pep boys mech fuel trims 10 2014

Fuel Systems: Central Port Injection (CPI) and Central

Sequential Fuel Injection (CSFI)

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Pep Boys Advanced Technical Training

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Q4

Mechanic Training Series 2014

Available Now At Learning

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Should Have Viewed

Wednesday October 1st 2014

Make Up Date Tuesday October 7th 2014

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Guidelines

Fuel System Testing and Diagnosis (CPI) Central Port Injection and (CSFI) Central Sequential Fuel

Injection

With Throttle Body Service

Pep Boys Advanced Technical Training

As you complete this course, you will be able to:

Objectives

• Understand CPI and CSFI Fuel Systems And “Real World” Testing Techniques.

• Quickly And Accurately Diagnose CPI and CSFI Fuel System Problems

• Maintain Fuel Systems For Best Efficiency

CPI: Central Port Injection

Injector Location (Spider)

Fuel Injector

Fuel Return Line Fuel Pressure Line

Fuel Pressure Regulator

Fuel Line’s Inlet and Outlet

Fuel In

Fuel Return

CPI Assembly

Fuel Injector V6

1 Fuel Injector

1 Fuel Pressure Regulator

6 Poppets

6 Fuel Injector Lines

How does it work?

Fires All Poppets At Once

Poppet Injector

Fuel Injector Line

Spring

Ball Valve and Seat

Fuel Pressure

Opens Poppet To Allow Fuel Through

Maxi Injector

• 1.5 – 2.1 ’s

• 4 amps peak

• 1 amp hold

Injector Connector

Fuel Injector Connector

Power From Fuse On Pink /

Black Wire

Control From PCM On Dark

Blue Wire

Injector Wiring

Power From Fuse On Pink /

Black Wire

Control From PCM On Dark

Blue Wire

Injector Pattern (Peak and Hold)

Probe is set to 200mv/2a

14 v Power At PCM Terminal

PCM Grounds Dark Blue

Wire

Current Ramps Up To 4 amps

Currents Peaks At 4

Amps

(Peak and Hold) Continued

Probe is set to 200mv/2a

PCM Holds Injector On

Current Is Limited To 1 Amp During Hold Section

Injector Turns Off

Current Goes Back To 0 amps


• Mounted on the CPI unit

• Vacuum comes from engine

• Should maintain

– 58 psi to 60 psi cranking

– 52 to 54 psi running


Fuel Pressure Regulator Vacuum Port

Fuel Pressure Specs

• FUEL PUMP TESTING(KOEC): 58-60 Minimum(KOER): 52-54(Deadhead): 75-100 Psi

• Volume: Minimum 1 Pint In 30 Seconds

• Must Hold Rest Pressure

Fuel Pump Current Draw

Ground

Each Division = 2 Amps

Fuel Pump Current Draw 8 – 10 Amps

CPI: Central Port Injection

Customer Complaint Very Hard To Start or No Start

Spark OK

Where to start???????

•Fuel Pressure 1st!!!

Checking Fuel Pressure

Fuel Pressure Test Port

Fuel Pressure Return Line

58 psi Minimum

Should Hold Rest Pressure

Check Fuel Pressure Cranking

52 PSI Cranking

There Is Fuel Pressure: Is It

Enough?

Fuel Pressure Specs

• FUEL PUMP TESTING(KOEC): 58-60 minimum(KOER): 52-54(Deadhead): 74-100 psi

• Volume: 1 Pint In 30 Seconds

Testing Fuel Pressure

52 PSI Cranking

Testing Dead Head Fuel Pressure

54 PSI Cranking

Crimp Off Return Line

Dead Head At Filter

54 PSI Cranking

Confirm Good Power And Ground To Pump And Acceptable Voltage Drop Of

.5 volts Or Less

Fuel Gauge At Inlet To Filter

1st Poll Question

1st Poll Question

Central Sequential Fuel Injection (CSFI)

4.3L, 5.0L and 5.7L

CSFI Location

Under Upper Manifold

CSFI Connector

Fuel Lines Wiring To Injectors

CSFI Injector Assembly

CSFI Assembly

CSFI Tubes

CSFI Fuel Pressure Regulator


O-Ring Seal

Replaceable Regulator


Fuel Pressure Regulator Retainer


CSFI Assembly Removed

Fuel Lines Attach

8 Individual Injectors

8 Individual Poppets

8 Individual Hoses

Fuel Injector Pins

Each 2 Pins Is One Injector

Each Injector Has A Resistance Of

12 Ohms

Injector #2 Injector #4 Injector #3

Injector #1

Injector Numbering Cylinder 1,2,3,and 4

Injector Numbering Cylinder 5,6,7,and 8

Injector #7Injector #5 Injector #6

Injector #8

Injector Assembly V8

8 Injectors

8 Poppets

1 Regulator

8 Hoses

Replaceable Injectors

Each Injector Is Individually Replaceable

A Single Injector and Poppet Assembly

IndividualInjector

IndividualPoppet

Cover Removed

Remove Cover and Test HERE

Pin ABlack / WhitePin F

Black

Injector Wiring

Power Feeds To All 6 Injectors Are Pink

Ground Control Wires Differ In Color

Current Probe is set to 100mv/1a

Injector Pattern (Saturated Switch)

