GMC S Series 1994 Repair Manual Download

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N O T IC E : U p p e r a n d l o w e r O - r in g s m u s t b e

i n s t a l le d b e f o r e i n je c t o r s o r i m p r o p e r s e a t in g

o f l a r g e O - r in g c o u ld c a u s e f u e l to le a k .

• Injector, aligning raised lug on each injector base

with notch in fuel meter body cavity.

• Push down on injector until it is fully seated in fuel

meter body (figure 4).

• Electrical terminals of injector should be parallel

with throttle shaft.

FUEL METER COVER

-►4-

Install or Connect (Figure 2)

1. New fuel meter outlet passage gasket, and cover

gasket.

2. Fuel meter cover assembly.

N O T IC E : R e f e r to “ N o t i c e ” o n p a g e 6 C 1 -1 .

3. Attaching screw assemblies, precoated with Loctite

262 (P/N 10522624) or equivalent to the threads.

(Short screws are next to injectors.)

Tighten

• Screw assemblies to 3 N-m (28 lbs. in.).

THR O TTLE PO SITIO N SENSOR

(TP SENSOR)

Install or Connect (Figure 2)

-►4-

1. TP sensor seal over throttle shaft as shown in fig

ure 2.

2. W ith throttle valve in normally-closed position,

install TP sensor on throttle shaft and rotate coun

terclockwise to align mounting hole.

N O T IC E : R e f e r to “ N o t i c e ” o n p a g e 6 C 1 -1 .

3. TP sensor attaching screw assemblies, precoated

with appropriate thread-locking compound.

Tighten

• Screw assemblies to 2 N-m (18 lbs. in.).

IDLE AIR CONTROL VALVE

N O T IC E : S i n c e t h e I A C v a lv e w a s r e m o v e d

d u r in g s e r v ic e , it s o p e r a t io n s h o u l d b e t e s t e d

e l e c t r i c a l l y w it h t h e I A C / I S C M o t o r T e s t e r

( J 3 7 0 2 7 o r B T - 8 2 5 6 K ) . H o w e v e r , i f t h e v a lv e

p i n t l e i s e x t e n d e d e le c t r ic a lly , i t m u s t a ls o b e

r e t r a c t e d e le c t r ic a lly . B e f o r e i n s t a l li n g a n IA C

v a lv e , m e a s u r e t h e d is t a n c e b e t w e e n th e tip

o f t h e v a lv e p in t l e a n d t h e m o u n t in g s u r f a c e

( “A ” in f ig u r e s 5 a n d 6 ). i f t h e d im e n s io n is

g r e a t e r t h a n 2 8 m m ( 1 .1 0 i n c h e s ) , i t m u s t b e

r e d u c e d to p r e v e n t d a m a g e to t h e v a lv e . T h is

m a y b e d o n e e l e c t r i c a ll y u s in g a n I A C /IS C

m o t o r t e s t e r ( J 3 7 0 2 7 o r B T - 8 2 5 6 K ) o r m a n u 

a l l y b y e x e r t in g f ir m p r e s s u r e w ith a s lig h t

p i d e - t o - s i d e m o v e m e n t o n v a l v e p i n t l e to

r e t r a c t i t ( f ig u r e 5 o r 6).

Important

No physical adjustment of the IAC valve assembly is

required  after  installation.  The  IAC  valve  pintle  is  reset
by  turning  the  ignition  “ ON”  for  ten  seconds  and  then
“ OFF.”  The  ECM/PCM  then  resets  the  pintle  to  the  cor
rect  position.  Proper  idle  regulation  should  result.

GMC S Series 1994, Repair Manual

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