Trouble with intermittent knock sensor fault code

[AdrianL]

Hi everyone,
I have a 2005 MK1 Leon Cupra R.
Hope you can help as I'm starting to pull my hair out over this one!

So I bought a cheapo VAG-COM cable (KKL) and noticed I was getting the following error code:
16712 - Knock Sensor 1 (G61): Signal too High
P0328 - 35-10 - - - Intermittent

Here's what I've tried so far:

• Cleaned existing knock sensor & retorqued to 20nm
• Replaced knock sensor
• Had wiring checked (all ok)

Now if I clear the code down, it disappears under normal driving. But under hard driving, it shows up again....

any ideas?

Thanks,
Adrian

 

[AdrianL]

Also... no CEL, and no noticeable performance issues.

 

[wildrides]

The car will have been mapped and be producing engine knock under load that is out of tolerance for the piston crown and standard rods . Get it re mapped and should be ok.

Dont drive it hard in the meanwhile or you could hole a piston with detonation . Vag 1.8t are very high compression for a turbo engine and thus need knock sensors to protect the pistons.

 

[AdrianL]

As far as I'm aware it has never been mapped. Only performance mods are cat back exhaust and K&N panel filter.

The car boosts at 1.1 bar (spike), then holds at 0.9 bar.

The error code seems to suggest that it's a faulty sensor / wiring rather than knock. I can't hear knock either.

http://wiki.ross-tech.com/wiki/index.php/16712/P0328/000808



Are there any things I can check? Is there a way to tell if it has been mapped? The garage is out of ideas apart from a new ECU......

 

[wildrides]

Check ALL the PCV pipes for leaks from splits and check for broken dipstick tube . The crankcase operates in a partial vacuum sealed system on this car . Any leak to atmosphere from a split pipe causes momentory weak mixture because air enters the system from outside . This can cause a brief pink which activates the knock sensor .

in the pvc system under the inlet manifold there is a valve ( where big pipe and small meet ) This valve controls the vacuum in the crankcase . It can wear out and cause the same problem . Change this valve to make sure it has not worn out or is sticking.

 

[AdrianL]

Check ALL the PCV pipes for leaks from splits and check for broken dipstick tube . The crankcase operates in a partial vacuum sealed system on this car . Any leak to atmosphere from a split pipe causes momentory weak mixture because air enters the system from outside . This can cause a brief pink which activates the knock sensor .

in the pvc system under the inlet manifold there is a valve ( where big pipe and small meet ) This valve controls the vacuum in the crankcase . It can wear out and cause the same problem . Change this valve to make sure it has not worn out or is sticking.

Thanks. I will check this...... however, it's not what the fault code seems to indicate. The fault code is saying the value is higher than expected... i.e. it's out of the expected possible range... so an open circuit, faulty sensor, faulty wiring..... etc....?

 

[AdrianL]

Anyone else had this issue?

 

[ibizacupra]

yes, it was wiring.
fix was run microphone cable direct from knock sensor to ecu, problem went away

 

[AdrianL]

yes, it was wiring.
fix was run microphone cable direct from knock sensor to ecu, problem went away

I've heard of people doing this, and I may well give this a go. The car also seems to be running lean as well though (just found out today) see here:
http://www.seatcupra.net/forums/showthread.php?p=4371482#post4371482

Thanks,
Adrian

 

[ibizacupra]

Log block 001,031,118 to confirm and check what 032 says

Sent from my HTC One using Tapatalk

 

[AdrianL]

Log block 001,031,118 to confirm and check what 032 says

Sent from my HTC One using Tapatalk

Will do, thanks - Will look at this tomorrow.

Cheers,
Adrian