99xcss4
frank'n (truburban) K-2500
dose any here know any thing about 5.7 vortec dual cat exhaust system only having 3 o2 sensors I had all ways thought they had 4 of them?
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
305s are single cat with a Y pipeOr it's a 305.....
The 4.3s and 305s both have 4 02 sensors. 1 behind each manifold, 1 after the pipes merge in the Y-pipe ahead of the cat and 1 after the single cat.meaning it won't have 4 O2 sensors lol
They do not, some of the L31 2-door Tahoes and the Vans have a single cat in both California and Federal emissions. California adds an electric air pump.All the Calif. Emissions have two cats, 4 each O2 sensors.