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  #11  
Old 23-06-12, 21:57
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Rake Rake is offline
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

I would. Heck the injector resistance pin to pin and also pin to ground (injector body)
Let me know the readings both hot and cold.

That fuel temp is a clue. When these go they make the timing unstable. I lay odds that it's the temp sensor in the pump.

I would be very surprised if the injectors are the problem.

Last edited by Rake; 23-06-12 at 22:06.
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  #12  
Old 24-06-12, 23:14
sirweste sirweste is offline
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

Cheers for the advice gents. Been out riding my bikes rather than crawling around under the van for once!!

So when I arrived in Shropshire today I took a picture of every page of vagcom!








I'm so convinced that this isn't fuel pump related! It's just too unlikely that two different pumps have this exact same, fairly unusual, problem.

As you can see the read outs on the measurings blocks the rule temp is more reasonable.

The hot/warm reading for the sensor injector was around 115 ohms.

Cheers again for the help, much appreciated
Ryan
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  #13  
Old 25-06-12, 05:37
jets jets is offline
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

My thoughts are that the engine needs to be above 85C, well it does for timing reading.
I wasn't able to download video so maybe you had it up to temp. for those readings.
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  #14  
Old 25-06-12, 07:02
sirweste sirweste is offline
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

Right I'm gonna sort out the coolant temp sensor commectioms this week.
Take it from there.
The engine was up to temp, either way it wouldn't effect my symptoms.

Can everyone else see the vid??
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  #15  
Old 25-06-12, 09:11
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

Your fuel temp is way off in the vag scope screen.

Choose to ignore if you like but this is exactly the symptoms of the fuel temp sensor in the pump fella.

MAF is off too.

Pot 4 injector not good either - deviation of 2.5 and the injector is duff.

Engine has to be at 90 to take readings.

Coolant temp seems ok.

Last edited by Rake; 25-06-12 at 09:14.
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  #16  
Old 25-06-12, 14:02
sirweste sirweste is offline
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

Two threads is gonna get confusing!!

I'll start off by saying that the poor fella has covered over 320000 miles now so there's bound to be some tired parts!!

MAF sensor the same erratic timing is produced with it disconnected
Will disconnect fuel pumP sensor soon and see if that could be causing it.
Coolant temp seemed a little low to me, but then I assume diesel run cooler than my a-series used to.

Don't know if I said this or not but disconnecting the sensor injector stops the scattered erratic timin, though I assume this is expected as the reading from that injector is one of the things used tO plot points on the graph?

Cheers
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  #17  
Old 25-06-12, 17:18
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

The NMS tells the pump and ECU where the commencement of injection is so yes it is possible as its part of the chain.

Did you get the readings I suggested from it ?

Need to get that fuel temp on vagscope again. It did say 132 degrees....not F was it ?



Also known as the G81, this sensor has a direct effect on start of injection.
A bad sensor can make your timing unstable.

(this is not my hand !)

Last edited by Rake; 25-06-12 at 18:13.
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  #18  
Old 25-06-12, 20:24
sirweste sirweste is offline
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

Cheers, been working On the bike tOnight, so not had anytime to check out.

Will try to find some time to get on it tomorrow. Hate taking the figgin belly pan off!!
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  #19  
Old 25-06-12, 20:32
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

Quote:
Originally Posted by sirweste View Post
Cheers, been working On the bike tOnight, so not had anytime to check out.

Will try to find some time to get on it tomorrow. Hate taking the figgin belly pan off!!
Keep it off till fixed
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  #20  
Old 25-06-12, 20:56
dombandit dombandit is offline
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Default Re: 2.5 TDi timing scattered / unstable timing - this isnt a "how do you time TDi" po

ive got same issues
have found a problem broken wire in loom above rocker cover
very small black and white wire looked ok untill i pulled it lightly
but i think because it was broken it causes the temp sensors to brake
waiting for a delivery from gsf
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