please help, 1.8 16v KR start up problem

I think he's from Spain actually, so a tad far perhaps?

 

thanks m8 but I am from Spain [:^(]

I have a couple of questions about KR injectors:

1. does anyone know about the injectors' inner micro-filter??

2. what O-RINGS should I buy? I mean, what size, or...?

 

well I have just purchased 4 injectors from a guy in the-corrado.net forum so I will give this post an update probably this weekend (if my girlfriend helps me to check the injectors.... I F)

 

Hi. I have just pulled out the injectors after a 15seconds drive and any of them were leaking. I removed one of them from it's fuel line and (almost) no fuel fell out of it !! :-|


I have found that the injectors I bought are not the same as KR ones!!! they don't have an o-ring on it's lower section (once in the manifold so you understand what I mean), and if I put it in the engine, it seems loose and freely of movement when I play with the fuel rail !!?


any help.. please... if you reply now, I can go to the car and replace all of them



then purchased injector's part number is: 0 437 502 023 (014)


thanks for looking

 

the one on the top is the one I bought
and the bottom one, the kr one I had in my engine

 

and did they feel like "loose" when you touch the fuel line???


were them the same part number?


thanks

 

when i tested mine then swapped them at least 25ml came out of the rail when i unscrewed the injector,untill the pressure dropped off

 

yhes but I only kept the car started for less than 15 seconds, may it have any relation with it?

 

the system will pressure up instantly,15 seconds is plenty of time to have pressure,when you take one of the lines off the metering head it should spurt everywhere,bit like opening a bottle of pop that youve shook a few times

 

even in a stone cold engine? I mean, does the fuel accumulator work in cold engine too?

 

this is what I did:

started the car
moved about 20meters (~15 seconds with engine on=
stopped engine
and about 15 minutes later, I pulled an injector and unbolted it from it's fuel line. there was some fuel going out of it, but only about 5ml... and not pressurized at all.


I need to say that my fuel accumulator is new, has done only 15.000km...

 

ok you said 15 sec in the other post now 15 mins,when i changed my injectors there was no pressure as such more of a trickle,its when you undew the banjo's like on the m/head or wur you get the pressurized squirt

 

sorry, I have edited my last post. I kept the engine on for 15 seconds, and unscrewed the injector after 15minutes since the engine was shuted off.

I may try to put the 'new' injectors in my c this afternoon and see how they work


edit: I may do the fuel delivery test as well (definately not too much work for a monday afternoon after 8hrs spent in my job )

 

well thats a good sign of a good accumulator then,have you done any delivery tests,did you read my thread,we may be having similar probs here
http://www.clubgti.com/forum/showthread.php?t=192852

 

no, I haven't done any delivery test yet. I might be doing this next weekend; however I also have to replace brake lines & rear engine mount....

 

hey, one year later, still the same problem... with warm engine, after more than ... 10 minutes of stopping the engine, it gets HARD to start... and when it starts, it keeps idling like crap for about 10 seconds... like on 3 cylinders... then it runs fine.


to sum up:
-injector seals OK
-co OK
-fuel pressure tested, OK
-fuel accumulator brand new
-both fuel pumps OK
-fuel filter OK
-no leaking injectors (checked today )




so today I pulled out all injectors after having had the car parked for about 1 or 2 hours or so, and none of them were leaking. Btw, I dropped an injector o-ring (the small one) into a cylinder but nothing has happened .


I'm really going mad....


by the way, all spark plugs had a good colour EXCEPT cylinder n1's one, which was really black does that mean that this cylinder is running rich? May it be due to that injector not having a good cone spray shape?

 

did you test the residual holding pressure,you say you have a new accumilator but theres the none return valve on the end of the fuel pump too,has that been replaced,sorry if its been brought up before but long thread one year later ,and me being to lazy to go over it all again

 

I think that this residual pressure wasn't tested

any pic of this non return valve please? I think it wasn't replaced. well, sure, it wasn't