C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Nov 6, 2006 | 01:08 AM
  #1  
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Shawn_65
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From: Cambria CA
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So I got the vette back from the shop after getting the Distributor Cap, Rotor, Coil, Plugs, Wires, Fuel filter, and 8 Injectors(22.5Lb)

The car runs and sounds great, now when I rev it, it kinda pops and it feels like theres a lot of pressure and grumbling, is that normal?

its sounds amazing, and it Accelerates furiously and Smooth. No more Hesitation, the Idle is better(though it jumps a bit sometimes), and it sounds cleaner while cruising.

My major problem is that the MPG went way down, I get 19 on the highway at a very slow speed and I'm averaging 12.6 mpg... even with the few sprints on the highway..this is way to low..

should I take it back and have them check the ECM or what? I dont know whats wrong..I do need an oil change...but the air filter and PCV Valve are clean...

any input will be appreciated
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Old Nov 6, 2006 | 10:56 AM
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rick lambert
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From: seattle WA
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I'm gonna bet your 02 sensor is poop, typically the first place we check when mileage go down, could be the cause of your other problem too.
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Old Nov 7, 2006 | 12:14 AM
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Shawn_65
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hmm, after driving today on the highway..the milage isnt as bad as I thought, but I'll check out that sensor, thanks
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