How much play in the Dizzy? Causes of Knock?

[newsh]

What do you chaps think of this?

Click this for a video vvv



I'm using the hall sensor in the dizzy for the ABY ECU so no sparks in there, there's not much lateral play I can detect but it moves up and down a lot. There's also a little oil getting in, I can see it through the trigger window.
I'm wondering if this could be the cause of my strange knocking symptoms. I remember years ago having problems with the car when Mihnea was mapping it, every now and then it would throw a big misfire and a cloud of smoke out the back. Mihnea said he thought the dizzy might not be lined up right, the ECU would see the hall trigger go out of the window and react as though it was knocking and throw a load of fuel in to put out the fire. I had a look and sure enough the marks were off by a few mm at TDC. Corrected it and the car has run great for about another 100,000 miles. Till now when it seems to be recording knock (but I'm not hearing it knock) And it's done a few big cutouts at full and sometime part throttle and sometimes the ECU resets.

BTW I just checked the timing marks and they look pretty good, a bit dark and cold to really be 100% sure at the mo.

What other possible causes of knock are there, it seems to mostly be happening on cylinder 4 but the other cyliders are showing some too.

Compression is a healthy 10.5 - 11 Bar on all 5.

[A1QSHIP]

On my first 7a powered Coupe I had a inner exhaust valve spring that broke. The knock sensor interpreted this as spark knock & pulled timing. It sounded like a distributor gear rattling about.
HTH, Chris

[220bhp]

John I changed my distributor because it had play, just like yours. But afterwards I was told that under rotation It is forced into one position. I have a distributor of the doner car I bought, If I can find it. I will see if it is the same. How many miles have you done since your rebuild.

[prj]

Distributor misalignment won't make the ECU see knock.

[mike74]

Probably more of a fuelling problem I'd think. Has the FPR ever been replaced?

[SteveH]

I have the head off my motor John so I can check to see what movement I have in the dizzy. I'm replacing the head with an ABY head so need to graft the hall sensor wires from the ABY unit into the old 3B wiring which is connected to an ABY ECU. I recon I could hear some rattling from the top of the head on my car which sounded like it was the dizzy or dizzy drive gear. I was most noticeable when blipping the throttle from idle.

[UrS4boy]

I'm replacing the head with an ABY head so need to graft the hall sensor wires from the ABY unit into the old 3B wiring which is connected to an ABY ECU.

You could just extend the wiring using one or both of the 21/22 three pin connector pair (or not):

[sidrick]

Cut your nails

[SteveH]

You could just extend the wiring using one or both of the 21/22 three pin connector pair (or not):

Cheers

Connectors won't be the problem, it will be getting the wires joined up correctly

[newsh]

Probably more of a fuelling problem I'd think. Has the FPR ever been replaced?

FPR and injectors are brand new, 044 pump and filter are not that old, wideband says mixture is good.

[newsh]

Distributor misalignment won't make the ECU see knock.

Ok, well that's what I was told when we mapped the 3B ECU and it certainly fixed the problem, so maybe it's just the ECU resetting.

Is it possible this is a mechanical knock, like a small end or a bad lifter or is it definitely pinging. Because I know what pinging sounds like and I don't think it is.

[newsh]

On my first 7a powered Coupe I had a inner exhaust valve spring that broke. The knock sensor interpreted this as spark knock & pulled timing. It sounded like a distributor gear rattling about.
HTH, Chris

Interesting, there is a weird rattle that comes and goes, not very loud but sometimes there when blipping, I'm tending towards a mechanical problem rather than detonation.

[newsh]

Cut your nails

[newsh]

Distributor misalignment won't make the ECU see knock.

On one of the logs, the RPM max was 10,400 RPM. Does that suggest anything? (probably double what the actual log should have been.)

[newsh]

I was going to look at the flywheel sensors and make sure they're clean but the bolts are nasty so it will have to wait..