impreza wrx classic sudden non start

[tobyholland]

hi guys, hope you can help

got home from xmas/new year holiday, and started the scooby perfectly, first time. M reg impreza wrx classic

next morning, she just cranks over - no fuelpump noise - hotwiring the fuelpump still gives no start, so i'm assuming no spark too ..

i checked all the fuses, the turbotimer & alarm/immobiliser are doing as they should [but i removed the turbotimer & hotwired the immobiliser in case], and still no fuelpump / startup.

any clues on the sudden overnight stoppage?

any other fuses lurking, aside from the driver's kick panel & under the bonnet [all present & correct!]

where is the ECU located, in case that's jacked it in?

just off to try an ECU reset, then kick its ar*e if it doesn't start

let me know

cheers

Toby

[spongy]

may be maf bud,disconnect maf wires and try that,if she fires thats your problem
cheers
toni

[tobyholland]

is there perhaps an inertia switch that might have got tripped?

[tobyholland]

spongy said:

may be maf bud,disconnect maf wires and try that,if she fires thats your problem
cheers
toni

hello toni,
does the MAF have any impact on whether the fuelpump runs or not? [not, in my case as detailed!]

[spongy]

All i can say bud is i had a 99 uk with a 2.5 sti lump in it,washed it one sunday and then had same prob as you.Not saying it is defo this but its a start.Bud i spent 4 weeks getting car running and could not believe the cure was so simple.Just unplug and try i know the uk 99 is a different maf but same end result.next try fuel pump relay.

[spongy]

PS bud
pump primes system on start up,if you hot wire this may flood engine,so no spark.

[ScoobieWRX]

Try the crank position sensor. If that's faulty it won't start at all and give symptoms similar to what you're describing.

It sounds like you haven't checked to see if there are any error codes coming up either. I would do that first otherwise you're just fumbling in the dark.

[Hol]

ScoobieWRX said:

Try the crank position sensor. If that's faulty it won't start at all and give symptoms similar to what you're describing.

It sounds like you haven't checked to see if there are any error codes coming up either. I would do that first otherwise you're just fumbling in the dark.

I agree.

You can connect two bacl wires together under the steering column and your check engine light will flash to tell you what is wrong with it.

You can then check the code to see what part is at fault.

Do a search on Scoobynet.com for some pictures and list of all the codes.

[Hol]

ScoobieWRX said:

Try the crank position sensor. If that's faulty it won't start at all and give symptoms similar to what you're describing.

It sounds like you haven't checked to see if there are any error codes coming up either. I would do that first otherwise you're just fumbling in the dark.

I agree.

You can connect two bacl wires together under the steering column and your check engine light will flash to tell you what is wrong with it.

You can then check the code to see what part is at fault.

Do a search on Scoobynet.com for some pictures and list of all the codes.

[spongy]

Dont think you can connect wires on m plate to old,think this option was on later models.Pump will run if crank sensor is not working

[ScoobieWRX]

spongy said:

Dont think you can connect wires on m plate to old,think this option was on later models.Pump will run if crank sensor is not working

M Reg = 1994 (V1/2) It has a set of green connectors and black connectors for error code reading and resetting the ECU.

Edited by ScoobieWRX on Wednesday 26th January 23:51

[MMTWRX]

Yes you can, I've just sold my m reg WRX and just prior to selling it had an issue with the coolant temp sensor. Look up under the steering column by your left knee and you will see two green and two black plugs. If they haven't been used before, mine hadn't, they maybe taped up and difficult to find. I will add a link to a site that will talk you through how to test.
I think if the crank sensor is faulty you get problems starting only when the engine is hot.

Link: look for ecu diagnostics.
http://www.saxonfields.freeserve.co.uk/default.htm

Edited by MMTWRX on Wednesday 26th January 23:53

Edited by MMTWRX on Wednesday 26th January 23:57

[ScoobieWRX]

If the crank sensor stops working it can cause a whole multidtude of issues from poor acceleration and fuel surge to complete non starter.

For all the OP knows it could be his aftermarket alarm/immobiliser. If he's ruled that out then he's got to check for error codes. If there are no error codes and it still won't start then it could even be a bricked ECU. It happens.

If the OP gets really stuck and he needs to rule out the ECU i've got a spare V1/2 ECU he can swap to just to rule that out.

[MMTWRX]

The ecu is under the passenger side footwell under a kickplate, probably a Z4 ecu.

[ScoobieWRX]

There are a number of ECUs it could be with the 260bhp Z4 being the least common of the 4 plug V1/2 ECUs.

Any of the 4plug ECUs from 1992-1996 will get him going with the main differences between ECUs being the amount of factory mapped boost, timing and fuelling.

[Hol]

ScoobieWRX said:

If the crank sensor stops working it can cause a whole multidtude of issues

Thats made me remember whe my car cut out for no reason whatsoever once.

Luckily I had an in dash gizmo called a SECs monitor (MY99 onward im afraid), that could read the codes and this diagonsed a crank sensor.

When I looked it was actually unplugged.
Garages normally do this when servicing the car, so they can crank it over without igntion whilst primining the oil pump. In my case they hadn't plugged it fully back in and it fell off a couple of days later after about 100miles of driving.

Its something else thats worth a look.

[MMTWRX]

ScoobieWRX said:

There are a number of ECUs it could be with the 260bhp Z4 being the least common of the 4 plug V1/2 ECUs.

Any of the 4plug ECUs from 1992-1996 will get him going with the main differences between ECUs being the amount of factory mapped boost, timing and fuelling.

If its a 95 M, I'll have a Jaffa cake on it being a Z4.