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2003 Lexus GS430 Question: why does my car hesitate and cut out when I give it gas

 

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1rick1, 4.3L V8, Chandler, AZ, February 23, 2014, 18:33
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At first my car would hesitate when cruising along and I would have to accelerate quickly, but all of a sudden it does it now when just starting out slowly. The vsc and check engine lights have come on several times, when climbing steep grades it seems. I remove the battery cables and the lights clear until I put a load on the engine. The lights are not on now, but it cuts out all the time when applying gas. The car starts and idles fine. Thank you!

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  • Answer #1

    G. T. Service Center (4231 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG February 23, 2014, 18:37
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     Master

    Have it scanned when the light is on for better information and then post the codes so we can help.

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    1rick1, February 23, 2014, 20:38
     Rookie

    Thank you, I'll do that!

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    ProfessorG, February 24, 2014, 06:18
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    Good deal

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  • Answer #2

    Greg's Orange Auto (14224 Answers) , Orange, CA - (714) 361-9386
    globalhelper February 24, 2014, 06:41
     Master

    could be mass air flow but the code would help

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    1rick1, March 03, 2014, 17:42
     Rookie

    I cleaned the MAF sensor with MAF cleaner and replaced the K&N air filter with a regular one. This made a tremendous difference, but when idling, if the accelerator is depressed quickly there is a definite hesitation at first and then the engine revs normally.This also happens when driving and the accelerator is depressed quickly for increased speed, there is a momentary hesitation, but then the car responds smoothly and with the power it used to. Any suggestions? Thank you.

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