check engine light

[Chris Lemon <br00206@binghamton.edu>]

Anyone have any ideas on this one...I've almost reached the end of my rope
of  knowledge...but would like very much to solve this...

I keep getting the infamous "check" warning in my 90 (115k)...and I'm
getting real tired of it!  Here's why:

I dump the codes and I get a fault for the ECU temp sensor.  I check the
sensor resistance and harness voltage and both seem fine.  The fault was
intermittent so I figured that maybe the sensor was going out in spurts.
Linda could get me one for cheap so I ordered.

I replaced the sensor, along w/ thermostat (which, BTW, you *can* do w/o
removing the P/S pump), and the fault is still there.  Now it seems to only
be present sporadically when the engine is warm (1/2 way on gauge) and
sometimes when I'm driving (i.e., throttle open).  I cannot, however,
replicate this every time; sometimes the lamp will light while idling and go
away once I get moving again...

I'm thinking that when it lights while I've got my foot into it that the ECU
is giving me a knock warning (...but I ONLY use 93 octane gas) and retarding
the timing.  If I back my foot off the pedal the light will go away and come
back when I put my foot back on it...*sometimes*.  Like I said...there is no
solid pattern here as to when I can get the lamp to light.  When I dump the
codes, however, I *still* and *only* get the code for ECU temp sensor, even
though the sensor and harness check out.

This sucks!  I'm getting sick of looking at this thing blink...and my
friends asking me what's wrong with my car...

Could the knock sensor be picking up the slight exhaust leak that my car
has??  Any ideas on any of this??

==========================================    
Chris Lemon          
br00206@binghamton.edu         
http://www.geocities.com/CollegePark/1710/  
==========================================