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Re: '87 4kq fuel system problems
In a message dated 7/24/99 6:16:02 PM Eastern Daylight Time,
<< Symptoms: black smoke coming out of the tail pipe; excessive fuel
consumption (below 10 mpg); running extremely rough because spark plugs
caked with carbon desposits, in some cases clogging the gaps; very black
Took it to Bellevue Motorsports, they replaced the air hose that runs
between the ISV and air intake plenum and the O2 sensor, and they reset the
fuel-air mixture. I replaced the plugs and the air filter. The cap and
rotor are new and the wires < 1 year old.
In my experience, black smoke means a rich mixture, gray or whitish
means oil consumption. If it is truly black, you have a fuel system problem
which seems youve already discovered. I would check the fuel mixture again
(10m.amps), and an air/fuel ratio gauge hooked up to your oxy sensor would
also confirm the richness.