line pressure output:

^ Sediment inside the pressure control (PC) solenoid valve, causing the PC solenoid valve to mechanically bind.

^ Sediment in the valve body, causing the torque signal regulator valve to stick.

^ Incorrect transaxle oil level.


Correction

Important: Any of the above conditions may be intermittent, therefore, this test should be performed at least three times.







Refer to the Line Pressure Check Procedure in SI, along with the Line Pressure Specification Table shown, to determine if actual versus desired pressures are within the values specified. The Scan Tool is only able to control the PC solenoid valve in PARK and NEUTRAL with the vehicle stopped. This protects the clutches from extremely high or low pressures in DRIVE or REVERSE ranges.

Refer to the Line Pressure Specification Table. The pressures in the table assume a temperature of 70C. The pressure will vary with a change in temperature.

If the actual versus desired pressures are not within the values specified, clean the valve body and replace the PC solenoid valve, if necessary.

Check the PC solenoid valve actual versus desired pressures to verify the new PC solenoid valve is responding correctly.

Refer to the Automatic Transaxle Section of the Service Manual for the proper repair procedure.

Line Pressure Check Procedure Tools Required

J 21867 Universal Pressure Gauge Set

Important: Before performing a line pressure check, verify that the pressure control (PC) solenoid valve is receiving the correct electrical signal from the PCM.

1. Install a Scan Tool.

Caution: Keep the brakes applied at all times in order to prevent unexpected vehicle motion. Personal injury may result it the vehicle moves unexpectedly.

2. Start the engine and set the parking brake.

3. Check for a stored Diagnostic Trouble Code (DTC).

4. Repair the vehicle, if necessary.

5. Check the fluid level. Refer to the Transmission Fluid Checking Procedure.

6. Check the manual linkage for proper adjustment.








7. Turn the engine OFF. Remove the oil pressure test hole plug and install the J 21867.

8. Put the gear selector in PARK range and set the parking brake.

9. Start the engine and allow the engine to warm up at idle.

Notice: Total test running time should not be longer than two minutes, or else transmission damage could occur.

10. Access the PC solenoid valve control test on the Scan Tool.








11. Increase the PC solenoid as shown actual current from 0.0 to 1.0 amps in 0.1 amp increments. Allow the pressure to stabilize for five seconds after each pressure change. Read the corresponding line pressure on the J 21867.

12. Refer to the Line Pressure specification table. Compare the data to the table.

13. If pressure readings differ greatly from the table, refer to Incorrect Line Pressure.

14. Remove the J 21867.

15. Apply sealant, P/N 12345382 (in Canada, P/N 10953489), to the oil pressure test hole plug.

Notice: Refer to Fastener Notice in Cautions and Notices.

16. Install the oil pressure test hole plug.

Tighten

Tighten the oil pressure test hole plug to 12 N.m (106 lb in).








Parts Information

Parts are currently available from GMSPO.

Warranty Information







For vehicles repaired under warranty, use the table shown.
Sorry, Jon, for the copy/paste, but I can't link to the ALLDATA site, as you need a business passcode.
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Last edited by sbchevfreak; 06-13-2006 at 04:04 PM.
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Old 06-13-2006, 07:28 PM
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sbchevfreak. . . you're the man! I don't know if this is something I will attempt myself, but at the very least I know more about the cure! Thank you for the info!
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