paul39

iTrader: (11)

How do you check if your injectors are working as they should be the reason i ask is i bought a wrx wagon two weeks ago with the cam belt snaped the guy said it had hit the valves on no1 cylinder ? change the belt sems like its running three cylinders so did a compresion test was abit low on one cylinder so changed the head but its still runs ruff if you pull the injector off doesent make any differance..

paul39

iTrader: (11)

STI_Baly

iTrader: (23)

Might sound like a joke, but give the injector cap (the injector cover which secures it to the fuel rail) a smack with a spanner (Make sure the injector is fully installed). Sometimes after lack of use they sieze up, always works for me.

The snapping belt would not have had any detremental affects on the injectors themselves mate.

STI_Baly

iTrader: (23)

Whats the compression like now???? and all the hoses installed and checked? and you have completely bled any air from the coolant system?

paul39

iTrader: (11)

i havent done a compression test yet was getting dark would not having any water in make it run ruff as i only run it for 30 sec to test

STI_Baly

iTrader: (23)

Yes it will run very ruff without water as the Coolant sensor transmits back to the ECU on these the temp gauge sensor is independent and sits next to the coolant sensor on the crossover pipe (The coolant sensor is the brown sensor on the water crossover pipe which carries water from one side of the block to the other under the inlet manifold)

I would definitely run a compression test on it though mate as soon as possible.

paul39

iTrader: (11)

ok will do was abit of a challange to do the heads in the car but got there in the end would the pistons have hit the valves

STI_Baly

iTrader: (23)

Well you see this is the thing, the subaru engine is a non-interference engine (i.e. valves and pistons) therefore it shouldn't have. What were the issues with the head? did you have a look? It should be noted that the inlet and exhaust valves can touch and bend themselves on collision with each other.

I mean if the car was timed incorrectly then there is a possibility of there being interference and the piston being damaged. The same will apply if the heads or block have been skimmed and the correct Head Gasket not installed.

paul39

iTrader: (11)

when i got them off they looked ok was only when i put some petrol on the valve it went strait through but only on one side think its no1 cylinder

STI_Baly

iTrader: (23)

And what did you do to correct it Paul?

paul39

iTrader: (11)

i changed both heads

STI_Baly

iTrader: (23)

I sympathise with you mate, as i gather you did this with the engine in place. Certainly not the easiest of tasks.

paul39

iTrader: (11)

aaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhh allday and it still the same...could i have got the timing wrong i v aligned all the marks as per manual but still chuggs its like its running on two cylinders did a compretion test again today is 140psi is this good or bad

paul39

iTrader: (11)

bttt

dazdavies

iTrader: (22)

Have you swapped the injectors from the good cylinders to the bad?

That would then rule out problems with the injectors.

paul39

iTrader: (11)

All fixed now there was something wrong with the head think it was the inlet valves on no 1 piston but all so had two broken wires to the coil packs 1 and 3 so in the end there was nothing wrong with the injectors