2020 - 2021 Corvette: Service Bulletin: #PIP5715B: Rough Idle With Misfire Counts On Random Cylinders - (Feb 15, 2021)

#PIP5715B: Rough Idle With Misfire Counts On Random Cylinders - (Feb 15, 2021)

Subject Rough Idle With Misfire counts On Random Cylinders

Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

from

to

from

to

Chevrolet

Corvette

2020-2021

All

All

6.2L LT2

All

 

Involved Region or Country

North America

Condition

A Low mileage vehicle (like PDI) May have a concern with a rough idle and misfires counting on random cylinders. 

Cause

This could be caused by marshalling the vehicle around and/or short runtimes soot fouling the spark plugs.

Correction

If this is encountered, use GDS  to  command the  engine speed up to 2000 rpm for 10 minutes and evaluate the concern. 

If the misfires stop counting, return the vehicle to the customer. 

If the concern is not completely gone, the vehicle may need to be driven to finish cleaning the spark plugs. 

If the above does not resolve the concern and the sparkplugs are fouled preform the following.  

If a sparkplug needs to be replaced to fully correct the concern, it is recommended to replace all 8 sparkplugs,   

 

Version

3

Modified

03/11/2020 - Created on.

04/08/2020 - Updated Correction.

02/15/2021 - Added 2021 MY 

 

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