if you had an air leak your hc's would be higher from a lean condition(1000-2000
not uncommon ),and if your
plugs have signs of carbon or exesive gas , your problem will be a failing O2
sensor , take out all spark plugs and check the condition , if all look the same
(carbon) then is global and a failure in the O2 sensor is evident ,if only some look
bad then failing spark plug wires or plugs and in very rare cases broken injector
cups,a dirty airflow
meter will make your car sluggish and lean , your best bet is get your car to a
friend that have a scanner and monitor data of the O2 sensor , if its not reading
right but working it will not throw a check engine light , but it will make the
computer think the
car is lean and compensate gas ,making it richer ,when the car doesn need it ,
if any of these turns positive , your catalitic converters will be dead and you will
need to replace them as rich condition is cats #1 enemy , most cars will pass with
new cats even if theyre not running right .
things to check.
fuel presure reg diaphgram
clean air flow meter diodes (not to be confused with the iat wich is in the same a/f meter)
dispose any spark plug wires with 5k ohms or more of resistance
clear the computer via scan or grounding pin 7 in the dlc for 15 secs or disconect -batery for 1 min.
run the car 10 miles @ high rpms cats must be very very hot to pass smog quick.
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