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[JamesV6CDX]

This car is definitely not right at all.

If you kick down from 40mph, it feels asthmatic. Standing start performance is also rubbish, absolutely no comparison to other 3.2's I've driven.

A look at the live data, while being driven, show's 'knock control enabled' when giving it some beans.

A comparison of a 3.2 of the same year, does not show knock control enabled however hard it's driven.

The other week, when I did a live-data log whilst driving, the spreadsheet shows knock-control enabled an awful lot.

It also shows voltages being given largely from knock sensor two (246 bank)

Sensors and wiring appears to be ok, upon a look in daylight.

Could it be something else going on with the combustion process, that's causing the knock control to want to activate??

[ffcgary1]

James, have you got a tank full of crap petrol? as this could be a reason the knock sensor is shouting.
Did you fill up just after the work you did on the car.?

[JamesV6CDX]

James, have you got a tank full of crap petrol? as this could be a reason the knock sensor is shouting.
Did you fill up just after the work you did on the car.?

Only ever fill up at branded stations.. I don't think it's the fuel  :-/

[mrgreen]

after reading this complete thread and after robert waded in i,m guessing it's a vacuum leak somewhere a hose that's been disturbed e.t.c and is collapsing under pressure i would start by replacing o-rings and hose one by one as they are cheap as chips and eventually you should find the problem, let's be real if nothings changed nothings changed surely it can't be anything else!!!! lol

[RobG]

Any of the co-ax screened cable to 246 bank knock sensor damaged :question

[Jimbob]

If knock control is active...

Id be draining the tank (by driving, not wasting, then put in some good fuel system / injector cleaner, a tank of vpower etc, then run on normal Shell etc for a bit and see how it goes.

May not fix, but should give a better starting point.

[mrgreen]

If knock control is active...

Id be draining the tank (by driving, not wasting, then put in some good fuel system / injector cleaner, a tank of vpower etc, then run on normal Shell etc for a bit and see how it goes.

May not fix, but should give a better starting point.

yes i agree fuel helps but if it was goodn before and all that.......but i must say this points to a common problem something is up here this is the second person to post with  the same problem there is definately something physical going on here and i would say first off replace the hose which rob posted and start from there, by moving stuff you certainly reveal any perishing for a start and why shold moving the plenum make a difference apart from connections it must lie there anything else makes no sense unless you knock wiring whilst doing this job.... :-/ :-/ i don't know but where else can it lie??? when there is two cars with the same symptons??:-/

[JamesV6CDX]

If knock control is active...

Id be draining the tank (by driving, not wasting, then put in some good fuel system / injector cleaner, a tank of vpower etc, then run on normal Shell etc for a bit and see how it goes.

May not fix, but should give a better starting point.

Jimbo - have ran pretty much only on shell for last 1000 miles now

 

[PhilRich]

James, I take it you've checked that the knock sensor is securely held in its holder? :-?

[JamesV6CDX]

James, I take it you've checked that the knock sensor is securely held in its holder? :-?

Tell me how to get to the bloody thing on the passenger bank, and I'll have a look!!

[RobG]

James, I take it you've checked that the knock sensor is securely held in its holder? :-?

Tell me how to get to the bloody thing on the passenger bank, and I'll have a look!!

There should be a connector on a flying lead around the area where the main loom goes to the ECU box for the knock sensor.
Knock sensor actually plugs in on plastic cable tray running over passenger side bank of cylinders and drops down by dipstick tube. Find the connector then follow the screened cable to it

[JamesV6CDX]

James, I take it you've checked that the knock sensor is securely held in its holder? :-?

Tell me how to get to the bloody thing on the passenger bank, and I'll have a look!!

There should be a connector on a flying lead around the area where the main loom goes to the ECU box for the knock sensor.
Knock sensor actually plugs in on plastic cable tray running over passenger side bank of cylinders and drops down by dipstick tube. Find the connector then follow the screened cable to it

It disappears under the coolant transfer pipe, and then my hands are not that big!!

[Kevin Wood]

It disappears under the coolant transfer pipe, and then my hands are not that big!!

.. which was disturbed during the thermostat change.

I know all looked well from above with the knock sensor cable, but this is significant enough to warrant retracing your steps a little and making sure it's not trapped under the transfer pipe, IMHO.

Failing that, try removing the sensor from the engine block and leaving it plugged in - or get another sensor from a scrapper and try it. They are normally reliable enough.

Knock retard will be your problem. It will kill performance by retarding the ignition yet not introduce a misfire or rough running.

Kevin

[JamesV6CDX]

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!!

[bob.dent]

It disappears under the coolant transfer pipe, and then my hands are not that big!!

.. which was disturbed during the thermostat change.

I know all looked well from above with the knock sensor cable, but this is significant enough to warrant retracing your steps a little and making sure it's not trapped under the transfer pipe, IMHO.

Failing that, try removing the sensor from the engine block and leaving it plugged in - or get another sensor from a scrapper and try it. They are normally reliable enough.

Knock retard will be your problem. It will kill performance by retarding the ignition yet not introduce a misfire or rough running.

Kevin

I seem to recall that at one of the meets Mike Dundee had some work done on his engine that involved the plenum coming off and when all put back together had a similar problem with loss of power. Turned out to be a trapped vac cable or wire IIRC.