Just done a ecu test and it came up with 34 - detonation sensor wire. If I don't get this fixed will the car still run ok. Do you think this will cut the car out at high boost + WOT?

You WILL be in safety boost! Thats 7psi instead of 9. Trouble is, its engine out to replace it. Some people relocate the sensor to the upper intake but IMO this won't be good enough to detect the detonation. I reckon it *may* be possible to replace with the gearbox off but you'd need to be pretty flexible. At least it would save pulling the engine. Chances are it could even just be a bad connection on the harness - unfortunately at the det sensor end so you still have to get there. Another option would be to fool the ecu by bridging the connector with a 1MOhm resistor. This will stop safety boost BUT your ecu can no longer save your engine under detonation conditions - and you don't get long under det before your engine pops! Only real option is to replace IMO

 

HTH

 

CheerZ,

 

Andy

There's a post in the TT net vote to FAQ about alternative DET sensor locations. There's one that's on the back of the block which is reckoned to be as good as the stock location:

 

FAQ

thanks for info. seems i have had this problem for a very long time but not realised what it was. time to fix i think.

Anyone got a sensor and cable for sale?

Don't forget Andy, it also retards the ignition timing..

 

Seriously, you'll fix this and think "Oh my god.. it was so slow before!"

you could check to see if you have a open circuit on yer det sensor , sometimes the wire get rubbed through, check the connector at the back of the engine and see if there is any frayed wire going into it.

I used the location on the back of the head when mine failed but I was never 100% happy with it 'coz it isn't central. I didn't think much of the plenum chamber location because despite what it says in some articles the bolt used doesn't actually go into the block. (it bolts to the inlet manifold which in turn bolts to the heads)

 

I eventually found a 10mm bolt right at the back of the block in the centre of the V which is only about 6 inches back from the original location and on the same plane. It was fairly easy to get at after disconnecting a few pipes but then I don't have any EGR bits at the back of the engine. (they were removed when my engine was replaced 'coz they were completely blocked anyway.

 

If you can reach this bolt then it's just a case of using a slightly longer bolt and large washer as the 10mm bolt will be thinner that the standard bolt.

 

Colin