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

Car is running rich

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Old 05-24-2016, 01:07 PM
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BrianCunningham
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Default Car is running rich

Air-fuel gage is reading 7.8

Seeking advice on places to start looking

Vortech S-trim on a 1995 383 LT1 with AFR heads & a custom cam

Had the discharge pipe from the blower to the throttle body pop off a
couple of times

the flood of fuel lite off in the exhaust, flame out the exhaust

wondering if that fried the O2 sensors

thoughts?
Old 05-24-2016, 01:15 PM
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antfarmer2
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I would pull the vacuum line off the fpr and smell for fuel look for leaky injectors as well as the o2s. Check the oil for fuel do not want a grenade.

Last edited by antfarmer2; 05-24-2016 at 01:17 PM.
Old 05-24-2016, 01:40 PM
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THE 383 admiral
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7.8??? at idle? WOT? is this a wideband? 11.X would choke out the engine.
you will need to answer many questions. 95 PCM tables. tuned, Injector Rate.

Vacuum Leaks??? FPR diaphragm rupture? I would imagine your injectors are not leaking??
OK your forced induction. you could be dialed in 11.9 ish @ WOT. if you have a decent sized blower.

Last edited by THE 383 admiral; 05-24-2016 at 01:58 PM.
Old 05-24-2016, 02:00 PM
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BrianCunningham
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@ idle

that's why I was like WTF???

could just be the o2 on for the gauge
Old 05-24-2016, 02:08 PM
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THE 383 admiral
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for safety. I would confirm. the basics. then pull and inspect the Wideband. O2. running that RICH. is known to destroy the O2. clean off any residue? and hope the AFR. was not a almost impossible 7.8 @ idle.
Old 05-24-2016, 02:14 PM
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cv67
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Good suggestions
No exhaust leaks ahead of the 02s?
Old 05-24-2016, 02:22 PM
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BrianCunningham
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the gauge, which is on a separate O2 says 7.8 most of the time
Old 05-24-2016, 02:23 PM
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BrianCunningham
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Originally Posted by cuisinartvette
Good suggestions
No exhaust leaks ahead of the 02s?
Not that I saw
Old 05-24-2016, 02:26 PM
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THE 383 admiral
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pull the wideband O2 clean. and see if it will calm down. then read 16 AFR in the open air.
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Old 05-24-2016, 02:58 PM
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THE 383 admiral
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again. for confirmation & safety. once the open air reading is confirmed. can you get enough O2 wire lead. to read. let's say a Camry exhaust pipe. As you know this should read about 15.2
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Old 05-27-2016, 11:11 AM
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THE 383 admiral
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Brian,

any results? hopefully. NO new's = good news.
Old 05-27-2016, 08:04 PM
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BrianCunningham
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Not yet, but I was driving all day and the car ran fine

Last edited by BrianCunningham; 05-27-2016 at 08:04 PM.

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