lads,

I have a 1994 JDM WRX auto which has been running fine. Last night the boost dropped from 0.95 (its standard) down to 0.5. No warning lights or anything else, just a noticeable drop in power. Have a boost guage fitted and dump valve. No other mods, no engine check light on either.

Would appreciate any places to start looking!!!

Cheers

 

i would check all small hoses (from turbo to solenoid and maniford) are connected and do not have any splits in.

 

Probably boost control soelnoid jammed shut or faulty.
If you do a ECU diagnostic/reset test it may bring up a Error Code.

 

Excuse my ignorance, bu how do you do a ECU diagnostic test ?

 

ECU Diagnostics
The ECU can diagnose any fault that may arise due to abnormal signals that are sent to the controller. The ECU Check Engine will illuminate in the instrument console if there is a problem with any of the computers inputs. It is possible to find which sensor(s) is faulty by following these steps:

Turn ignition OFF

Connect read memory connectors
[2 black connectors under steering column]

Turn ignition ON (Engine OFF)

Engine Check lamp turns on

Code is indicated by Pulsing lamp

If Code is OK then Turn ignition OFF & Disconnect Connectors

Check ECU Code

Turn ignition OFF & Disconnect Connectors

If there is a fault Check Appropriate Sensor

ECU Reset
On early MYs (especially pre MY97) the ECU retards the ignition when knock is detected, however, it is very slow to advance the timing again. An ECU reset will restore the car to factory default settings. This will remove any stored fault codes and restore ignition advance. It is possible to reset the ECU by following these steps:

Turn ignition OFF

Connect Read Memory Connectors & Test Mode Connectors
[2 black connectors under steering column] – [2 green connectors under steering column]

Turn ignition ON (engine off)

Engine Check lamp turns on

Depress accelerator pedal completely

Then return it to the half-throttle position and hold it there for two seconds

Release pedal completely

Start engine

Code is indicated by Pulsing lamp

If a fault is detected - Check ECU Code

If no fault is detected - drive the car sensible for a couple of minutes
i.e. until warm (do not run tall & do not thrash it!)

When the ECU has been reset the Check Engine Light will flash

Code is indicated by Pulsing lamp

If a fault is detected Check ECU Code

Turn ignition OFF & Disconnect Connectors

If there is a fault Check Appropriate Sensor

 

Thanks Scott,
I'll have a play at the weekend.

Andy

 

Cheers lads, will have a good check of it now, fingers crossed eh!!!!

 

MAYBE THE SMELL OF PORK HAS FECKED THE ECU!!!

GRUNT GRUNT !!!! POT BELLY!!!