Q: Transmission slips off line under mid-full throttle

asked by on September 15, 2016

This has been a really good car, but lately I've been having trouble with the transmission. If I'm not in first gear, the transmission starts slipping off the line under mid to full throttle. In addition to that, when I'm on level surfaces it has begun to surge at constant speeds. This does not happen on hills, inclines, declines, etc.; only on level paved good road surfaces. What is causing this and what do I do to get it fixed?

Hello there, thank you for asking about your 1998 Oldsmobile LSS. The first thing to have checked in a situation like this is the transmission fluid level. Using the directions laid out in the owner’s manual, inspect the transmission fluid level and condition. A low fluid level from a leak can cause many problems as the automatic transmission is a hydraulic unit. Hire an experienced technician, like the ones at YourMechanic, to inspect the slipping problem and refill the transmission fluid if necessary.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Transmission noisy in all gears, at around 2500 RPM

The noise may not be coming from the transmission but the engine since you say it happens at 2500 RPMs no matter what gear is selected. You may be hearing the intake manifold runner control noise changing at that engine...

Shifting won't go into gear - 1973 Chevrolet C20

Check fluid level in the transmission. Did you correctly engage the front pump with the torque convertor, and filled the torque convertor with fluid before installing it? Let the truck idle 15 minutes or so, and check for Drive/Reverse after...

Ratcheting sound in front left wheel area.

The noise is from within the transmission. This vehicle has had many noted complaints for various problems with these transmissions. I would recommend having a dealer check the transmission out since you are under warranty. However, if you'd like a...

Related articles

How Long Does a Throttle Body Temp Sensor Last?
The The throttle body is an important part of your vehicle and should be monitored regularly. The throttle body temp sensor is a sensor that is mounted on the throttle body. It monitors the temperature of the throttle body and...
How Long Does a Transmission Filter Last?
Your Your transmission filter is a very important component in your vehicle, because it’s the front line of defense when it comes to keeping contaminants out of your transmission fluid. Most automobile manufacturers recommend a transmission filter change every 2...
How to Replace a Throttle Controller
The throttle controller uses data to open and close the throttle. Common signs of failure include poor performance, stalling, and and rough idling.