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Mike Kelly
Mike Kelly, Mechanic
Category: Lexus
Satisfied Customers: 5248
Experience:  17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.
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what makes my lexus ls400 cut cut when I hit the gas? I chnaged

Resolved Question:

what makes my lexus ls400 cut cut when I hit the gas? I chnaged the filter
Submitted: 1 year ago.
Category: Lexus
Expert:  Mike Kelly replied 1 year ago.


Hello, welcome. My name isXXXXX will do my very best to
assist you with your question.

Does the vehicle idle normal when not applying throttle?

When you say cut out,does the vehicle shut off?

Customer: replied 1 year ago.

yes it idles normal. no, I don't mean shuts off, just cuts back. when parked and running I give it gas and it's fine. just when driving it cuts back

Expert:  Mike Kelly replied 1 year ago.
Ok does the transmission seem to shift normal,no slipping?
Customer: replied 1 year ago.


yes

Expert:  Mike Kelly replied 1 year ago.
Ok the main reason that this will happen is because the fuel pump is bleeding down pressure.The idle will not be affected because there is still enough pressure to run the vehicle.The pressure will bleed down and cause the vehicle to cut out as you are experiencing.The first step I would suggest is to have the fuel pressure checked for the correct overall pressure and if the pressure is bleeding down.
Mike Kelly, Mechanic
Category: Lexus
Satisfied Customers: 5248
Experience: 17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.
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