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sprinkles08, ASE Certified Technician
Category: Lexus
Satisfied Customers: 23004
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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No getting power to throttle body, 98, Yes. Replaced

Customer Question

JA: What is the model/year of your Lexus?
Customer: No getting power to throttle body
JA: What year is your Lexus?
Customer: 98
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes. Replaced throttle body and fuel pump.
JA: How many miles are on the car? Is this the original fuel pump?
Customer: I replaced the fuel pump - not sure if it was the original. 255k
JA: Anything else you think the mechanic should know?
Customer: Starts up but cuts off almost immediately
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Lexus Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Lexus
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

There are quite a few things that could cause a start/die issue. You may have fuel or spark concern or the problem may be security related. You could have a bad cam or crank sensor causing a loss of spark or a loss of power or ground to the fuel pump.

The first step in diagnosing the problem is to use a code reader or scan tool to see if any fault codes are setting. Have you checked for codes?
What model is the vehicle and what engine do you have?

Customer: replied 1 year ago.
Code P1120. 98 Lexus gs300.
Expert:  sprinkles08 replied 1 year ago.

Did the problem start after any work was done, a jump start, etc?

Customer: replied 1 year ago.
No. The battery had recently been replaced though. The first thing noticed was that the car seemed like it was losing power/ wouldn't accelerate. It seems like it is not getting enough gas to keep the car running. I know it is not the alternator I had that checked. I've had the fuel pump and the throttle body replaced.
Expert:  sprinkles08 replied 1 year ago.

I'm a full time tech and at work this morning, I'll get back to you as quickly as I can!

Expert:  sprinkles08 replied 1 year ago.

I'm not showing P1120 to be a valid code for a 1998 GS300. Can you post the VIN?