Hey y'all, hope your quarantine is going better than mine
A few days ago I was driving my corvette back home and after filling up I started the car and was met with what sounded like a misfire and flashing check engine light. I was close to home so I just decided to take it slow and get it back to my place. After parking it I was also greeted by the "Low Oil Level" notification.

Some Background:
I own a 2000 FRC with 125k miles that I bought from BuyAVette in Atlanta a few months back. The only mods I have done are BC Racing Coil overs along with aftermarket wheels. When I bought it the only other mod to my knowledge was an aftermarket intake. I daily drive the car and do an occasional pull but don't really push the car other than that.

Symptoms:
Misfire (as mentioned above)
Excessive oil consumption
- The last oil change the car had was a little over a month ago and I daily drive the car if that helps give a rough estimation on how much oil is being consumed.
- The car would occasionally blow a slight cloud of smoke upon start up

I suspect it might be a possible ring failure along with the pcv valve sucking oil into the intake manifold along with a bad ground. I'm also going to include a picture of all of the codes I was presented with below.
Any sort of insight would be greatly appreciated as I am extremely new to the corvette scene in general coming from a primarily Nissan background. Also any reputable LS mechanic recommendations in North GA would be appreciated....

(some codes are duplicates as I wanted to make sure I didn't miss any)

 

Your misfire is most likely caused by oil fouling but removing the plugs and taking a look may confirm that !!... take a look at your dipstick and see if it’s pushed out If it’s seat caused by excess blow by which can be caused by a number of mechanical issues that you had mentioned...all of the other H codes are history but I wouldn’t worry about those for now...the P1431 is a fuel sender DTC. Below is the TSB that related to excess oil consumption .



Subject: Higher Than Expected Oil Consumption (Replace Rings and Engine Valley Cover)
Source: Chevrolet Dealer Technical Service Bulletin
Number: 01-06-01-023A

Models: 1999-2001 Chevrolet Camaro, 1999-2002 Chevrolet Corvette, 1999-2001 Pontiac Firebird, with 5.7L Engine (VINs G, S -- RPOs LS1, LS6)

This bulletin is being revised to add model years for the Corvette, information on the LS6 engine and parts information. Please discard Corporate Bulletin Number 01-06-01-023 (Section 6 - Engine).

Condition
Some owners may comment on higher than expected oil consumption. When checked, the oil consumption could be in the range of 400-600 miles per quart (700-1000 km/L).

On the LS6 engine only, the technician may find oil behind the engine throttle plate and in the intake manifold.

Cause
The cause for this condition may be an interaction between the piston rings and the cylinder bore in vehicles that are operated at higher RPMs -- typically manual transmission vehicles driven in a manner where the engine is frequently or consistently operating at greater than 3200 RPM.

On the LS6 engine only, the engine has a unique aluminum valley cover that has composite oil separating baffles and PCV plumbing incorporated. In some cases, the PCV baffle may not be properly sealed to the valley cover, causing oil to enter the PCV system.

Correction
On the LS6 engine only, replace the engine valley cover if oil is found behind the throttle body or in the intake manifold before replacing the piston ring. Refer to Engine Valley Cover Replacement in the Engine Mechanical - 5.7L subsection of the Corvette Service Manual.

A new set of piston rings is currently available through GMSPO. The new rings are part of a complete piston ring kit. Install only the number 2 compression ring and the oil expander ring from the piston ring kit. All other rings in the piston ring kit should be discarded. The original number 1 compression ring and the oil ring rails should be re-used in their original positions on the piston. All pistons should be used in the same cylinder bore.

Important
Do not dress or hone the cylinder bore. Nothing should be done to change the bore finish for this condition. Changing the bore finish may aggravate the condition.

Refer to the Unit Repair Manual for appropriate ring removal and replacement procedure.

The number 1 compression ring and the upper and lower oil expander rails are re-used because they are already broken in for the bore that they are in. The new number 2 compression ring is made with a very sharp edge that will break in quickly.

Changing only the piston rings noted, with no change in driving style, should change oil consumption to an acceptable level. Changes in driving style that reduce the amount of time spent at higher RPMs will also positively affect oil consumption.

In addition to the standard size piston ring kit listed below, a 0.25 mm oversized piston ring kit is available. The oversized piston ring kit should only be used in those rare instances where the cylinder bore size has been machined larger to accommodate the 0.25 mm oversized piston rings.

Parts Information

Part Number
Description
Qty

12568002
Valley Cover
1

88984247
Ring Kit, Piston
8

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

J0250
Manifold or Gasket Intake - Replace Manifold
Use Published Labor Operation Time

J1307
Piston, Rod and/or Rings -- Replace, Both Banks
Use Published Labor Time

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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