How to tune a 3.5L carb on my 84 110 - Land Rover Forums : Land Rover and Range Rover Forum
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post #1 of 3 (permalink) Old 01-12-2011, 05:59 PM Thread Starter
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How to tune a 3.5L carb on my 84 110

Just recently moved to Clovis, NM (thanks USAF), which is over 4000 ft above sea level. The truck is running great but is idling a little lower than normal on the first start of the day. Is there a way to tune the carb for idle other than using the choke on the steering column. For example, I own a 65 mustang with a edlebrock carb I installed, on the front are some screws that you can use to adjust your fuel/air mixture to adjust the idle. Is there something like this on the 3.5L V-8 carb for the Land rover?

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post #2 of 3 (permalink) Old 01-20-2011, 03:33 PM
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Hi I don't have the vehicle you are speaking of but I do have the workshop manual we need to establish weather you have Zenith carburettors or SU's or for the US market you have something completely different. The manual does identify there are such adjustment screws but they are covered with anti tamper plugs and been twin carbs its a little more complex than normal. According to the workshop manual both versions have auto chokes which means either someone has bypassed to auto's or there is something completely different on your vehicle.

Here might be useful download the fuel system and have a look.
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post #3 of 3 (permalink) Old 04-24-2011, 04:19 PM
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i've plenty same experiences on 1970's RRs with similar spec(3.5 Eng+ Solex/Zenith carbs)

seems your carbs are manual or semi-automatic, which hadn't adjusted themselves after height change! so:

1st suggestion is: if it works with choke till warm up and then everything goes sound ,do not attempt to adjust carbs ,(as they have to be synced correctly together. it needs experience and tools)

2nd:you can raise the idle speed (there are two screws for each carb but since you do it for right one the other obeys! right one's in visible in front and back of choke throttle mechanism)

3rd: you can re-tune ignition timing to more advanced (change the current position of distributor)

these were all shortcuts,its obviously suggested to get them done in a LR shop & exactly mentioned in LR book.

any more questions are wellcome

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