Big backfire then 16712 - Knock Sensor signal too high

[Feel]

Yesterday, on the way out of work, car still cold, accelerating from 30 to 40 (so not hard, but using some boost) I had what I assume was a huge misfire followed by a huge backfire.

It was a sudden total loss of power (didn't feel like one cylinder, felt like all of them) that lasted less than a second (I managed to get to the "F" in "WTF"), followed by a huge whoosy pop that seemed to come from the airbox area (thought a pipe had bown off), followed by the eggy smell.

Car ran fine afterwards (perhaps even a bit better).

vag-com says 16712 - Knock Sensor 1 (G61): Signal too High : P0328

Is it true that the Knock sensors are basically microphones; so the big pop as it cleared it's throat could've been what gave the fault?

 

[Jonzy]

The knock sensors only listen for specific frequencies. Sounds like a coilpack had a fit.

 

[Feel]

P.S. Googling "16712 p0328" return seatcupra.net at the top of the list

 

[Feel]

Just vag-com'd and the fault was up again (but no misfire this time).

Do I have a knock sensor on the way out (if so which one? The fault code says "Knock Sensor 1"), or is it just picking up excessive timing advance?

 

[Jonzy]

Have you logged the car to check the timing, not just the fault codes.

I belive the knock sensors on the 20vt are under the inlet manifold. I havent got my laptop to check. Not sure if both the sensors are the same and have the same plugs but you could prob switch them and check the fault codes?

 

[Feel]

Not very recently, logged timing, no - a couple of weeks ago it was fine - with perhaps one cyclinder pulling a fair bit more; which according to some reading I was doing last night suggests the kock sensor's going.

Car feels fine (but then, I've had fairly big boost leaks and it's felt "fine"), so I'll keep my eye on it for now.

 

[Feel]

Hmmm, missing this morning but only when cold - once it got right up to temperature it was fine.

So, coilpack, sparkplug or lead?

 

[Martyn]

Goto be a dodgy plug mate, if it was a coilpack I'd of expected it to have packed up competely.

 

[Feel]

Cheers.

Only serviced 3-4000 miles ago...

 

[Martyn]

Were the plugs done on the service? If so perhaps a coilpack was slightly damaged upon removal?

 

[Feel]

I suddenly thought that after I'd posted - it was a 60k service, I don't know if they're changed at 60k??

 

[sportbilly]

dont think they are, first change is at 40k so I would think the next would be 80k ... so I was told.

 

[Feel]

Hmmm. One of those "Is it worth having a conversation with the dealer" moments....

 

[sportbilly]

Hey, Phil you had a cam belt change yet? They reckon it will be ok to 100k ....

 

[Feel]

I wouldn't risk it...

 

[sportbilly]

Mine's up for its 60k next and thinking about getting water pump done which means CAM belt aswell as its off, the only problem SEAT will only replace with plastic one again... mmm..

Could be quite expensive, 60k service + water pump + CAM belt + brakes no doubt

 

[Feel]

Talk to them nice, see if they'll put a metal one in if you buy it?? Problem is, they'll not warranty it...

 

[sportbilly]

out of warranty after 60k anyway .... so its only the part they would warranty anyway surely.

 

[Feel]

60k give or take any good will, but it's a good point

 

[Feel]

Timing pull is a bit "funny" ??

http://homepage.ntlworld.com/p.revill/Logs/WeirdTiming.csv

Anymore help, pleeeaaaaseee