OMAHA

took me about 3 times to start my car, wouldn't keep a idle. Then once it kept a idle, it revved up to 2000rpms and i had poor or no acceleration. It seems that it is burning LEAN now. It seems the car is in "limp home mode"..... it's at 250k and has not done this too me before.... bought the car at 200k. ANY IDEAS?

OMAHA

Traction control light came on also....it is OFF

OMAHA

I've also noticed the pipe between the manifold and catalytic converter is RED HOT!

Moarpower

Any rough idle before this? If the cat is red it is failing or has already melted

OMAHA

No rough idle before this happened..... ran great all day. A bad cat would cause this?

Moarpower

You will need to try pull the codes. A bad cat can cause all kinds of running issues, however a cat rarely just goes bad. There will be an underlying issue.

billydpowe

iTrader: (1)

it helps to know your year model??? your ECM could have leaking CAP's

OMAHA

1994 ls400

deanshark

Check the Air Flow Meter (AFM). They're know to go bad without warning. Try unplugging it to see if the idle goes back to normal. Mine did on my 93. Sometimes it doesn't throw a code to show it's bad. This thread shows the resistance it's supposed to be at. https://www.clublexus.com/forums/per...on-issues.html

OMAHA

Ok, i took it to o'reillys and they could not get any codes to register.... they suggested a clogged catalytic converter, but i digress..... getting it towed to a Lexus/Toyota specialist auto shop.

RA40

iTrader: (6)

The absence of codes has me suspecting the ECU. Lots of potential issues that interconnect so you'll have to step through and eliminate one by one, the ECU is worth the check to verify if there is leakage. Then onto the next one.

OMAHA

a leaky ecu was my strongest guess at this point....lol....i read cowboys post, miss ol cowboy!

RA40

iTrader: (6)

His helpful posts on the forum continue on. I was reviewing a much older thread but to comment on one of his reply's would be mute since he isn't active. In that time span we've learned different approaches to diagnose-fix. I mentally debate some threads in the FAQ for updates to reflect what we do now.

OMAHA

Found out today that the auto shop suggests starting with a rebuilt computer, $650 parts and labor. The Toyota/Lexus shop told me that no codes came up on the diagnostics. They think that is because the computer has gone bad.

OMAHA

I found a rebuilt computer $300 with core.....also, i found a 1993 LS400 at the junkyard, so would a computer from a '93 work on a '94 ?