Pontiac Fiero 1988 Service Manual page 640

DRIVEABILITY A N D EMISSIONS - FUEL INJECTION ( P O R T ) 6E3-B-1
SECTION B
SYMPTOMS
TABLE OF CONTENTS
B e f o r e Starting . . . . . . P a g e B-1
Intermittents P a g e B-2
Hard Start . • . . P a g e B-3
Hesitation, S a g , S t u m b l e . * * * P a g e B-3
Surges a n d / o r C h u g g l e P a g e B-4
Lack of P o w e r , S l u g g i s h , o r S p o n g y P a g e B-4
D e t o n a t i o n / S p a r k K n o c k P a g e B-5
Cuts O u t , Misses P a g e B-5
B a c k f i r e . . P a g e B-6
Poor Fuel E c o n o m y P a g e B-6
D i e s e l i n g , R u n - O n P a g e B-6
R o u g h , U n s t a b l e , or Incorrect Idle, S t a l l i n g P a g e B-7
Excessive Exhaust Emissions O r O d o r s P a g e B-7
C h a r t B-1 - Restricted E x h a u s t System C h e c k . P a g e B-8
BEFORE STARTING
Before using this section you should have
performed the DIAGNOSTIC CIECUIT CHECK
and found out that:
1. The electronic control module (ECM) and
"Service Engine Soon" light are operating.
2. There are no trouble codes stored, or there is a
trouble code but no "Service Engine Soon" light.
3. The fuel control system is operating OK (by
performing Field Service Mode Check).
Verify the customer complaint, and locate the
correct SYMPTOM below. Check the items
indicated under that symptom.
If the ENGINE CRANKS BUT WILL NOT
RUN, see CHART A-3.
Several of the symptom procedures below call
for a Careful Visual Check. This check should
include:
• ECM grounds for being clean and tight
• Vacuum hoses for splits, kinks, and proper
connections, as shown on Emission Control
Information label.
• Air leaks at throttle body mounting and intake
manifold.
• Ignition wires for cracking, hardness, proper
routing, and carbon tracking.
• Wiring for proper connections, pinches, and
cuts.
The importance of this step cannot be stressed
too strongly - it can lead to correcting a problem
without further checks and can save valuable time.