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sprinkles08
sprinkles08, ASE Certified Technician
Category: Lexus
Satisfied Customers: 22983
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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Had my front struts replaced and now my 96 Lexus LS400

Customer Question

Had my front struts replaced and now my 96 Lexus LS400 engine is making a loud roaring sound and accelerates very slow.
Submitted: 1 year ago.
Category: Lexus
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

You seem to be describing transmission limp in. If the trans controller sees an issue that will prevent proper operation it will lock the trans in a single gear. This will make it appear sluggish on takeoff and cruising RPM's would be higher if you attempted to drive at a normal speed.

Have you checked for fault codes in the TCM?

Customer: replied 1 year ago.
I hook it up inside and there wasn't any fault codes.
Expert:  sprinkles08 replied 1 year ago.

What is your cruising RPM at 60 MPH?

Customer: replied 1 year ago.
After I started it up i heard the loud roaring sound coming from the engine. I got on the road and was going about 35 MPH. As I tried going faster that when the RPM shot up and it took awhile to reach 50 MPH. I cruzed home at around 40 MPH with the engine making the loud noise when pressing the accelerator.
Expert:  sprinkles08 replied 1 year ago.

What RPM's were you running at 40 MPH?

Customer: replied 1 year ago.
Not sure. Have to try it again tomorrow.
Expert:  sprinkles08 replied 1 year ago.

It sounds like the trans is either slipping or going into limp in.

Let me know what you find!

Customer: replied 1 year ago.
The RPM goes to 3000 at around 40 MPH.
Expert:  sprinkles08 replied 1 year ago.

It's not shifting then.

What did you use to check for codes? You specifically picked TCM from a module menu?

Customer: replied 1 year ago.
I use an action auto scanner ODB II code reader.
Customer: replied 1 year ago.
I did an ODB check and the code was 0353
Expert:  sprinkles08 replied 1 year ago.

Is it running rough then? That's an ignition coil circuit code?

Customer: replied 1 year ago.
Never mind about that code. It was a previous code. There are no codes.
Customer: replied 1 year ago.
I will have someone use a better reader to check the TCM and go from there.
Expert:  sprinkles08 replied 1 year ago.

The trans should actually be controlled by the engine controller on this rather than a TCM.

Is the engine running correctly? If it's low on power then throttle angle will be higher which can prevent shifting.