92Lex

BMW

here: http://us.lexusownersclub.com/forums/index.php?showforum=14

When did the lights appear? Was any work performed prior to these malfunctions appearing? Have you had any suspension work done?

Intake gasket

Hi Guys/ Gals,

I am new to the forum but had a quick question. I recently failed my smog test with my 1991 Lexus LS400 due to a malfunctioning check engine light. I think it may either be a short somewhere in my car or the check engine light bulb is out. Does anyone know how to check the bulb without ripping out my dash? Also if i have to rip out my dash how hard is it?

Thanks,

Nick

Did it fail for the light not illuminating with KOEO (Key On, Engine Off) or because the light is always illuminated?

If the light is always on: pull codes, determine malfunction, repair/replace

No light on KOEO: remove cluster, inspect bulb (if the bulb checks out okay: check electrical circuits)

Asian Cuisine

Karate

Thong

Does it occur all the time? Any engine cooling issues? Does the heater work properly?

Can you take a picture of the suspected leak and post it?

Benjamin Franklin

Fast food

s*x, french coffee, and a cigarette. Bad habits but it works for me, though.

Prescription

What about it?

Rump roast

Is the front crank seal also leaking? Has your mechanic checked the PCV system?

White-out

An EGR valve that is stuck partially open will cause poor idle/acceleration. If the EGR diaphragm is ripped, or the car has a defective modulator, then you probably wouldn't notice any driveability issues.

Your mechanic is "missing something", not you. What is he/she replacing this time? How far was the seal driven in? Is the bottom end balanced?

Factory

Haircut

It would be a waste to have goals of only 400 whp, with that turbo. That turbo only shines at 17+ psi.

Retarded timing actually reduces NOx.

Stalker

You can't use NOx as a determining factor for fuel control. If it were a true "lean condition", then the CO level would be at 0.00 and O2 % would of been higher than 0.08.

93ls400walt,

Test the EGR system. Let me know the outcome.