1991 Land Rover Discovery Black Smoke

LAND ROVER
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ESZED
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hi, my v8 1991 landrover discovery is spewing black smoke, how do i get to run leaner without being ripped off by those that assume i am wealthy and foolish:)
Mar 24, 2006 at 6:44 PM
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PEPPERMRJ
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Easy way is to replace the air cleaner. Be sure there are no retrictions in the air inlet. Also might be time for a new O2 sensor. How many miles?

Post back. :)
Mar 25, 2006 at 11:19 AM
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ESZED
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shes done 166 000 km, never been for a service!
Mar 25, 2006 at 11:25 AM
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PEPPERMRJ
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You are overdue my friend. :shock:

Where are you located?
Mar 25, 2006 at 11:27 AM
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perth australia, heres the prob, they want thousands for the service when i am capable of changing oil and plugs, however tuning is another issue
Mar 25, 2006 at 11:33 AM
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PEPPERMRJ
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there is not much that can be tuned in a fuel injected vehicle. Chances are you have a bad sensor input somewhere. Do you have any engine lights lit?
Mar 25, 2006 at 11:35 AM
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ESZED
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nope, heres the thing, if it starts quick it doesnt blow smoke, if it starts 2nd or third time with prompting it will blow smoke so i reckon ur correct and theres a sensor that needs replacing, question where do i look
Mar 25, 2006 at 11:40 AM
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PEPPERMRJ
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I would start with replacing the spark plugs, plug wires, and the distributor cap and rotor (if so equipt). Run a tank of fuel with fuel injector cleaner.
Replace air filter, fuel filter, PCV valve, and check for any vacuum hose leaks.

Might be all that is needed. Post back if not. good luck. :)
Mar 25, 2006 at 11:47 AM
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Suggested Repair

Replace the air filter and check the air inlet for restrictions. Replace the spark plugs, plug wires, and distributor cap and rotor if equipped. Replace the fuel filter and PCV valve, inspect vacuum hoses for leaks, and run a tank of fuel with injector cleaner. At this mileage, an oxygen sensor may also need replacement.

Conversation Summary

The owner of a 1991 Land Rover Discovery V8 with 166,000 km reports black smoke and wants a leaner mixture. The vehicle has never been serviced, has no check-engine light, and smokes more after hard starts. The expert said a fuel-injected engine offers little to tune and recommended ignition and intake service: plugs, wires, cap and rotor, air and fuel filters, PCV valve, a vacuum-leak check, injector cleaner, and possibly an oxygen sensor.

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