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All Technical Service Bulletins for PROM - Programmable Read Only Memory: > < Emissions - Testing Inspection Failures
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PROM - Programmable Read Only Memory: Customer Interest
Engine - Spark Knock

Number:

84-111

Section:

6E (VIt)

Date:

July, 1984

Subject:

SPARK KNOCK COMMENTS

Model and Year:

1984 CAMARO, CELEBRITY, AND CITATION WITH 2.5L ENGINE

TO:

ALL CHEVROLET DEALERS

This cancels and replaces 84-111 dated June, 1984 which should be destroyed. This copy identifies an additional axle ratio and a revised TCC
engagement speed.

A customer comment of spark knock on the 2.5L engine may be received. If normal diagnosis in Section 6E2 of the Service Manual does not repair this
condition, a new PROM may be installed, as listed below. This condition applies only to vehicles with automatic transmissions/transaxles.

Celebrity and Citation With 2:39 Axle

P/N 1226909

Celebrity and Citation With 2:84 Axle 

(Also Increases TCC Engagement Speed 

to 38 MPH)

P/N 1226909

Camaro With 3:73 Axle

P/N 1226911

All Technical Service Bulletins for PROM - Programmable Read Only Memory: > < Emissions - Testing Inspection Failures