issing noise

[daz the plumber]

ive had a issing noise from the plenum area for a while,i just moved the injector one quarter of a turn, its stopped making the noise,i could not see a fuel leak , can they suck air in , am i better just leaving it alone or does it need removing cheers .

[2Munkys]

Dunno Daz; it's all getting to be a bit of a mystery to be honest. If the plenum is drawing in air through means not intended then that could be the source of your recent brake servo issue. And, If to that extent, then I'd expect it to be manifest in the performance of your motor too.

When you turned 'the' injector, is it possible that you disturbed a hose within its proximity? I've replaced leaking injector seals before but that's because I'd witnessed fuel being exuded; I'd not heard anything above the sound of the running motor. I've probably got one spare if you need it (seal, not motor).

I can't remember whether or not you've disassembled all the gubbins above the inlet manifold yet as part of your investigation. Smacks of something needing sealing up though.

Oh, get yourself an engineers stethescope; they cost next to nothing and can be invaluable.

http://cgi.ebay.co.uk/MECHANICS-NOISE-LOCATING-STE...

[GreenV8S]

Could be that the injector has a damaged 'O' ring seal. You could tell whether it is sucking in air by spraying lighter gas around the join with the engine running. If it's pulling in air then you will hear the engine note change and the revs pick up a fraction when it pulls in the extra fuel.

[That Daddy]

GreenV8S said:

Could be that the injector has a damaged 'O' ring seal. You could tell whether it is sucking in air by spraying lighter gas around the join with the engine running. If it's pulling in air then you will hear the engine note change and the revs pick up a fraction when it pulls in the extra fuel.

thats actually more common than people think on injected motors,remember Daz lower injector body engine vacuum and top of injector under fuel pressure about 35psi and not to be taken lightly(not trying to tell you how to suck eggs)if in doubt change all sixteen o,rings.

[daz the plumber]

ive just had a good look and noticed the the green fibre type washers are below the steal cir clips.how should they fit?i had the injectors removed last year and cleaned .all the fibre washers don`t seem to be doing anything .what do i need to remove to do the job and maybe its better to replace the washers and steal clips .does any one have any close up pictures of the injector fitted . the issing sound as now gone but when i use a stethoscope they all sound a little different .i can`t trust any one to do a decent job.i did have a small leak last year but i twisted it and since then its not leaked .

Edited by daz the plumber on Sunday 16th November 19:28

Edited by daz the plumber on Sunday 16th November 19:31

[V8 Animal]

daz the plumber said:

ive just had a good look and noticed the the green fibre type washers are below the steal cir clips.how should they fit?i had the injectors removed last year and cleaned .all the fibre washers don`t seem to be doing anything .what do i need to remove to do the job and maybe its better to replace the washers and steal clips .does any one have any close up pictures of the injector fitted . the issing sound as now gone but when i use a stethoscope they all sound a little different .i can`t trust any one to do a decent job.i did have a small leak last year but i twisted it and since then its not leaked .

Edited by daz the plumber on Sunday 16th November 19:28

Edited by daz the plumber on Sunday 16th November 19:31

You could pop over my car has plenum base plate removed at the moment fuel rail and injectors are there to see in all it's glory.
Car's not going anywhere not being touched again till the weekend when i get my parts back.

[daz the plumber]

can you see the green washer trapped between the clip and rail .mine are just floating below

[V8 Animal]

daz the plumber said:

can you see the green washer trapped between the clip and rail .mine are just floating below

TG at the moment

[V8 Animal]

There you go daz as promised.




My green washers spin around as well can only think there a dirt guard of some sort.
Hope this helps.
V8 Animal

[chrispitman]

I think the green band is just for Injector Identification some have it on the top and other around the body of the injector.

Remove the clips holding the injector to the rail and then pull the injectors out (takes abit of effort) then you will see the O Ring, I would go through and check that they are all in good condition if not replace. When putting back put abit of vaseline on the O ring to stop it ripping when pushing back together. (Also watch as you put them back into the inlet manifold that you don't catch an O ring.

Edited by chrispitman on Monday 17th November 18:27

[Pushrod-Power]

I would advise against reusing the O,rings especially on the fuel pressure side of the injector,the consequences could be costly.

[V8 Animal]

Off the shelf injector with the green band shown.
http://www.tvrcarparts.com/pages/partdetail.asp?id...

[trackcar]

^^^ what he said. If you need any Daz I keep them in so I can send you a new set of 16 if you like. use rubberlube or something similar putting them back in and make sure you clean the area of dirt before you start pulling it apart, you don't want any debris going down the injector inlet, or any small stones going down the hole into the inlet manifold

[GreenV8S]

Thought I posted a comment earlier about those green rings but it seems to have disappeared. As others have said, those aren't the 'O' rings; you can't see the 'O' rings until you have removed the injector. Also when you come to refit the injectors make sure the inside of the manifold and fuel rail that the 'O' rings will be trying to seal against are surgically clean, even the minutest spec of dirt can be enough to stop it sealing.

Edited by GreenV8S on Monday 17th November 20:37

[spend]

He's been posting duplicates in the 'removing the fuel rail' thread, you did answer

[daz the plumber]

some idiot as wedged the geen washer between the cir clip ,trapping it !thanks for the picture ,just had a good look some of the injectors seem to be in further than the others ,i can see a rubber exposed as it goes in to the head.the gap is different between the green washer and the top rail, think im going to take it to the experts

Edited by daz the plumber on Monday 17th November 22:14

Edited by daz the plumber on Monday 17th November 23:37