blocked injector maybe?????

[big gra]

right, ive stripped the head off the engine, again, to fing that no3 cylinder is clean and has no trace of even attempting to fire, could this be a blocked injector? whats the best way to clean them.

as you can see no3 is clean and no is black.

http://i57.photobucket.com/albums/g201/biggra/02052008017.jpg

[craig green]

It could be, though I'd expect the spray pattern would go poor before the injector goes kaputt.

Try a spare it wouldnt hurt. Deffo got spark on that plug?

[rysmee]

hey.. i dont know the history behind this but i'massuming you had compression on that cylinder? If all is ok with that then its either a spark problem or as you suspect an injector. first off check your getting feed to the injector wiring by plugging in a noid light. this should flashvery quickly to show the ecu is sending the pulse to the injector. if this is ok then to eliminate the injector you could try either a substitute one or swap them from one cyl to another.. then if no3 starts working and say no 4 stops firing, then you know the injector is at fault.
If this fails, and most likely it will be a spark problem. I'm assuming the engine is a dizzy version so check cap and leads. Again you can eliminate leads by swapping them round (making sure firing order stays same obviously!)and seeing what cyl's stop firing. Its just a process of elimination that will lead you to your fault really. hope thats helps

[pul16v]

cant swap injector wirein to differnt cylinders because its sequetial (sp)

[Lee]

cant swap injector wirein to differnt cylinders because its sequetial (sp)

He means swap the injector itself, not the wiring ;)

I agree this is the best bet to find the issue, when youve swapped the injectors over, yank the plug lead off each plug to find which cylinder is dead. Same cylinder = spark problem, different cylinder = inj.

[big gra]

cheers guys, will have a try and let you know results tomorrow. the engine is a 1.6 gte gsi, which other injectors will fit if i need to replace or source a spare?

[meritlover]

have you actually checked that cylinder is firing with a timing light?
if compression is fine and it IS sparking it must be fuel.
as said, swap injector for (say) inj 1 and see if the problem moves, also check all wiring and the connectors are clean.
is the plug wet or dry when you remove it? it kinda looks like its been washed clean. when you 'could' connect up the fuel rail, turn on the ign and spin the distributor with your hand and aim the head away from your face. watch the spray pattern and check all 4 work.

they should all click when they fire. ive heard you can sometimes release them with a few smart 'taps' with a hammer. but never had to go this.

[big gra]

chhers for the advice, gonna get some breakfast and crack on.

[Adam]

Breakfast?
Its 12.35pm

lol

[big gra]

im giving up, gonna put it on ebay as a non running project, tried everything now, ive got a feeling it needs new injectors but i can even spare a fiver so thats not gonna happen.

[meritlover]

youve tried everything we have suggested and you cant find out if its a stuck injector or not?
hmmmmmm:roll:

[big gra]

ive tried everything and it still wont go, ive stripped the head, cleaned the enjectors, tested to see if there is signal getting to tehm, and still the engine is the same as it was. wanted to have this reday for pv but because of time and money its not gonna happen, gonna sell and buy a nova thats in one piece running, taxed and tested and get that raedy for pv.

[meritlover]

but are the injectors actually squirting, and have you swapped them over to see if the fault moved? have you tried checking if there is deffinately a spark on no.3? and what is the compression? there cant be much wrong with it.

[big gra]

but are the injectors actually squirting, and have you swapped them over to see if the fault moved? have you tried checking if there is deffinately a spark on no.3? and what is the compression? there cant be much wrong with it.

cleaned the injectors out and they are all working, swapped no3 and no4 to be sure and its fine.

[meritlover]

so, its getting fuel, spark at the right time, good compression and its STILL not running????

have you got the firing order right on the distributor?

[AlexW]

Saw it on ebay, youve put too much work into to just give up IMO

[meritlover]

i fail to believe theres much wrong with it from what youve described so far anyway.

[Adam]

You can't clean injectors without specialist equipment(they have to be constantly pulsed and a cleaning fluid forced through them)

[meritlover]

ye, a bare minimum of a 12v supply and afternoon in the ultrasonic bath.

[Mike]

^ your local jeweller should have an ultra sonic tank (used for cleaning watch movement parts) and they should also have undiluted amonia aswell.

Put two and two together and you'll have clean injectors (Can tell some here has a Hirology Degree :thumb:)

[big gra]

well i checked and before i put the head back on and they were all squirting and all getting spark. ive spent so much money on this engine now that ive none left for the bodywork etc, plus my phones just gone fooked again so gota pay for that today aswel. went to look at another nova last nyt, and for the price i will pay doing the bodywork on mine, i could have a running nova, taxed and tested.

[meritlover]

^ your local jeweller should have an ultra sonic tank (used for cleaning watch movement parts) and they should also have undiluted amonia aswell.

Put two and two together and you'll have clean injectors (Can tell some here has a Hirology Degree :thumb:)

that is what i do. but i have own heated ultrasonic bath and cleaning spirit.(ammonia smells too much like horse p;ss for my nose) i like to hold them open with 12v so they clean the pintle valve as well.not as good as the ASNU but it is the cheapness that meritlover can afford. it is also a very nice for cleaning out nova tappets to make them work nice and fresh, and also piston ring-lands. it is good to have a nice nova engine. a real pleasure.

[mulletor]

your crazy man. i have never seen an injector fault on a vauxhall.
sounds like the leads are the wrong way round or arcing out somewhere.

[meritlover]

injectors arnt polarity concious, and injector faults are no more or less common on a vauxhall as they are on any car, as theyre usually either bosch or denso.

and stop digging up old posts! lol

[big gra]

haha well injectors have gone on me before and caused havoc trying to figure them out. engines in and running sweet now anyhow!!

[rysmee]

so what was it in the end or will we never know?!!