over boosting!
12 March 2002, 01:12 PM
#1
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my scooby is over boosting,it is hitting 1.3 bar and the fuel cut out is activating.
tried to adjust the actuator down but it is already wownd right out
it is a 94 wrx ,i understand it can run up to 1 bar before the fuel cut off but how can i lower it?
could it be a faulty solinoid or am i barking up the wrong tree
help!
tried to adjust the actuator down but it is already wownd right out
it is a 94 wrx ,i understand it can run up to 1 bar before the fuel cut off but how can i lower it?
could it be a faulty solinoid or am i barking up the wrong tree
help!
12 March 2002, 01:54 PM
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Try fitting a hose from the wastegate actuator direct to the turbo housing pressure takeoff (bypassing the boost control solenoid). The boost pressure should run at 0.5bar approx. This checks out the wastegate mechanism and the actuator diaphragm, proving the problem is electronic/solenoid control.
If the boost cut is still occuring then you have a mechanical problem with wastegate/actuator.
If the boost cut is still occuring then you have a mechanical problem with wastegate/actuator.
12 March 2002, 03:35 PM
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Definately the ECU/solenoid control then.
Start with the boost control solenoid. Check its got 12v supply and that all hoses are in place and not leaking. If no 12v, check the wiring back to ECU. If 12v supply ok then try changing valve or checking flow through the valve with and without the 12v applied.
If this all appears to be ok you should try changing the MAP sensor and then the pressure exchange solenoid (small brown valve on top of MAP sensor/ignition amplifier bracket).
Start with the boost control solenoid. Check its got 12v supply and that all hoses are in place and not leaking. If no 12v, check the wiring back to ECU. If 12v supply ok then try changing valve or checking flow through the valve with and without the 12v applied.
If this all appears to be ok you should try changing the MAP sensor and then the pressure exchange solenoid (small brown valve on top of MAP sensor/ignition amplifier bracket).
12 March 2002, 03:53 PM
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You can sqirt brake cleaner through the solenoid to clean it - oil could have got in and it is stuck open. If it is open you can blow through it and feel it at the other end. Replacements are about £30 from breakers if it is dodgy. It runs a 12V common supply and low side drive from the ECU (ie 0V = solenoid open) at least on MY99/00.
12 March 2002, 10:54 PM
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thanks guys,job sorted!
now running a healthy 0.9 bar with no problems
YIPPIE!!!!!!!!!!
the solenoid was clogged with oil,give it a good clean out and hey presto working fine
thanks again guys
now running a healthy 0.9 bar with no problems
YIPPIE!!!!!!!!!!
the solenoid was clogged with oil,give it a good clean out and hey presto working fine
thanks again guys
13 March 2002, 11:32 PM
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help i have the same problem and i dont know what valves and solanoids you are all on about so cleaned all the little gizmoes by the air box with brake cleaner and still the same and get ing wours every day
help me please olly
help me please olly
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