Low rev misfire

[Jhonno]

I notice the odd bank lambda still spends a bit of time at 0.01, is this lean or rich?

[Jhonno]

Drove her in to work this morning..

Still loads better.. Idle slightly high, and there is a pull away stutter still present, and an occasional 3k miss, but the improvement is night and day.

[Jhonno]

I think I have worked out what the remaining stutter is.. Play in the even throttle arm. Which I think can be taken up with a spring.

[CerbWill]

The arm connecting the rod linking the 2 banks to the spindle running through the throttle bodies? There's a grub screw holding the arm on and, on the 4.2 arrangement at least, it's on the underside. Maybe check that's not vibrated loose?

[Jhonno]

CerbWill said:

The arm connecting the rod linking the 2 banks to the spindle running through the throttle bodies? There's a grub screw holding the arm on and, on the 4.2 arrangement at least, it's on the underside. Maybe check that's not vibrated loose?

I didn't realise that.. Good shout ta. Nice and awkward to get to I am sure!

[Jhonno]

Jhonno said:

CerbWill said:

The arm connecting the rod linking the 2 banks to the spindle running through the throttle bodies? There's a grub screw holding the arm on and, on the 4.2 arrangement at least, it's on the underside. Maybe check that's not vibrated loose?

I didn't realise that.. Good shout ta. Nice and awkward to get to I am sure!

Winner.. Grub screw was loose.

[TwinKam]

[Thom]

So is it running as it should now?

[Jhonno]

Thom said:

So is it running as it should now?

Will find out later.. It was much better, but when I tightened the arm, it threw the bank balance out, I did tweak it based on TPS values, but not quite close enough. Tweaked it properly this morning, but raining currently.

[Jhonno]

Misfire be banished!

[Byker28i]

Good news.

If you've the original throttle arm, it might be worth replacing with a threaded bar and some ball joint sockets.
Some made them using threaded bar and joint ends.
https://www.ondrives.com/search?cid=0&q=ras5

Or you can go better. You need 1 each of the 5mm ones CFF.00.05 and CFF.00.05LH
https://www.ondrives.com/search?cid=0&q=CFF.00...

Model car's have reverse threaded turnbuckels such as
https://www.boltonmodelmart.co.uk/sw-330123a-swork...


Some made them
https://www.pistonheads.com/gassing/topic.asp?h=0&...
https://www.pistonheads.com/gassing/topic.asp?h=0&...

I have one - it's really good for setting up and maintaining the throttles.

[Jhonno]

Byker28i said:

Good news.

If you've the original throttle arm, it might be worth replacing with a threaded bar and some ball joint sockets.
Some made them using threaded bar and joint ends.
https://www.ondrives.com/search?cid=0&q=ras5

Or you can go better. You need 1 each of the 5mm ones CFF.00.05 and CFF.00.05LH
https://www.ondrives.com/search?cid=0&q=CFF.00...

Model car's have reverse threaded turnbuckels such as
https://www.boltonmodelmart.co.uk/sw-330123a-swork...


Some made them
https://www.pistonheads.com/gassing/topic.asp?h=0&...
https://www.pistonheads.com/gassing/topic.asp?h=0&...

I have one - it's really good for setting up and maintaining the throttles.

Not a bad shout for a future mod.. My ends are getting a bit sticky to adjust.

[FarmyardPants]

Jhonno said:

Misfire be banished!

[ukkid35]

Byker28i said:

Or you can go better. You need 1 each of the 5mm ones CFF.00.05 and CFF.00.05LH
https://www.ondrives.com/search?cid=0&q=CFF.00...

Well worth replacing with rose joints, but there are more affordable options

https://www.ebay.co.uk/itm/283414435847

https://www.ebay.co.uk/itm/283414435846

[Byker28i]

Jhonno said:

Misfire be banished!

Is that a sister product to:
https://www.nulon.com.au/products/aerosols/start-y...

[Jhonno]

Byker28i said:

Is that a sister product to:
https://www.nulon.com.au/products/aerosols/start-y...

If only it had just come in a can!