Pontiac Fiero 1988 Service Manual page 510

DRIVEABILITY A N D E M I S S I O N S - F U E L INJECTION (TBI) 6E2-B-1
SECTION B
S Y M P T O M S
TABLE OF CONTENTS
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I PI "term
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Page B~3
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Detonation/Spark Knock «©©©©©©©©o©e9oe©©«©©©»»«o©©©o©ooo©©©©©©9©©©©«©©©«©o©*©
Page
Hesitation, Sag, Stumble ©©©•©•©©©©©••©•©•©•©©••©©•©©©•••©•©««©©©e©e»©©©««»«©©© Page B"°4
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i sses
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Page
B - ^
Poor Pu el Economy ••••©••©•••©©•©©©©•©••©©©•©©©•©©•©©©©©©ooo©©©©©©©©©©©©©©©© Pa g e B ™ 5
Rough, Unstable, or Incorrect Idle, Stalling ©©•.©©©•©.•©©©.•©©«©©©.©©©..©«©•©©©©©•.. Page B-5
Excessive Exhaust Emissions or Odors ©©•©©.©©©©©©©©©•©©«.©©©©.©©©©•©©©.©©•.•« Page B-6
(31 esel
i
ng, Run-*On
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Page
B-6
Backfire Page B-6
BEFORE STARTING
Before using this section you should have
performed the DIAGNOSTIC CIRCUIT 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 following symptom procedures
call for a careful visual (physical) check.
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.
This check should include:
® 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 following symptoms cover several engines.
To determine if a particular system or component is
used, refer to the ECM wiring diagrams for
application.