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Author Topic: 1.8T TTE420 strange knock CFs  (Read 51192 times)
carsey
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« Reply #15 on: January 23, 2016, 10:11:42 AM »

I gathered that.  We found it out at original mapping the first time when it was constantly throwing a VVT setpoint error.

Currently sat at -7KW on block 093 in VCDS.
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n0ble
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« Reply #16 on: January 23, 2016, 10:28:33 PM »

Why haven't you fixed it then?
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adam-
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« Reply #17 on: January 24, 2016, 02:40:54 AM »

Because he thought it was his vernier, IIRC.
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carsey
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« Reply #18 on: January 24, 2016, 07:14:49 AM »

I did look into it.

Originally had a vernier on there....replaced for stock pulley and code persisted.  Cams lined up 100%, 16 rollers, timing bottom end and top marks were perfect.

Looking at it now, and putting a second tensioner in to try fix the problem,  I can have the 2 marks lined up with 16 rollers,  but then if you allow the VVT tensioner to fill with oil,  It can move the inlet camshaft 1 tooth forwards so that it no longer lines up with the hole.   Push the chain back down and the markers on the cams/caps line up again.

So im stuck until I can find out where the chain needs to be to be timed up...since it can differ by quite a bit
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carsey
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« Reply #19 on: January 24, 2016, 11:10:49 AM »

If anyone has a 1.8T with VVT to hand....can you please tell me what value you get in Block 093 of VCDS.  3rd box.  Relates to the position of the VVT.  Mines at -8KW Sad
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fknbrkn
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« Reply #20 on: January 24, 2016, 12:38:30 PM »

-7kw
replaced all timing and vvt, double checked, still the same
ive seen -2, -6, -8 at various cars
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carsey
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« Reply #21 on: January 24, 2016, 12:45:55 PM »

Strange.  Odd that others have a similar value.

Heres mine with VVT unplugged




Here it is plugged in.





Just seems strange.  Wonder if it has anything to do with the timing/knock CFs etc
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pedrosousa
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« Reply #22 on: January 24, 2016, 12:56:35 PM »

Mines at -9

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carsey
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« Reply #23 on: January 24, 2016, 03:14:27 PM »

093 is the difference between the cams and the crank I believe.
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ddillenger
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« Reply #24 on: January 24, 2016, 09:26:34 PM »

You don't understand. Regardless of what it says there, the change should be ~22. It should not be 22, then jump to 27.
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n0ble
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« Reply #25 on: January 24, 2016, 11:31:55 PM »

Maybe pay a professional to sort this at the base then tweak your way from there?
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Lost
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« Reply #26 on: January 25, 2016, 01:05:01 AM »

Bad tensioner?
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carsey
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« Reply #27 on: January 25, 2016, 04:40:23 AM »

I tried another tensioner, but didnt get the car out to log it.

My tuner says the value in 093 should be near to 0.

Will drop the other tensioner in and give the car a log see what it does, but the data shows timing could be out, although I am certain its right.
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vwaudiguy
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« Reply #28 on: January 25, 2016, 07:38:02 AM »

I tried another tensioner, but didnt get the car out to log it.

Are these new tensioners you're trying?
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« Reply #29 on: January 25, 2016, 09:27:14 AM »

It looks like tensioner loosing it and streching too far. As somone said, it looks near a failure.
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