TREYFIGGS

I have a 1990 LS400 with about 220000 miles on it. Tune up probably three years ago. Just changed fuel filter and battery and charging system all perfect. No check engine light. Haven't checked codes because was told OBD 1 won't pop codes if no lights on. Okay there is the backstory here's the problem.

When under load can feel the car lunging through the brake pedal. Timing may be off, I don't know? When in neutral can't really tell anything. Besides RPM's lower than usually.

I am absolutely lost. I'm a Chevy guy..old Chevy...non computer. This is the wife's car, if it were not VERY sentimental to me this ****er would be on Craigslist. Please help me have a happy home life and get this fixed. Thank you in advance.

Trey

RA40

iTrader: (6)

Define "lunging through the brake pedal" ? When braking there is a pulsation? What specifically is the low RPM?

TREYFIGGS

Like it's fighting the brakes. Seems like it wants to go but then doesn't have the get up. Nothing on braking more on when stooped like at light. RPM's are about I'd say 500. Normally she runs at about 1000. Thank you so much for the help. GREATLY appreciated.

Trey

PureDrifter

iTrader: (10)

Sounds more like the rotors are warped than anything else...

TREYFIGGS

I know but is still sluggish

dicer

A way better description of what is going on would be sooooo helpful.

TREYFIGGS

I totally agree, however that's all I got for you right now. Sorry

RA40

iTrader: (6)

Could one or more of the brake calipers seized?

TREYFIGGS

Never thought of that. I'll check tomorrow. Today was pressure washing day lol. Thank you brother.
Trey

TREYFIGGS

Not the calipers. Just violently power like it was running out of gas. But then came back to life. No check engine light during it either

RA40

iTrader: (6)

For supplemental reading this thread:
https://www.clublexus.com/forums/ls-...capacitor.html

TREYFIGGS

Thank you bro. After reading I've figured out two things. One, that sounds right and two, I do not know how to solder so I'm buying an ecu.

Do you know how I figure the part number? There are two options.