lexdud

Hello all,

I previously posted here:

https://www.clublexus.com/forums/per...ng-issues.html

... about my sick SC400. On startup it will stall immediately unless you press on the gas. Keeping the gas pedal depressed (to keep it running) results in a unpleasant chemical smell coming from the tail pipes. After inspecting/cleaning my IACV and verifying MAF functionality using my meter I am left with a car that actually runs worse than before I started. A friendly forum member suggested I read any error codes and forwared this link to do it:

http://www.troublecodes.net/Lexus/

I did this last night and am a little perplexed. Instead of getting a code via the blinking CEL I got a contiuously blinking CEL with a continuosly blinking O?D indicator. My question is ... is this normal for not having any codes or is my ECU fried?


Thanks ...

Gspec

Continuous flashing on OBD1 car usually means either a) no codes present or b) bad ecu

Before I worried to much about it, I'd pull your EFI fuse and clear all the codes, then wait for the light to come on again and rejumper the terminals and see if it will flash an actual codes..

edit..going back and rading your original thread, I'd suggest searching for air leaks post MAF....could be anything from a cracked intake boot, to a leaking intake manifold gasket to a dry rotted vacuum line thats letting unmetered air into the engine.

lexdud

Thank you for your input. I pulled the lower-end of the air intake completely out this weekend including the filter box, MAF assy and the hose that connects it to the throttle body. I tried starting it both times and got the same result each time ... no matter if the MAF is there or not.

lexsc4oo

iTrader: (1)

Def check for a vacuum line that is cracked or somthing of that sort that is post MAF. also check your Catalytic conv. im gettin a feelin you might have a plugged/bad cat. run the car for a little bit and get it warm and look under at your car if it is glowing or has any red hot spots then thats the problem.

lexdud

Thanks I had never thought of that Would that be a possibility on a car with on 52K miles on it?

jcv4773

I don't have a solution for you but I have a 94 SC400 that seems to have developed the same issue as you are reporting. The dealership has already replaced the IACV twice and I just replace the MAF. My car's symptoms go away after restarting the car repeatedly. I'm perplexed and searching for a solution.

CRuby

iTrader: (1)

Resurrecting this thread as I have a '92 SC400 with 178K miles and similar startup/stalling problem. Check engine light is on & I tried to read codes by jumping between E1 & TE1 via diagnostic port under dash, left side. Check engine light just blinks continuously, no pausing to indicate next digit. The above threads suggest pulling EFI fuse to clear codes & check again...but where is the EFI fuse located?
Does disconnecting the neg battery cable serve the same purpose?
Did Lexdud ever get this problem fixed, & if so what was the cause?

I've been hopping from one problem to the next on this car, but am determined to keep fixing whatever I can, & CL site has been a great source for info. Thanks.

BartleDoo

iTrader: (1)

If you open the underhood fusebox the lid will have a layout that defines each fuse's purpose. One will say efi, but pulling the negative terminal will work as well.