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john -aka eauto
john -aka eauto, The Car Guy
Category: Lexus
Satisfied Customers: 15068
Experience:  15 years as a auto tech Ase Certified
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2002 lexus ls430 cranks but wont start fuel pump pressure at

Customer Question

2002 lexus ls430 cranks but wont start fuel pump pressure at tank 45psi and vehicle is firing
JA: Does the engine turn over? How old is the battery?
Customer: yes turn over battery 3 months old
JA: What is the model of your '02 Lexus?
Customer: ls430
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: check fuel pump and vehicle spark and injector pulse
JA: Anything else you think the mechanic should know?
Customer: no
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: 5 months ago.
Category: Lexus
Customer: replied 5 months ago.
injectors pulse
Expert:  john -aka eauto replied 5 months ago.

does it have injector pulse?

Customer: replied 5 months ago.
Expert:  john -aka eauto replied 5 months ago.

spark? compression?

Customer: replied 5 months ago.
i have spark just drove from arkansas park car would not start i did not check compression
Customer: replied 5 months ago.
timing belt changed 50000 miles ago
Expert:  john -aka eauto replied 5 months ago.

I'm thinking it jumped time or a tensioner failed I would check compression...does it sound normal when its cranking?

Customer: replied 5 months ago.
sounds normal
Customer: replied 5 months ago.
does the lexus fuel pump prime at key turn
Expert:  john -aka eauto replied 5 months ago.

yes

Customer: replied 5 months ago.
i could not hear the pump when i turned the key but pump is pumping i checked line under the hood
Customer: replied 5 months ago.
i left the shop so i will check compression tomorrow what is next
Expert:  john -aka eauto replied 5 months ago.

fire fuel and air...if it has fuel pressure and injector pulse it has to be a timing or compression issue

Customer: replied 5 months ago.
ok i will check it and let you know will i just type here tomorrow
Expert:  john -aka eauto replied 5 months ago.

k

Customer: replied 5 months ago.
can i text you
Customer: replied 5 months ago.
if not i will type tomorrow
Customer: replied 5 months ago.
i will type tomorrow
Customer: replied 5 months ago.
i will check the compression
Expert:  john -aka eauto replied 5 months ago.

great

Customer: replied 5 months ago.
is there a run module on this vehicle
Expert:  john -aka eauto replied 5 months ago.

does it have compression?

Customer: replied 5 months ago.
164 above compression
Expert:  john -aka eauto replied 5 months ago.

so 164 on all cylinders?

Customer: replied 5 months ago.
Two cylinder at 168
Expert:  john -aka eauto replied 5 months ago.

is there anyway that diesel fuel could have gotten in the system somehow because if you have compression spark and injector pulse it should start theoretically.

Expert:  john -aka eauto replied 5 months ago.

did you check all cylinders are they all within 10 %?

Customer: replied 5 months ago.
looked at fuel receipt premium gas2.79 a gallon
Expert:  john -aka eauto replied 5 months ago.

is there any way you can pull the injector rail to see that it is actually pushing fuel and not just pulsating. Also it there any way that fuel could have been contaminated either maliciously(like sugar in your tank) or the fuel you got at the station was bad? you can test for that by getting a fuel sample and either seeing particulates or smelling something

Customer: replied 5 months ago.
checked pressure at the fuel line coming off the rail to pressure regulator and motor woul lock if sugar contaminated pressure 48 pounds at rail combustion chamber has fuel in it
Expert:  john -aka eauto replied 5 months ago.

are the injectors dumping?

Expert:  john -aka eauto replied 5 months ago.

is it over fueling?

Expert:  john -aka eauto replied 5 months ago.

most contaminates wont make it past the injectors so it would be rare to see one lock

Customer: replied 5 months ago.
Tried everything I think I might have to take it to Lexus ?
Customer: replied 5 months ago.
Not overfueling or contaminated took all fuel out of tank
Expert:  john -aka eauto replied 5 months ago.

are the injectors pushing fuel?

Customer: replied 5 months ago.
Customer: replied 5 months ago.
What would stop injectors from pushing fuel
Expert:  john -aka eauto replied 5 months ago.

being clogged..or lack of pulse

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