Page 221 of 338
When  you put the cap back on, turn it to the right until 
you hear at least three clicks. 
I NOTICE: 
If you need a new  cap,  be  sure  to  get  the  right 
type.  Your  dealer 
can get  one for you. If you get 
the  wrong  type,  it  may  not  fit or  have  proper 
venting,  and  your 
fuel tank  and  emissions  system 
might  be  damaged. 
6-8 
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        Page 222 of 338
Fuel Door NIanual Release 
If your vehicle has a fuel 
door lock,  the fuel  door  can 
be  opened  manually  in  case 
of 
an electrical  power 
failure. 
Open  the trunk,  the release  mechanism  is 
on the driver’s 
side 
of the vehicle, at the  top  of the  trunk  compartment. 
Pull  the tab  rearward  to release the fuel  door. 
NOTICE: 
Prying  on  a  locked  fuel  filler  door  can  damage  it. 
Use  the  remote  fuel  door  manual  release  located 
in the  trunk. 
-- 
Checking  Things  Under  the Hood 
The following information  tells you how to check  fluids, 
lubricants  and important parts  under the hood. 
To open  the hood,  first pull the hood  release handle 
inside the vehicle. 
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        Page 224 of 338

Engine Accessory Belt 
A 
C 
The 3800  (L36)  engine  uses  an  engine  accessory  belt. 
This  diagram  shows the  features  connected  by the  belt 
routing.  See “Maintenance  Schedule”  in the  Index  for 
when  to check  the belt. 
A.  Power  Steering 
B . Alternator 
C. Air Conditioning 
D. Crank 
E. Coolant Pump 
E Tensioner 
3800 Supercharged (L67) Engine 
(Option) 
Your  Bonneville  may  have a 3800 Supercharged  engine. 
The  Supercharger  is 
a device  which is designed  to  pump 
more  air  into  the  engine than it would  normally 
use. 
This  air  mixed  with  fuel, creates increased  engine 
power.  Since the Supercharger  is a pump  and  is driven 
from  an engine  accessory  drive belt,  increased  pressure 
is  available  at  all driving  conditions. 
The  powertrain  control  module 
(PCM), works  with a 
vacuum  control to regulate  the  increased  pressure 
required  during  specific  driving conditions.  When  this 
increased  pressure  or boost is  not  desired,  such  as during 
idling 
and light  throttle  cruising, the excess air that the 
Supercharger is pumping  is  routed  through  a bypass. 
All 
of these  controls,  working  together provide  high 
performance  character 
and fuel efficiency in the 
3800 V6 Supercharged  engine. 
The  power  steering  pump uses a remote  reservoir 
mounted  on the throttle  and cruise control cable  bracket. 
See  “Maintenance  Schedule” 
in the  Index  for  when  you 
should  check  the fluid. 
6-11 
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It’s a good idea to check your engine oil every time  you 
get  fuel. 
In order to get  an accurate reading, the  oil must 
be 
warm and  the vehicle must be on  level ground. 
~ The engine oil dipstick 
is directly behind the 
i engine fan area. 
Turn 
off the engine and  give the oil  a few  minutes  to 
drain back into  the oil pan.  If  you  don’t,  the oil dipstick 
might not  show the actual level. 
To Check Engine Oil 
Pull out the dipstick and clean it  with  a paper towel  or 
cloth, then push  it back in all the  way. Remove  it again, 
keeping 
the tip down, and check the level. 
When to  Add Oil 
If  the oil  is at or  below the ADD line, then you’ll  need 
to add some oil. But  you must use the right  kind. This 
part explains what kind  of oil  to  use. 
For crankcase 
capacity,  see “Capacities and Specifications”  in the 
Index. 
t 
I NOTICE: 
Don’t  add  too  much  oil. If your  engine  has so 
much  oil  that  the  oil  level  gets  above  the 
cross-hatched  area  that  shows  the  proper 
operating  range,  your  engine  could  be  damaged. 
Just fill  it enough to put  the  level  somewhere  in  the 
proper operating range.  Push the dipstick 
all the way 
back in when you’re through. 
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        Page 227 of 338

