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 Post subject: Injectors
Posted: Mon Oct 02, 2006 12:03 am 
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Hey all.

A couple of days ago i decided to get my injectors reconditioned. Seems to run fine, however i have one issue. Now when my car is cold it is a b**ch to start, it runs rough as guts for a couple of seconds after it finally starts, and the (!) symbol appears for a couple of seconds while it's running like s**t. My car has never had any problems starting, especially when cold. The mechanic said it could jsut be the remainder of the solution they clean the injectors with, and to give it a little while. It seems to start fine when it's warm, so that theory doesn't really make sense to me.

Someone else suggested resetting the ecu as it may have learnt to compensate for dirty injectors duty cycle. I done this morning to no avail.

Does anyone have any suggestions as to what's going in? Considering my car had no problems starting before i had the injectors reco'd it has to be the source of the problem

Thanks, Kyron.

 

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Posted: Mon Oct 02, 2006 12:38 am 
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did you install them youself?

completly out there wild theory.

maybe one of them isnt seated right? may have a leak or something when cold, and when it warms up might seal ok?

 

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Posted: Mon Oct 02, 2006 11:42 am 
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Nah had the mechanic install them. I might take it back and get them to check, thanks for the suggestion mate.

 

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Posted: Mon Oct 02, 2006 6:26 pm 
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Kingkezza wrote:
Nah had the mechanic install them. I might take it back and get them to check, thanks for the suggestion mate.


When you said recondition injectors, did they pull every apart or just ultrasonically clean them?.

Did they test each injector for:

*Spray pattern
*Flow
*Leak down
*Electrical resistance (Ohm's) &
*Electronic faults in the injector

 

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Posted: Tue Oct 03, 2006 11:00 am 
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Slick wrote:
Kingkezza wrote:
Nah had the mechanic install them. I might take it back and get them to check, thanks for the suggestion mate.


When you said recondition injectors, did they pull every apart or just ultrasonically clean them?.

Did they test each injector for:

*Spray pattern
*Flow
*Leak down
*Electrical resistance (Ohm's) &
*Electronic faults in the injector


I'm not to sure what they actually did to be honest mate, i believe they replaced the seals and then ran them through some kind of solution :?

 

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Posted: Tue Oct 03, 2006 11:22 am 
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Remember now that you did reset the ECU, it will run rough regardless for the next week until the ECU settles down. After that you can see if the original problem remains...
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Posted: Wed Oct 04, 2006 9:46 pm 
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Kit wrote:
Remember now that you did reset the ECU, it will run rough regardless for the next week until the ECU settles down. After that you can see if the original problem remains...


I've reset the ecu dozens of times before and it has never started like that. Not only that but that doesn't explain why it only does it when it's cold.

 

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Posted: Mon Oct 09, 2006 10:03 am 
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Hi there.... Did you manage to resolve your cold starting probs after fitting of injectors ? I recently fitted a brand new set and have cold starting probs as well.
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Posted: Mon Oct 09, 2006 11:20 am 
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Hey Matey. No solution as yet. I am taking the car back thursday week to get it sorted out. What are the symptoms of your problem? My mechanic suspects one of the seals is leaking making it hard to start when cold

 

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Posted: Mon Oct 09, 2006 11:58 am 
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Kingkezza wrote:
Hey Matey. No solution as yet. I am taking the car back thursday week to get it sorted out. What are the symptoms of your problem? My mechanic suspects one of the seals is leaking making it hard to start when cold


Well, i changed my injectors because i had a seperate issue with running out of fuel/ getting crap in to the filter/putting a hole through the filter to get going/allowing crap through in to the injectors (or so i thought)...After fitting a new filter, i had probs starting hot or cold. No probs prior to this. The car has 300,000 + kays so thought it would benefit from the new injectors anyway. Fitted brand new Bosch injectors. Now it cranks over for a while when cold..fires up... runs a bit rough then settles. Is ok when warmed up. I took care when fitting the new injectors..everything clean/ vaseline smeared on the o rings (not to much).. Will persevere for a while and see if it settles down.
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Posted: Mon Oct 09, 2006 8:53 pm 
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sounds like leaking injectors to me,overnight or when sitting all day one or some leak then when you try to start it the cylinders have a heap of fuel in them so it runs rich untill excess fuel is burnt away

 

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Posted: Tue Oct 10, 2006 9:12 am 
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madeaspack wrote:
sounds like leaking injectors to me,overnight or when sitting all day one or some leak then when you try to start it the cylinders have a heap of fuel in them so it runs rich untill excess fuel is burnt away

Yep..you could be right...Only thing, it seems like the fuel has drained away back to the tank and then you have to wait until it pumps through again. I reckon mine starts better when cold if i turn the ignition on and wait for a short while, then start. Is there a one way valve or w/e in the system ?
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Posted: Tue Oct 10, 2006 7:10 pm 
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there must be some kind of pressure releif valve when engine is not running coz if your rail is charged after a while it loses pressure

 

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Posted: Thu Oct 19, 2006 5:35 pm 
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madeaspack wrote:
there must be some kind of pressure releif valve when engine is not running coz if your rail is charged after a while it loses pressure


Finally found what my cold start problem is. Took the fuel line off from the entry point on the fuel rail. Adapted a piece of clear hose and routed it in to a container to check fuel flow. All good so far. After i did the test , i watched and after a while the fuel started to drain down the clear pipe. In ten minutes it had drained away. Checked all connections back to the tank (filter etc)..all good. My shop manual says there is a one way non return valve in the pump. (x 2 as it has the standard two tanks) Must be shagged. Now , when cold or after it has been sitting for a while...just turn the key on and off a few times (listen for the whirr of the pump) and the fuel is back up to the rail (and injectors), and it starts first pop everytime.
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