Re: fault codes

[Nathan Belo <belo@eskimo.com>]

On Fri, 26 Jul 1996, LEMONHEAD wrote:

> My 90 is periodically giving me the "check engine" light.  It only seems to come on 
> during periods of extend idling AND only when the engine is fairly warm; gauge reads 
> slightly over halfway to "H".  When the light comes on, it will go away after a  
> minute or two of normal driving; i.e., once I get out of traffic.  
> 
> When I try to dump the codes, the engine dies; that is, I insert a fuse into the top 
> of the fuel pump relay, remove it after 4 seconds and the engine slightly revs up a 
> bit and then dies.  I can't read the codes if the engine dies.  I was able to 
> replicate this every time I tried to read the fault codes.
> 
> Anyone else ever seen this?  Engine runs great; there is sometimes a slight miss at 
> idle however.  
> 
> Chris
> 1988 90 with fresh plugs, wires, cap, rotor, air filter, O2 sensor, clean ISV, 	
> 	crankcase breather update, all vacuum leaks fixed, and a sump 
> 	full of fresh Mobil 1.  Soon to replace: fuel pressure regulator and 
> 	filter...and (sigh) more than likely the fuel pump as it is starting
> 	to make some strange buzzing sounds every once in a while...
> 
When you figure it out let me know.  I have the same problem.  It
happened before I got the car tuned up.  I need to order the tune up parts
and I hope it should work things out.  Ned at Intended Acceleration said
there are about 20 reasons why the check enging light comes on.  

Nathan Belo
'88 90Q