Miss in 87 Subaru RX

[Scott Schaaf]

I have heard that in some GM trucks, if the speed sensor is
disconnected,  the fuel mixture will go REAL rich.  I don't think that
it could go rich enough to kill the car,  but then again,,, who knows
for SURE!

  May want to take a good look at the speed sensor!

					Good Luck,
						Scott....


Benjamin Marsh wrote:
> 
> I have an 1987 subaru RX with the mpfi turbo engine.
> The problem occurs when the engine is at normal operating
> temperature but not always - driving along at moderate
> loads and higher the car sometimes misses, backing off
> doesn't fix the problem and the car eventually rolls to
> a stop. If I wait until the car cools down sufficiently
> it goes again just fine - until it heats up. There is also
> a fair amount of fuel smoke associated with the car stopping
> which leads me to believe it is an ignition problem.
> 
> Over the past 6 months this has happened three times.
> 1st I replaced the O2 sensor - problem went away.
> 2nd I replaced the O2 sensor - problem went away, until
> that evening when it happened again - I replaced spark plugs
> and again problem went away, that was about 6 weeks ago
> now it has happened again...
> 
> I have a computer fault code of 33 which corresponds to
> a speed sensor malfunction, no other fault codes show up
> the SS fault shows up all the time, when the car misses though
> the ECS light flashes on and off - the speed sensor is still the
> only fault code shown. Last time it happened I had a boost gauge
> in the car which showed that during the miss I was getting full
> boost at full throttle even though the tach was showing at below
> 1000rpm this indicates I am still getting fuel into the engine
> which is going through into the exhaust and spooling the turbo.
> 
> Does anybody have any idea what could possibly be causing this?
> 
> BTW my local Subaru dealer has no idea - he says he has less
> of an idea than I do due to not having seen one of these cars
> before I brought it to him...
> 
> Thank you for your help
> 
> Ben Marsh