Jump to content

Stuttering At Highway Speeds


sanstoetter

  

5 members have voted

  1. 1. What's wrong with my car?

    • Transmission Fluid/Fillter need to be changed.
    • Transmission is dying.
      0
    • TPS sensor
      0
    • Driver Error
      0
    • Something Else


Recommended Posts

I have a 94' LS400 w/ 190,000 miless, and since I've owned the car its been flawless. Lately the car seems to stutter between speeds of 50-70mph, or under load around 45mph. The car seems to free rev smoothly, and pulls smooth if I run it WOT, so it seems like a partial throttle issue. With that in mind it seems like either a transmission issue, or maybe the TPS sensor on the fritz. My plan is to change out the trans. fluid and strainer soon, but I wanted to check on here first to see if anyones had this issue before... if so what was the underlying problem?

Link to comment
Share on other sites

I have a 94' LS400 w/ 190,000 miless, and since I've owned the car its been flawless. Lately the car seems to stutter between speeds of 50-70mph, or under load around 45mph. The car seems to free rev smoothly, and pulls smooth if I run it WOT, so it seems like a partial throttle issue. With that in mind it seems like either a transmission issue, or maybe the TPS sensor on the fritz. My plan is to change out the trans. fluid and strainer soon, but I wanted to check on here first to see if anyones had this issue before... if so what was the underlying problem?

Have you already checked the Transmission mount to see if it needs replacing? that's a main contributer if your stutter seems like a vibration -

Link to comment
Share on other sites

I'll probably replace that while I'm working on the car, but I doubt it's a vibration from that. The car shudders noticeably, and it reminds me of a trans. trying to search for a gear. It also feels the same with O/D on and off at 55, and comes and goes kind of randomly. On steeper hills I've noticed it happening every time if I keep the car running a steady 45mph, and it happens every few seconds.

Link to comment
Share on other sites

I'll probably replace that while I'm working on the car, but I doubt it's a vibration from that. The car shudders noticeably, and it reminds me of a trans. trying to search for a gear. It also feels the same with O/D on and off at 55, and comes and goes kind of randomly.

ok, now I see what you are saying. fluid and filter change wouldnt hurt anyways!

Link to comment
Share on other sites

I'll probably replace that while I'm working on the car, but I doubt it's a vibration from that. The car shudders noticeably, and it reminds me of a trans. trying to search for a gear. It also feels the same with O/D on and off at 55, and comes and goes kind of randomly. On steeper hills I've noticed it happening every time if I keep the car running a steady 45mph, and it happens every few seconds.

How does it perform on steeper hills at 45mph and locked in 3rd gear?

Link to comment
Share on other sites

I had a very similar problem when I first got my car. It seemed to go away after I replaced the plugs and wires. I also used an excessive amount of sea-foam both through the gas and a vaccum line. That all seemed to clear it up. Another thing you might consider if you want your engine to run more smoothly is cleaning your throttle body. Mine idled and accelerated smoother afterwords.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...

Forums


News


Membership