Ls400 Vibrates While Driving And Stopped At Signal

[VMM]

When I drive my car LS 400 1990, it starts shaking (shivers ) time to time. If I am driving it uphill, all off sudden the car starts shaking, and feels like, Iam loosing power. The same thing happens when I stop at the signal. It shivers and comes back to normal ( Inotice hte RPM goes negligibly down while it is shivering). No engine lights are on. I checled up the car with local mechanic and they cleaned the fuel system, and nothing happened. The problem is still there. Iam not sure what is wrong with the car, please advice.

Thanks in Advance.

[damon]

Check the transmission mount (also called the rear motor mount). Mine was shaking up a storm, replaced it, and now it is smooth as silk.

[Reyi]

When I drive my car LS 400 1990, it starts shaking (shivers ) time to time. If I am driving it uphill, all off sudden the car starts shaking, and feels like, Iam loosing power.  The same thing happens when I stop at the signal.  It shivers and comes back to normal ( Inotice hte RPM goes negligibly down while it is shivering).  No engine lights are on.  I checled up the car with local mechanic and they cleaned the fuel system, and nothing happened. The problem is still there.  Iam not sure what is wrong with the car, please advice.

Thanks in Advance.

←

I think the most common cause of your problem (according to research on this forum when I had a similar problem) is that you need to have your throttle body cleaned, or your engine might not be getting enough air. If you do a search on this forum for "stutter" or "shudder" or "hesitate" or "hesitation" I am sure you'll be able to find a solution.

(By the way, my problem was caused by the dealer power washing the engine, which messed it up somehow. After about 350 miles of driving the shudder went away. If you've just power sprayed your engine, that could be the cause)

[VMM]

When I drive my car LS 400 1990, it starts shaking (shivers ) time to time. If I am driving it uphill, all off sudden the car starts shaking, and feels like, Iam loosing power.  The same thing happens when I stop at the signal.  It shivers and comes back to normal ( Inotice hte RPM goes negligibly down while it is shivering).  No engine lights are on.  I checled up the car with local mechanic and they cleaned the fuel system, and nothing happened. The problem is still there.  Iam not sure what is wrong with the car, please advice.

Thanks in Advance.

←

I think the most common cause of your problem (according to research on this forum when I had a similar problem) is that you need to have your throttle body cleaned, or your engine might not be getting enough air. If you do a search on this forum for "stutter" or "shudder" or "hesitate" or "hesitation" I am sure you'll be able to find a solution.

(By the way, my problem was caused by the dealer power washing the engine, which messed it up somehow. After about 350 miles of driving the shudder went away. If you've just power sprayed your engine, that could be the cause)

←

Thanks for the reply, I will look thruthe suggested topics.