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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
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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
Expert Mechanic

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
Expert Mechanic

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


0/0 users found this helpful.

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