When taking off from a stoped position the car will sometimes seem to pause it will then lurch forward and then she bangs and starts to shake on me. She is a 99 bonni ssei so far i have checked tranny fluid level is fine color is good. If you guys have any ideas would love to hear them. Oh also car has 67k on it. :?:

Service Engine Soon light? Have you scanned for codes, or can you? What fuel octane are you running?

The service engine soon light does not come on. I do not know how to check for engine codes sorry :( As far as fuel i have been running 91 premium octane.

Pressure Control Solenoid

Cheers,

It could be any number of things. You need to get the car scanned. Do you have an Autozone nearby? They should scan for free, as well as some other auto parts stores. We need codes to help diagnose.

[music on] oh oh the great decoder[/music off]

Just kidding :P , Will'* pretty thorough and loves codes

Cheers,

I am going to bring it back to dealership for a few other very minor problems i will have them take a look at this to. I will let you know what they find.

We must have posted at the same time. You thinking boost problems?

Thank you very much I will have mechanic check on this part

Not boost, transmission oil pressure. While I'm not positive this is the problem, the concerns match many complaints on a widely seen occurance. See below;

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) #00-07-30-002B - (Jul 19, 2002)
Table 1: Line Pressure Specification Table
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)
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 --Automatic Transmission).

Condition
Some owners of the above vehicles with a Hydra-Matic 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 below, 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 below. The pressures in the table assume a temperature of 70°C. The pressure will vary with a change in temperature.

Line Pressure Specification Table Pressure Control Solenoid Valve Current
Approximate Line Pressure*

Metric
English

0 amp
1675-2137 kPa
243-310 psi

0.1 amp
1662-2124 kPa
241-308 psi

0.2 amp
1613-2103 kPa
234-305 psi

0.3 amp
1551-2068 kPa
225-300 psi

0.4 amp
1448-1986 kPa
210-288 psi

0.5 amp
1310-1903 kPa
190-276 psi

0.6 amp
1172-1751 kPa
170-254 psi

0.7 amp
1000-1531 kPa
145-222 psi

0.8 amp
793-1227 kPa
115-178 psi

0.9 amp
565-896 kPa
82-130 psi

1 amp
469-641 kPa
68-93 psi

1.1 amp
448-552 kPa
65-80 psi

*Approximate Line Pressure is measured at an engine speed of 1400 RPM.


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.


Install a Scan Tool.

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


Start the engine and set the parking brake.
Check for a stored Diagnostic Trouble Code (DTC).
Repair the vehicle, if necessary.
Check the fluid level. Refer to the Transmission Fluid Checking Procedure.
Check the manual linkage for proper adjustment.



Turn the engine OFF. Remove the oil pressure test hole plug and install the J 21867.
Put the gear selector in PARK range and set the parking brake.
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.


Access the PC solenoid valve control test on the Scan Tool.
Increase the PC solenoid 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.
Refer to the Line Pressure specification table. Compare the data to the table.
If pressure readings differ greatly from the table, refer to Incorrect Line Pressure.
Remove the J 21867.
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.


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