98 Pontiac gtp running very rich
took car in for new cat, old one wore out leaking at collector and rattling in side, they
did some gas test and said have to fix rich condition before can install new cat. I new it
was running rich and had both o2 sensors replaced earlier. Also had replaced injectors
earlier with bargain set bought on line. It has a hard to start problem except 1st thing in
morning.and intermittent up and down idle. air flow sensor replaced but still does it. It
also has a new maf sensor. My ECM is performance flashed and about 8 yrs old.
What am i missing here thks Andy
is the engine running cold? if so, replace coolant thermostat. that is another reason to cause a rich condition.
Turns out a 7.99 can of maf sensor cleaner did the trick. I removed the sensor and sprayed inside the maf housing, threw the screen, then the sensor. Let dry. Runs like a champ and has 280k miles.
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