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Jeromy Madison
Jeromy Madison,
Category: Lexus
Satisfied Customers: 78
Experience:  Owner/Technician at Mad Auto Repair
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I have a Lexus gs300. 300k ***** *****. Between 45 and say

Customer Question

I have a Lexus gs300. 300k ***** *****. Between 45 and say 55 or 60, the car will shudder. Once I get into overdrive. Also, the car seems to run a lot better when it is warm. I don't notice it as much or at all. Not sure if its a transmission or sensor, but don't want to put out a lot of money for someone to search for the problem without knowing. Any help would be appreciated.
JA: Thanks. Can you give me any more details about your issue?
Customer: I thought I just did. My name is Rob.
JA: OK got it. Last thing — Lexus Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.
Category: Lexus
Expert:  Jeromy Madison replied 1 year ago.

Can you explain the shudder? Do the rpm's change?

Customer: replied 1 year ago.
It feels like its trying to shift into overdrive but its jumping back and forth between forth and overdrive. Its a 1999. The rpms don't seem to change a whole lot when this happens. The engine light flickered on and off this morning when it was happening but then went off. Again, once it was warm it seemed to work better. Does this help
Expert:  Jeromy Madison replied 1 year ago.

Yes, a little. How long have you had it? Do you know the condition of the spark plugs to start with?

Customer: replied 1 year ago.
I have had the car since 2003. Great car. I don't know the condition of the spark plugs. I had the timing belt replaced and those changed a few years back.
Expert:  Jeromy Madison replied 1 year ago.

Ok, do you have a scan tool to check for codes? Or to read live data to check for misfires?

Customer: replied 1 year ago.
No. Should I take it to Advance or somewhere and get them to scan for the codes?
Expert:  Jeromy Madison replied 1 year ago.

That might get you a place to start, but you might need more than that to see the whole picture of the problem.

I suspect something with the ignition system. spark plugs, coil, or maybe an injector

Customer: replied 1 year ago.
Not transmission?
Expert:  Jeromy Madison replied 1 year ago.

I doubt the transmission. It may feel like the transmission and many people start there, but with everything computer controlled it will feel like transmission if the vehicle is putting out too little power because of an engine issue. I hope this helps.

Please let me know what codes you find.

Customer: replied 1 year ago.
This is great. I just got a new battery would that cause any issues
Expert:  Jeromy Madison replied 1 year ago.

That is unlikely.