Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Kevin Wood]

More than happy to do that Kev, I'll have another look (with a cold engine!!) but to be honest, I can't see the 2-4-6 knock sensor underneith, or above, for love nor money!!

It's in about the centre of the engine block on that side. Probably best located from underneath. A black cylinder with a bolt through the middle and a wire coming out of it.

Kevin

[TheBoy]

From memory, reach it from underneath, behind engine mounts.

[TheBoy]

And Project TB1 (2.5 v6) had a knackered sensor, was fine on initial pull-away, but lack of power above 2000rpm as the retardation kicks in.

[JamesV6CDX]

TB, did that log a fault code?

[TheBoy]

TB, did that log a fault code?

In my case, yes, as the wire was in 2 pieces

[Elitenut]

James I don't know if this helps, first time I've tried to post a picture.



Brian

[JamesV6CDX]

Further update - knock sensor changed.

What a job, by the way. Don't think I have any skin left on my right arm. It's right up behind the 246 engine mount, and it all had to be done by feel.

I also had to remove the oil filter housing (with the usual complications) to get access to undo the bolt 

I also couldn't follow the exact route of the old wiring, without removing lots of things I wasn't prepared to!! So I found a route that works well, and secured the cable away from heat etc.

So, how is the car behaving with the new sensor....... ?


...... Absolutely no bloody different!   

It does come to life a bit after about 3000 rpm, but before that, it really is asthmatic for a 3.2, I've driven MUCH better - including my own, up until I did the stat change.

So - if it's not the sensor...

Why is knock control activating , with values for bank 2?

Some other combustion problem on this bank?

Worth another live data check whle driving, to see what values are doing now?

I'm stuck with this one 

[JamesV6CDX]

Just to add, MPG is ok.

I drove from our place in Gloucester, to Sassanach in Trowbridge, up to Kevin's place in Hampshire, and a fast motorway run back home (plus some local running around)

320 miles to £90. About right for a 3.2 V6 - 21mpg.

(Considering, I was hoofing it on the backroads to Andover!)

[Kevin Wood]

That's a bummer.

Worth trying the old knock sensor connected but not bolted to the engine?

Not sure if it's clever enough to work out it's not picking up normal combustion from the sensor, but maybe worth a try?

Wiring back from sensor to ECU? Might be worth checking this?

Kevin

[aaronjb]

I didn't see it in the last few posts so; is the code you're getting a "faulty knock sensor" code or a "knock detected" code? (I don't even know if the Omega has both..)

If you're really getting knock on one bank, I'd be thinking fuel or ignition problems on a single cylinder - faulty injector/connection, coilpack/connection, cam position sensor perhaps (assuming the 3.2 uses one to determine ignition timing, along with the crank sensor)?

[Kevin Wood]

No codes, but live data shows knock retard active at anything above light throttle. :-/

Kevin

[aaronjb]

Here's a thought - this started after the thermostat change which will have involved coolant loss.. any chance of a suddenly blocked coolant passage in the head on that side causing a localised hotspot and pre-ignition?

[JamesV6CDX]

Worth trying the old knock sensor connected but not bolted to the engine?

The exact thing crossed my mind last night 

Only problem is, due to the wiring route, I had to snip the connector off the old one in order to remove it  But I'm sure I can get hold of another.

I think I'll do another live-data run to see if knock control is still activating? Just to make there isn't more than one issue?

Failing that, how about fitting new plugs, (I have them) and then swapping the coil packs around to see if the issue moves to bank 1?

We'll get there 

[henryd]

Seems to point to air leak on 2-4-6 bank causing weak mixture and knock sensor kicking in,could the servo or the pipework be leaking air

[JamesV6CDX]

Seems to point to air leak on 2-4-6 bank causing weak mixture and knock sensor kicking in,could the servo or the pipework be leaking air

Airleak has been strongly considered, however:

All vacc hoses checked

Idle steady - would be increased, if air leak?

Airleak wouldn't affect it at high RPM, when it needs as much air as poss?