A2 Tdi 2003. Loss of power when cold ABS and Yellow Triangle on! All clears once engine is warm and drives normal. Very confused, please help.

Unless they are properly knackered, you don't need new injectors - but if you have the time to leave the rocker cover open for a few days, you could get them removed, and sent away to Darwen diesels who clean and service them and send them back as good as new. Recommended to me by @depronman and the result was very impressive.
 
depronman said:
PD injectors rarely fail. They can wear out but failure is very unlikely
The loom is far far more likely
Changing an injector is no two minute job

Paul


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Thank you sir, I will tell him that 🙂

His reasoning for faulty injector was owing to the fault codes above.

I have installed a new filter with the bleed screw 👌

Unfortunately, a new filter has made no difference although I must mention that the old filter was in extremely poor condition

Thank you for everything
Mo
 
depronman said:
Well that’s not true
The looms do break
They also get loose connections over many miles
The loom lives in a harsh environment cold. Hot. Oil. Vibration etc

Paul


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I totally agree with you sir,and completely makes sense to me too.

Mechanic said that he's only ever found them to be loose in all his years.

I'm going back to see him on Tuesday, we'll wait and see.
Thank you again
Mo
 
MoMo said:
Thank you sir, I will tell him that

His reasoning for faulty injector was owing to the fault codes above.

I have installed a new filter with the bleed screw

Unfortunately, a new filter has made no difference although I must mention that the old filter was in extremely poor condition

Thank you for everything
Mo
Click to expand...

The loom being faulty or loose would report as a fault injector. If the injector is not connected to the wiring then it can’t operate as per instructions from the ecu. Thus the ecu will report the injector as interment fault
If the loom was shorting out then the ecu would report that but intermittent could mean faulty wiring or faulty injector

I’ve had injector go faulty but when they do they are normally faulty all the time not intermittent and I don’t recall ever seeing a PD injector fault. Worn yes faulty no

Now injector looms going loose and faulty is a very common issue


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To be fair to the mechanic, he did say that the "guys on the forum would know better because they are passionate about what they do" 😁😉

I'm going to read to him everything said here and hope that it'll help him see things better and with more clarity.

I have a feeling this is going to cost me a bit 😊

Have a lovely evening
Best wishes
Mo
 
MoMo said:
To be fair to the mechanic, he did say that the "guys on the forum would know better because they are passionate about what they do"

I'm going to read to him everything said here and hope that it'll help him see things better and with more clarity.

I have a feeling this is going to cost me a bit

Have a lovely evening
Best wishes
Mo
Click to expand...

Dark side development had/have the looks in stock at about £72 from memory
Personally I would tighten the connections first and go from there


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I am hoping that's the plan 👍

I will let you know how it goes.
Thank you for the recommendations
🤝
 
0.8ohm resistance to check the wiring I think, can be done from the connector, once the wiring loom is removed from the engine bay, pull the pink red pin first then twist off.
Earth being the brown wire and red injector one, yellow injector two and white injector three.
https://www.a2oc.net/community/index.php?threads/apparent-injector-wiring-loom-fault.12419/

Post in thread '1.4DTI Wiring Causing Misfire'

1.4DTI Wiring Causing Misfire

My 1.4 TDI 75 A2 has once or twice shown a 'misfire' whereby the engines seems to be running rough, poss on two cylinders and this seems to be related to damp conditions. Upon investigation there is a round electrical connector with 4 wires which goes to the top right hand side of the...
www.a2oc.net
 
Hello friends


I wanted to thank you all for your kindness in taking your time to write, advise and guidance on this matter.


To inform you all, I'm happy to say that my little A2 is now fixed.


I have changed the fuel filter, battery, injector loom (tightening) replacement loom and nothing worked.

As it goes, the old boy mechanic was correct from the beginning and it was injector cylinder 2. Once he replaced that it is now running better than before.


Thank you all again


Good health, peace and prosperity to you all

Mo
 
Hi everyone, not sure if I can pick this post back up or start new. My issues are similar to the above. Recently joined the forum.

I have a 1.4 tdi 2003 se. Started to have intermittent problems, going on to 2 cylinders, struggle with any incline. Mainly when cold and wet.scanner said injector 1 intermittent. Tried vpower, this did improve it but not resolved. It is starting to get really bad now. The abs then comes on generally if revs up too quickly. It will always clear, but struggling too many times now. My normal mechanic is not used to A2, so after reading loads of posts on here, thought best to ask the people who know what's what.
I have purchased a wiring loom, as posts say try always do the loom first before injector replacement (don't want to have to do this bit if can help it!).

Does anyone know of a mechanic in North Yorkshire please, who would be able to fit the loom for me?

in previous posts, someone said they cleaned the connector without having to take the cover off. Is this worth a try first, if so can you tell me where about it is?

Thanks
 
Sunflower said:
Hi everyone, not sure if I can pick this post back up or start new. My issues are similar to the above. Recently joined the forum.

I have a 1.4 tdi 2003 se. Started to have intermittent problems, going on to 2 cylinders, struggle with any incline. Mainly when cold and wet.scanner said injector 1 intermittent. Tried vpower, this did improve it but not resolved. It is starting to get really bad now. The abs then comes on generally if revs up too quickly. It will always clear, but struggling too many times now. My normal mechanic is not used to A2, so after reading loads of posts on here, thought best to ask the people who know what's what.
I have purchased a wiring loom, as posts say try always do the loom first before injector replacement (don't want to have to do this bit if can help it!).

Does anyone know of a mechanic in North Yorkshire please, who would be able to fit the loom for me?

in previous posts, someone said they cleaned the connector without having to take the cover off. Is this worth a try first, if so can you tell me where about it is?

Thanks
Click to expand...
What scan tool did you use?
Mac.
 
It was at a garage last year. I am not sure of the numbers but just remembered it said injector 1 intermittent. Which it is . It is only as said when cold and now damp. The garage said at the time the injector needs changing. However, I have read quite afew posts now on here, where to try first clean the connector, and replace wiring loom first..?
 
I have managed to find the details .

18074. Pd unit injector cylinderv1. N240 electrical malfunction intermittent p1666

17964. Charge pressure control negative deviation p1556. Intermittent

01314 engine control module read trouble codes . Intermittent
 
Hi @Sunflower a few questions...

How old is your battery, is it fully charged and is the alternator working correctly??

As for the codes the injector could be either the loom or the injector itself perhaps both.

The charge pressure negative deviation is normally the end cap on the intercooler split open and blown the O ring seal out. You would need an new intercooler.
 
If you can, I'd get the fault codes cleared, then rescan after a drive, just to be sure they are current fault codes, and not historical, save chasing a "phantom" fault.
Mac.
 
Hi @audifan
I changed my battery last year, this helped with the stopping and starting with abs light.
Thanks, I'm hoping it is the loom :)..
How much is an intercooler roughlyplease? Are they time consuming to fit?

Thanks again @PlasticMac . I understand what you mean about re doing. My normal garage is quite far away, plus only done in November. The problems I am having are the same.

I need to try find someone more local who knows about a2's, and can maybe start with the loom? So would appreciate it if anyone knows of someone in this area. Thank you S
 
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Mac.
 
@PlasticMac actually now you mentioned it. I'll probably try see change wiring loom first, as I have purchased that, and then do another scan, see if anything clears:)
 
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