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john -aka eauto
john -aka eauto, The Car Guy
Category: Lexus
Satisfied Customers: 16018
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: 1 year ago.
Category: Lexus
Customer: replied 1 year ago.
injectors pulse
Expert:  john -aka eauto replied 1 year ago.

does it have injector pulse?

Customer: replied 1 year ago.
Expert:  john -aka eauto replied 1 year ago.

spark? compression?

Customer: replied 1 year ago.
i have spark just drove from arkansas park car would not start i did not check compression
Customer: replied 1 year ago.
timing belt changed 50000 miles ago
Expert:  john -aka eauto replied 1 year ago.

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

Customer: replied 1 year ago.
sounds normal
Customer: replied 1 year ago.
does the lexus fuel pump prime at key turn
Expert:  john -aka eauto replied 1 year ago.

yes

Customer: replied 1 year ago.
i could not hear the pump when i turned the key but pump is pumping i checked line under the hood
Customer: replied 1 year ago.
i left the shop so i will check compression tomorrow what is next
Expert:  john -aka eauto replied 1 year ago.

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

Customer: replied 1 year ago.
ok i will check it and let you know will i just type here tomorrow
Expert:  john -aka eauto replied 1 year ago.

k

Customer: replied 1 year ago.
can i text you
Customer: replied 1 year ago.
if not i will type tomorrow
Customer: replied 1 year ago.
i will type tomorrow
Customer: replied 1 year ago.
i will check the compression
Expert:  john -aka eauto replied 1 year ago.

great

Customer: replied 1 year ago.
is there a run module on this vehicle
Expert:  john -aka eauto replied 1 year ago.

does it have compression?

Customer: replied 1 year ago.
164 above compression
Expert:  john -aka eauto replied 1 year ago.

so 164 on all cylinders?

Customer: replied 1 year ago.
Two cylinder at 168
Expert:  john -aka eauto replied 1 year 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 1 year ago.

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

Customer: replied 1 year ago.
looked at fuel receipt premium gas2.79 a gallon
Expert:  john -aka eauto replied 1 year 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 1 year 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 1 year ago.

are the injectors dumping?

Expert:  john -aka eauto replied 1 year ago.

is it over fueling?

Expert:  john -aka eauto replied 1 year ago.

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

Customer: replied 1 year ago.
Tried everything I think I might have to take it to Lexus ?
Customer: replied 1 year ago.
Not overfueling or contaminated took all fuel out of tank
Expert:  john -aka eauto replied 1 year ago.

are the injectors pushing fuel?

Customer: replied 1 year ago.
Customer: replied 1 year ago.
What would stop injectors from pushing fuel
Expert:  john -aka eauto replied 1 year ago.

being clogged..or lack of pulse