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Q: I've got a 01 chevy Silverado extended cab z71ive had it for about 8 months as soon as I bought it realized it burned way too muc

asked by on

01 chevy Silverado extended cab z71ive had it for about 8 months as soon as I bought it realized it burned way too much fuel took to shop an was told knock sensor an o2 sensors need replacement as well as previous owner bored out both cats an put back on idk if that could add to thelose of power an fuel incre uased use. But now she's been parked one morning going to work I started her up like I do every morning sat fir a moment then put truck into reverse an nothing then i went threw all gears an nothing happend. Sat fir a second tried it again and when I put in revers this time I mashed gas an it jerked me hard as crap an same in drive maybe heard a lil humming noise and vibration when I got on the road it seems to have quit well I got off the interstate an I heard a loud chain noise it sounded just like a big metal chain dragging on the pavement an then she would vary go at all when I mashed gas basically Fred Flintstones it to parking spot an then she wouldn't even lock intoanything

My car has 189000 miles.
My car has an automatic transmission.

A: This could be a variety of issues. A malfun...

This could be a variety of issues. A malfunctioning O2 sensor could definitely be the cause of your truck burning too much fuel. As you've indicated, the catalytic converters have also been modified, which will also alter the messages that the O2 sensor relays to the vehicle's computer making incorrect air/fuel corrections. These types of inconsistent changes to a vehicle's air/fuel mapping can cause other mechanical components to also fail over time. I would recommend having an expert from YourMechanic come to your car's location to diagnose and repair the stalling problem.

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