Tuning Range Rover 3.9ltr V8 ?

First things first: make sure the timing is set properly, and make sure all vac pipes are good.

Then try removing the air filter and indeed also the filter to carb air supply pipe, and see if your starting, idling and acceleration change.

What oil did you dump in the top of the dash-pots?

It's a pity you have Strombergs, they are a b*tch to tune compared to an SU which has an external adjuster on the main jet needle.

The stromberg metering needle is adjustable by removing the damper piston on top of the dash-pot and inserting a long thin flat-head screwdriver.

I just put Cat 15w40 engine oil in the dash pot's it what I had on hand .
There was no oil in them at all . Do they normally use oil ? or could that indicate a fault ?

I will try and get a lend of timing light from someone and check my timing .


The car had been parked up for almost 12 months as well maybe it just needs to be run .

The thicker the oil, the slower the vacuum pistons drop after a rev.

But it should work OK as long as it's not EP90.:o

Check the timing, the vacuum pipes and try starting without the airfilter. (Check for rodents in the airbox, I'm not joking......)

Hello.

From memory I recall a similar problem was due to a damaged rubber diaphragm. The Stromberg carburettor has a rubber diaphragm between the piston and body. Should the rubber diaphragm tear or perforate, then the engine will run very rich.

My suggestion is to check for a torn diaphragm, remove the top of the carburettor (four screws) and lift out the piston. The diaphragm is attached to the piston like a skirt. Any damage will quickly be evident. If okay, carefully refit the piston and sit the diaphragm back into the groove in the carburettor body, refit top and four screws.

Sorry I can't be of more help.

Regards,

Peter

Quote:

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From memory I recall a similar problem was due to a damaged rubber diaphragm

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With those symptoms , that is what I would look at first.
Regards Philip A

Thanks guy's I will have a look at the diaphragm and replace the vac hoses .

Quick update for you guy's I removed the top of the left hand carb and inspected the diaphragm it looks ok to me no obvious splits and is not brittle or perished at all however the piston look's to be slightly porous I don't know if that could cause an issue for me ?

What I found when I went to remover the top cover of the right hand carb is that someone has already been in there before me and damaged the screw heads . So I will remove the damaged screws at work tomorrow and see what I find in that carb .

Thanks again guy's .

Dave .