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Do the injectors need coding

13K views 14 replies 4 participants last post by  Lukestrat1984  
#1 ·
I have a 1.8 tdci 2007 I have had injector fault and cam sensor fault both have been replaced but the engine is still stuttering/hiccuping and falling over into limp mode

Does the injector need coding will it fix my issue ?
 
#2 ·
The injectors should be recoded but lots swap them without recoding.

You may have another issue. Whats the fault code coming up now?

Done a leakoff test since swapping the injector?
 
#5 ·
I've changed the injectors on the same model before and they didn't need coding the siemens injectors do not Need coding the bosch ones do but they are used on the 1.6l & 2.0l as far as Im aware? (someone please add info if incorrect?) do you have any info on the work that's been done? Was it a garage or DIY job and were the copper fire washers changed? Did they check they were the same thickness as the originals? This can alter timing which can cause all sorts of problems. Are the correct leads connected to the correct injectors? This will also cause massive running issues as the firing order will be out of sync withe the engine. Egr is also worth checking, has it been scanned and were there any fault codes? Any other symptoms? The more info you give the better. Engine code I worked on was kkda is your engine the same code? This will help with identifying the exact layout/setup of the engine

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#6 ·
Sorry just read your other post. My previous reply still applies. If its a DIY job check that the correct injector has been changed but again I'd say check the egr to rule it out if nothing else, easiest way is to blank it with a plate temporarily even a cut up coke can will do to blank it for a test just don't leave it in place while driving as it may melt due to being thin. Reply back if any of my suggestions work and I can try to help further. Depending on the problem and engine type I have some spare parts from my old one (written off) that may be of use

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#7 · (Edited by Moderator)
Thanks for your reply currently have the engine not running as the spill off rail ended up getting damaged. The copper fire rings are different sizes on all four injectors original and replacement ones. Egr hasn't been checked in all truefullness. it is a DIY job but by a fully qualified machanic
 
#8 ·
Thanks for your reply currently have the engine not running as the spill off rail ended up getting damaged. The copper fire rings are different sizes on all four injectors original and replacement ones. Egr hasn't been checked in all truefullness. it is a DIY job but by a fully qualified machanic
 
#9 ·
OK wasn't implying anything by asking if DIY just helps to know (I teach mech eng at uni [emoji6]) I would deffinatly check the egr valve as is an easy and free fix if cleaning is all that's needed. The fire washers should be somewhere near the Same (they get crushed when injector is tightened on the seat)

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#10 ·
No worries there ???? fire washers I have two thick ones on the injectors that haven't needed to be replaced and two thin ones on the ones that have needed to be replaced

I have been trying to fix this issue since buying the car four weeks ago I've come to the conclusion that it was a previous known about issue and it was a case of sell it and get rid of it
 
#11 ·
Washers alter the timing??

Blanking the EGR eliminates that completely, i would use something thicker than a coke

can though. Steel from a tin can for just getting the engine running. If its driving i would

want something thicker than that. Seen thinner plates which have melted. That molten

metal is going through the engine and through the exhaust and turbo. Not ideal.
 
#12 ·
Washers alter the timing??

Blanking the EGR eliminates that completely, i would use something thicker than a coke
can though. Steel from a tin can for just getting the engine running. If its driving i would
want something thicker than that. Seen thinner plates which have melted. That molten
metal is going through the engine and through the exhaust and turbo. Not ideal.
Cans are usually aluminium and Steel and tin are very different materials so your being very loose with your terms or very unaware of the last 30 years of recycling efforts. The fire washers alter the height of the injector from the cylinder which will alter the timing if only slightly can cause running issues

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#14 ·
In general, injectors are the only components in a car which -each and everyone- have been tested at the manufacturing line.

The operational performance of each injector has been measured, and deviations from an ideal injector are then expressed in coding so that the ECU can more or less rectify the deviations.

The reason for the testing/coding/rectifying procedure is -of course- cost. It is cheaper to test and code than to discard a substantial number of injectors because they deviate too much from an ideal injector.
 
#15 ·
Absolutely agree, provided they're fitted to the manufactures specifications including the washer thickness and torque settings. There's a reason the washers are sold as being for a certain make/model/year of car and not a one size fits all. They inevitably fail due to contaminates from the fuel so best to change your fuel filter regularly if I changed an injector I would change the filter at the same time.

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