Fine tuning - idle CO - knackered AFM?

[smash]

OK so engine is running so decided to run a Lambda up it's jacksy to see the idle CO.

Waaaaaay too rich at 0.81 lambda and no amount of unscrewing the AFM adjustment would lift that. Screwed the adjustment screw in (took 11 turns!!) and then screwed out 2.5 as per Honest Johns EFI guides. Result = 0.71 you could almost see the fuel gauge moving lol.

Enter Hallsies AFM which gave 0.91 straight out of the bat - just about right to pass MOT.

Back to mine and the adjustment ran out at 0.81 - that was the leanest it could do.

They must have unscrewed it to the max for MOT and probably explains why TPS was set to 0 V at idle to try and lean off further!

Could something be blocked? Do I need a new AFM or can I service this one?

Appreciate thoughts - reluctant mechanic of Southend

Edited by smash on Saturday 3rd May 13:05

Edited by smash on Saturday 3rd May 13:08

[PHJayV8]

I think mines giving problems too, I noticed the black cap had been removed in the past, and been relocated using some sort of sealant, but it's started to lift.

I read somewhere this cover must be completely sealed and air tight otherwise it can cause probs.

Managed to locate a boxed new old stock unit, will see if that makes any difference

What should the settings be?

Jay

[PHJayV8]

This guy appears to know his stuff, albeit for the SD1

http://www.vintagemodelairplane.com/pages/Rover_Te...

[Wedg1e]

How to strip an airflow meter:

http://www.wedgeneering.co.uk/images/Lucas%20Airfl...

The theory behind sealing the cover is that air might be drawn through the shaft bearings on which the flap pivots, effectively bypassing the metering system and affecting the fuelling.

[smash]

Thanks for that - have looked at the powerpoint but I think that's beyond me!

Just for info my idle AFR works out to about 11.5 at idle which is pretty horrifically rich.

Is the AFM on the 390 the same as the 350?

[Wedg1e]

smash said:

Is the AFM on the 390 the same as the 350?

Yep. The injectors usually are as well.

[wild rover]

Check the fuel pressure should read about 36/38 psi. Check the regulator a lot of them have an adjustment. Hope it helps.

[smash]

Fuel pressure set to 38psi

[smash]

Seeing as how the old gal has been sat for 6 months now I decided to give her a quick wash.

I think after I've picked up a spare AFM it'll be MOT then dyno setup then wheels refurb'd then give proper clean and wax

[Waynester]

That looks very nice Smash... I see what you mean about it looking similar to Firefox's old 'yellow' Wedge.

[mrzigazaga]

Each time i look at that photo it looks like a model...I think its the way the background and foreground are out of focus...Looks stunning mate...Ziga

[smash]

HTC M8 u-focus

Just bought a spare AFM - hopefully collect tomorrow

[mrzigazaga]

Hi mate...Who you going to use for the wheel refurb...I would recommend Lepsons, They are in Gillingham but they do a stunning job..I have used them twice now and I'm well impressed..

Delilah:


Poppy

[smash]

Wow - they look mint! There's a company local to me @ £50 per wheel - their gallery is impressive but pics don't tell the whole story I know.

Are your's lacquered? What's the damage with Lepsons?