What Kind of Oil to Use 
Oils of the  proper  quality for your vehicle  can  be 
identified  by  looking for the  “Starburst”  symbol.  The 
“Starburst”  symbol indicates  that 
the oil  has  been 
certified  by the  American Petroleum  Institute  (API),  and 
is  preferred  for use in your  gasoline  engine. 
** 
L 
t 
t L 
4 
If you change  your  own oil, be sure you use oil that has 
the “Starburst” symbol on the front of the  oil  container. 
If you have  your oil changed for you, be  sure the oil put 
into  your  engine is American  Petroleum  Institute 
certified  for gasoline  engines. 
You  should  also  use 
the proper  viscosity  oil  for your 
vehicle, 
as shown in  the  following  chart: 
~ 
RECOMMENDED  SAE VISCOSITY GRADE ENGINE OILS 
FOR BEST  FUEL  ECONOMY AND COLD STARTINB, SELECT THE LOWEST 
SAL VISCOSITY GRADE OIL FOR THE EXPECTED  TEMPERATURE  RANGE. 
HOT 
WEATHER 7 
“C 
+ 38 
+ 27 
+ 16 
t4 
-1 
- 18 
M 
LOOK 
FOR THIS 1 
SYMBOL 
I E ERRRED 1OW-30 
mve 0°F (-1 8°C) 
WEATHER 
DO NOT USE SAE 2OW.50 OR ANY OTHER GRADE OIL NOT RECOMMENDED 
6-14 
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Inflation - Tire Pressure 
The Tire-Loading  Information label which is  on the rear 
edge 
of the driver’s door shows the correct inflation 
pressures  for your tires,  when  they’re  cold. 
“Cold” 
means  your  vehicle has been sitting for at  least three 
hours or driven  no more  than a mile. 
NOTICE: 
Don’t  let anyone  tell you  that  un’derinflation or 
overinflation is all right.  It’s  not. If your tires 
don’t 
have enough  air (underinflation]  you can 
get: 
0 Too much flexing ’ i . ’:+?,,% 
Too much heat 
Tire overloading 
Bad  wear 
Bad handling 
Bad  fuel  economy. 
. . . .> .’“’ 
NOTICE: (Continued) 
NOTICE:  (Continued) 
If’ your tires have too much air (overinflation), 
you  can get: 
Unusual wear 
Bad  handling 
0 Rough  ride 
Needless  damage from  road  hazards. 
When to Check 
Check your tires once  a month  or more. 
Don’t  forget  your compact spare tire.  It should be  at 
60 psi (420 Pa). 
How to Check 
Use a good  quality pocket-type  gage to check tire 
pressure.  Simply looking  at the tires will not tell you the 
pressure, especially  if  you have radial tires 
-- which 
may  look properly inflated  even if they’re underinflated. 
If  your tires have valve caps,  be  sure to put them  back 
on.  They help prevent leaks  by keeping 
out dirt and 
moisture. 
6-34 
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        Page 259 of 338

Underbody  Maintenance 
Chemicals used for  ice  and snow  removal  and dust 
control  can  collect 
on the underbody. If these are not 
removed,  accelerated corrosion 
(rust) can occur  on  the 
Underbody 
parts such  as fuel  lines,  kame,  floor pan, and 
exhaust  system  even  though they have corrosion 
protection. 
At  least 
every spring,  flush these  materials from the 
underbody with plain  water.  Clean any areas where  mud 
and other debris  can collect. Dirt packed  in closed areas 
of the frame should be loosened before being flushed. 
Your dealer  or am underbody  car washing  system can do 
this for you. 
Chemical Paint Spotting 
Some  weather  and atmospheric  conditions can create  a 
chemical fallout. Airborne pollutants  can 
€dl upon  and 
attack painted surfaces 
on your vehicle. This damage 
can take  two forms:  blotchy,  ringlet-shaped 
discolorations, 
and small irregular  dark spots  etched  into 
the  paint  surface. 
Although  no defect  in the 
paint job causes this, Pontiac 
will  repair,  at 
no charge to the owner,  the surfaces  of 
new  vehicles damaged 
by this fallout  condition  within 
12 months or 12,000 des (20 000 km) of purchase, 
whichever comes first. 
6-46 
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        Page 265 of 338
Right Side Fuse Panel: Additional  fuses  are  located  in 
the relay center, on the far right  side, below the 
instrument  panel. 
You must  remove the sound insulator 
on  the  right  side 
of the  passenger  foot well to replace 
these  fuses. 
Replacing  these  fuses 
is difficult. We recommend  that 
you  see  your  dealer 
if you need  one replaced. 
Position  Circuitry 
1 Door Locks 
2 Power  Antenna,  Lock  Switch 
3 Horns 
4 Not  Used 
5 Cruise  Control, Misc. Engine 
Controls 
6 Fuel  Pump 
7 Injectors 
8 Electronic  Control  Module, 
9 Not Used 
10 Not Used 
11 A/C  Programmer PASS-Key 
@I1 
12 Not Used 
POSITIONS 
r---------- I FUSE I I POSITIONS I 
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