1993 LS400 No spark/no start...Why I'm so confused... - Page 2 - Club Lexus Forums

1993 LS400 No spark/no start...Why I'm so confused...

Thread Tools Search this Thread
Old 06-25-14, 09:31 PM   #16
Lexus Champion
Join Date: Aug 2011
Location: Japan
Posts: 1,643
Thanks: 0
Thanked 6 Times in 5 Posts

I would check the fuel pressure first in a case like this. Or I would bypass the fuel pump resistor to see the difference. My guess is that the fuel pump is loosing its capability to send enough fuel to the fuel rail when heated up. An aged fuel pump tends to show that type of characteristic.

The fuel pump is cooled down by the fuel, but when the fuel flow is not enough, the generated heat is not dissipated well and the torque of the motor is dropped resulting less fuel to be sent. Too much accumulated heat triggers the Posistor to stop the motor to run for the safety and there comes no fuel to the rail.

ECU capacitors are almost the due for aged cars especially at warmer places, but your current problem is a bit different from the capacitor issue. Aged capacitors tend to show problems when cold, I must add.
Yamae is online now   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
pissed off agravated and confused gs300 wont start pakiman626 GS - 2nd Gen (1998-2005) 30 12-22-15 05:00 PM
Compression test bruin532 Performance & Maintenance 9 10-23-11 05:51 AM
92 Es300 Wont Start, Wiring? Jekruger72 ES - 1st to 4th Gen (1990-2006) 3 01-31-11 01:17 AM
HELP! Air Fow Meter Signal? NSeagle78 Performance & Maintenance 18 06-03-09 09:35 PM
please help i tried everything sc3boost Performance & Maintenance 9 04-10-04 08:54 PM

1993, 1996, 350, 400, crank, fuel, lexus, location, ls, ls400, sc430, sensor, spark, start, starting

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

All times are GMT -7. The time now is 02:50 AM.

Copyright © 2000-2016 Internet Brands, Inc. All Rights Reserved