connor93wrx

Wonder if anyone can help i have a 1993 wrx import. on tuesday night i was driving along and the check engine light came on, now when it goes to boost up i throws you through the window screen, it just wont let it boost up runs fine when not on boost. any ideas people.

codfather

iTrader: (1)

sounds like your over boosting causing fuel cut. do you have any mods on ur turbo, like a boost controller or bleed valve?

dan83590

Limp Mode? Reset your ECU.

Shmerman

iTrader: (14)

Sound more like fuel cut to me.......limp mode just set you limiter at around 4000rpm iirc. This wouldnt give you the "throught the windscreen" feel that fuel cut would. It is caused by overboost. Could be a number of things. If you have recently added any engine/exhaust mods without a remap this would most likely be the place to look.....otherwise its give the boost solenoid and pipes a clean.

connor93wrx

got a k&n, straight tru exhaust, and bailey dump valve but all these have bin on for bout 6 months

Fuzz

Before you reset the ECU actually read the codes off the check engine light.
Might give you a clue.

To check the codes, connect the two black plugs together under the dash and count the flashes that the check engine light shows.
i.e 4 long flashes, then 2 quick flashes means code 42.
Also note there may be more than one set of codes in the memory so keep counting.
Pain in the *** when there are five stored codes, all gets a bit confusing.

Hitting the windscreen feeling is almost definitely fuel cut due to overboost.
Check the small pipes from the turbo and actuator back to the boost solenoid for splits / cracks etc.
Check the operation of the solenoid by connecting the two greeen plugs under the dash.. you should hear the fans cut in and out and the boost solenoid should be clicking away like mad as well.

Andy

Andy

codfather

iTrader: (1)

Have you run the check engine light code..to see which sensor is throwing up ur check engine light? could be ur maf, but might not be related to you getting thrown through your windowscreen..
Do you have a boost guage? and if so what boost are/were you running at?

connor93wrx

how wud i do that?

connor93wrx

got a boost gauge not changed it from when i got it its runnin about 0.8 bar not even a bar

codfather

iTrader: (1)

http://www.enduringsolutions.co.uk/troubleshoot/
This link will show you how to run diagnostics on ur check engine light codes.
give it a whirl.

connor93wrx

cheers people ill see wat it bring up tomoro andy cheers for that

connor93wrx

cheers people was gettin a bit fed up with it, at least i got a few things to try tomoro cheers andy

dan83590

Turn OFF the ignition

Connect Error code Connectors and Test Mode Connectors :
2 black connectors under dash, connect black to black and 2 green connectors under dash, connect green to green, they are by your left knee when sat in the drivers seat and often taped back to the loom if they haven't been used before.

Turn ON ignition but don't start the engine

Engine Check lamp comes on

Press accelerator pedal to the floor

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

Release foot off the pedal completely

Start the engine

Check engine light error code is indicated by Pulsing lamp

If an error is detected then Check the ECU Code

If no error is detected - drive the car sensible for a couple of minutes
i.e. until warm (do not use boost or high rpm!)

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

An Error Code is indicated by a flashing check engine light
of varying length of flash,
a flash of around once a second is the okay code and indicates all is well.

If an error code is detected Check the ECU Code

Turn ignition OFF and Disconnect Connectors

If there is a fault Check the Appropriate Sensor



Error Codes
An Error code is defined as a slow flash followed by fast flash
i.e 2 slow and 3 fast = 23 Mass Airflow sensor.
A continuous on/off at the same speed is no fault found.


Code Fault
11 Crankshaft position sensor

12 Starter switch

13 Camshaft position sensor

21 Engine coolant temperature sensor

22 Knock sensor

23 Mass air flow sensor

24 Idle air control solenoid

31 Throttle position sensor

32 Oxygen sensor

33 Vehicle speed sensor 2

35 Purge control solenoid valve

42 Idle switch

44 Wastegate control solenoid valve

45 Pressure sensor / Pressure exchange solenoid valve

51 Neutral position switch

dan83590

It can be a bit tricky to find the connecters if they haven't been used before but they are there...

connor93wrx

hello people got me check engine codes i got, 31=throttle postion sensor, 33=vehicle speed sensor and 44=wastegate control solenoid valve. i take it i just need to replace these parts? you were right the black connectors were a pain in the a**e to find couldnt even find the green ones.

Scott.T

iTrader: (2)

you need to find the green ones to clear the faults. then do the diagnostics reset procedure decribed above. if this doesn't flag anything then do nothing.....

keep driving/using the car until you get the mentioned problem, then connect the black connectors and read the codes.

the codes you have may of been in the ECU since it was last powered/battery last connected, and these can be logged even by disconnecting one of the sensors during servicing or maintenance.

Fuzz

Yep as above, now you have a list of all stored codes you need to reset and see what the CURRENT codes are..
That'll narrow down what you need to look at.

connor93wrx

how do i reset the codes?

connor93wrx

are the green ones block connectors or bullet connectors

connor93wrx

i found the green connectors and reset the codes, i went for a drive until the light came on again, i got check engine codes 44=wastegate control solenoid valve, 24=idle air control solenoid, 31=throttle postion sensor and 33=vehicle speed sensor. any ideas gettin confused now i have one more code than i did before.

connor93wrx

hello people just to say thanks for ur help, i reset the ecu cleared all the codes and its been as good as gold since went to the posers cruise tonight drove round all night and not a hick up lets hope it stays that way.
cheers fellas