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Technical Service Bulletin # 90C51

Date: 941101

Recall - Excessive CO Emissions

Number: 90-C-51

Section: 6E

Date: Nov., 1994

Subject:
PRODUCT EMISSION CAMPAIGN 90-C-51 - HIGH ALTITUDE CO EXHAUST EMISSIONS

Model and Year:
1990 GEO METRO WITH 1.0L ENGINE (VIN CODE "6" - RPO LP2)
(NON-XFi VEHICLES ONLY)

To: All Chevrolet/Geo Dealers

The Administrator of the U.S. Environmental Protection Agency (EPA) and General Motors have determined that certain 1990 Geo Metro vehicles with
1.0L engines (VIN CODE "6" - RPO LP2) may exceed high altitude carbon monoxide (CO) Federal emission standards. This condition applies to
vehicles registered in Colorado, Nevada, New Mexico and Utah (vehicles which have moved to these states from California which are equipped with
RPO YF5 do not require this campaign repair). These standards were established to protect the public health and welfare from dangers of air pollution.
Excess emission of pollutants may cause a vehicle to fail state mandated emission tests.

To correct this condition, vehicles registered in the four affected states will have a redesigned oxygen sensor installed.

RECAP 90-C-51

ZONE

INVOLVED

2

NEW YORK

0

3

ST. LOUIS

1

4

MINNEAPOLIS

0

5

KANSAS CITY

0

6

SAN FRANCISCO

86

7

DALLAS

100

8

ATLANTA

0

9

CINCINNATI

0

10

DENVER

861

11

CHICAGO

0

13

PITTSBURGH

0

14

WASHINGTON

0

15

PHILADELPHIA

0

16

CHARLOTTE

0

17

MEMPHIS

0

18

DES MOINES

0

19

PORTLAND

0

20

LOS ANGELES

18

24

NEW ORLEANS

0

25

INDIANAPOLIS

0

26

TAMPA

0

28

CLEVELAND

0

30

HOUSTON

0

32

BOSTON

0

36

SALTLAKE

654

39

PHOENIX

536

44

DETROIT

0

47

MOLINE

0

C.O. CONTROLLED

0

TOTAL DOMESTIC

2,256

GRAND TOTAL

2,267

Vehicles Involved

Recall - Excessive CO Emissions|Page 295 > < Manifold Pressure/Vacuum Sensor|Specifications|Page 286