Need Help?

2003 Lexus SC 430 Base 2dr Convertible

2003 Lexus SC 430
Trim Info:
Rear Wheel Drive, 2 Door Coupe, Sub-Compact
18 mpg city / 23 mpg hwy
Other Trims
Do you own this car?
Estimated Mileage
Enter current mileage for most
accurate info about this vehicle

Track Your Service Records
Get Recall Alerts
Get Updated Value Estimates on Your Car.
back to question list

Ask the Community

Ask Our Auto Mechanics

July 19, 2012, 5:05 am

Syd S

Question: Stalling Engine

I purchased a used SC430 with 95,000 miles about a year ago. Soon afterward, it began to stall, similar to vapor lock, during acceleration and even with steady driving. It also stalls occasionally upon initial start from a stop. This has continued, regardless of weather, and it is intermittent. I have found that it can be overcome by releasing the gas pedal for a few seconds, then depressing it again. The stalling has never caused the engine to stop completely and idle is fine at all times. I would say the frequency of this hesitation averages about six times for a 20 minute drive.

My wife recently drove it to our new home. I forgot to mention the stalling to her, and she said it caused her to drive quite some distance at 45 mph even with the accelerator almost floored. I suggested taking her foot off of the accelerator for a few seconds, and this also worked for her. I had thought it might be a fuel filter, but I understand these are almost lifetime filters, can be difficult to change, and we have only 97,000 miles on the vehicle at this time.

I have tried different fuel octanes and used a can of water remover, all with no change to the stalling. I would very much appreciate suggestions on what might cause this and how to remedy it.

Haven't had stalling for about a month, but have driven it very little. Doubt that the problem has resolved itself.

July 21, 2012, 6:23 pm

Elizabeth K

That could be a few different things. First to check: air filter, clean MAF (mass air flow) sensor, clean throttle body. Check MAF sensor and TPS (throttle position sensor) readings. Check fuel pressure (could be bad fuel pump). Any of these could be off and not set a code.

1/1 users found this helpful.

July 21, 2012, 8:28 pm

Syd S

Excellent suggestions. I'll try these.

0/0 users found this helpful.

July 21, 2012, 9:42 pm

Elizabeth K

You're welcome. Let us know how it goes.

0/0 users found this helpful.

Ask our panel of certified auto mechanics a question. We pay for their advice so you don't have to

My Auto Score

See the free AutoCheck score

Meet The Experts
Kim Perrin
Kim Perrin is our resident mechanic here at DriverSide. Kim worked as…
Tyler Orr
Tyler Orr is an expert in German and Japanese cars and has been a mechanic …
Elizabeth Kriesten
Elizabeth Kriesten worked as an automotive technician for several years at Dodge…
Tips on Servicing

Car Brakes: How Do You Know When to Change Them?

By Zach Bowman For those who suffer a daily commute through heavy traffic, your vehicle's braking system can bring thousands of pounds of metal, plastic and empty Starbucks cups to a stop hundreds of times before you get to work. It goes without saying that these pieces wear out, but they do so slowly, meaning you may not notice they need attention until ...

Read more…