nothing from injector number 4 and 2 ???

[kingwick]

hi problems as usual
my ph2 172 is only running on 2 cylinders have replaced coil plugs and pre cat lambda.
injector number 4 an number 2 are not working. removed injectors and changed with the working cylinders but problem did not move. this rules out the actual injectors so must be electrical ?? this is where i run out of ideas all help is very much appreciated.
also my car is off the road so cant leave it in any where and dont have a diaognostic computer

 

[mr.pink87]

check the loom for damage!? check if there is voltage on the plugs.

 

[kingwick]

did check all wiring for damage but cant see any. also tried to check voltage at the injector plug number 2 is getting about 1.5 v cant check number 1 because as soon as i take plug off it stalls so cant really check. would there be seperate fuse for 2 and 4 and another fuse for 1 and 3 ?? cant see any blown fuses.

 

[mr.pink87]

they don´t have separate fuses. don´t take the plug off for checking the voltage. you need to measure the voltage with some pins from the backside of the plug.

 

[kingwick]

ok thats great thanks ill check that tomorrow.what sort of voltage should i be hoping for ? and what could be the outcome ?
many thanks

 

[mr.pink87]

12 volt with ignition switched on. and fluctuating between just above 0 and 12 volts when idling. i guess you don´t have a scope?

 

[kingwick]

no sorry no scope. just a test light and a cheap multi meter.

 

[mr.pink87]

if you need a wiring diagram, search the forum for the workshop manual. the injectors are getting 12v from the ignition feed and are switched to mass by the ecu.

 

[kingwick]

tried to test this today but now the car wont start at all it cranks for 3 secs the cuts out completly. i think im gonna cry. also when ignition is switched on there is a loud buzzing noise coming from the throttle body and i noticed some oil coming from the butterfly part ??? is this common

 

[kingwick]

got the car started and running on 2 cylinders again bad engine earth was that prob. now it just a case of getting the other 2 injectors working. cleaned the tdc sensor also but made no difference.

 

[mr.pink87]

Did you check the plug from the loom on the ECU for damage? Maybe got water in there!?

 

[MicKPM]

As above you need to confirm the injectors are all getting a good +12v. If they are you need to check the control lines that hte ECM uses to earth them out. Normally, this is where a scope comes in but failing that you can continuity test the lines from each injector back to the ECM. I'm willing to be there's a break somewhere... possibly the connector itself

Mick

 

[mr.pink87]

worst case would be a fucked ECU...