Power At PCM

PCM Grounds Control

Wire

Current Ramps Up To 1 Amp

PCM Releases Ground

Current Goes To 0

Amps

Fuel Pressure Testing

Key On Engine

Cranking 62 PSI

Fuel Pressure Specs

• FUEL PUMP TESTING(KOEC): 60-62 Minimum(KOER): 54-57(Deadhead): 75-100 Psi

• Volume: Minimum 1 Pint In 30 Seconds

• Must Hold Rest Pressure

CSFI Misfire 5.7L V8

Customer Complaint Misfiring and Check Engine Light On

P0300: Random Misfire

Misfire Counter Shows Cylinders #2 and #7 Highest Counts

Multiple TSB’s For Sticking Injectors

Using VERUS To Test Injectors

Injector Balance With VERUS

Each Injector Can Only Be Pulsed Once Per Ignition

Cycle

Pick An Injector

As You Pulse Each Injector The Option To Pick It Again

Will Disappear

Scan Tool Energizes Fuel Pump

Scan Tool Has PCM Prime The Fuel Pump To

KOEO Reading Record The Start Reading

Scan Tool Pulses Injector

Scan Tool Has PCM Pulse

Each Injector The Same Amount Of

Time

Watch Pressure Drop and Record It

Cyl 1 Dropped To 48 psi








PCM Will Energize Fuel Pump In Between Each Injector Pulsing

Starting Pressure Is 62 Psi

8 Individual Injectors Can Be Changed

Injector Can Only Be Cleaned Or

Replaced

V8 Engines Have 8 Individual Injectors

Poll Question #2

Poll Question #2

TSB 00-06-04-003B

Cleaning Works Temporarily

• Sticking Poppet Valves Causing Misfires

– Verify Problem

– Injector Cleaning (GM # 12345104)

• Replace Assembly With Updated Part

CSFI Injectors

CFSI Style Injectors

CSFI Style Poppets

Multec 2 Injectors Moved From Inside Assembly To End

Of Tube

Plastic Protector To Reduce Build

Up

Multiport Flexible Injector Assembly (MFI)

Injector Tubes Must Be Routed Properly

1) Cylinders 6 and 8

2) Fuel Pressure Regulator




Routing In TSB

MFI Assembly Installed

Updated MFI Assembly

Maintaining Fuel Systems

• Engine Performance Warning Signs

– Loss Of Power

– Gas Mileage Drops

– “Knocks or Pings” On Acceleration

– Stalling

– Hard Starting

– Engine Runs Rough

Fuel System Cleaner

Adding Fuel System Cleaner

Helps Maintain The Entire Fuel System

Throttle Bodies and Induction Service

Vacuum Supply For PCV System

EGR Tube For EGR System

Induction Cleaning

Attached To Vacuum Port

Slowly Add Till Bottle Is Empty

Cleans Intake Manifold, Carbon From Valves, Carbon From Combustion Chambers and Carbon From

Pistons

Carbon Build Up On Valves

Carbon Build Up On Valve

Clean Valve

Dirt Builds Up On Plate and On Throttle Body

Surging, Low Idle, Stalling At Stop

Cleaning

If Dirty, But Not Extremely Dirty

Throttle Body Can Be Cleaned Using Proper

Spray Cleaner

Spraying While Holding RPM’s Up

After Cleaning

Using Spray Cleaner With Engine Running

Throttle Body Removed

If Extremely Dirty More Than Spray May Be

NecessaryCan Be Cleaned Using Rag, Sponge or Small

Brush

After Cleaning

After Cleaning

Cleaning The Throttle Body Can Fix:

SurgingLow Idle

Stalling At Stop

Fuel Injector Cleaning

Dirty Injector Clean Injector

Poll Question #3

Poll Question #3

Summary

• Understanding CPI and CSFI Systems Can Speed Diagnostic

Time and Accuracy

• Understanding Fuel Pressure As It Relates To CPI and CSFI

Systems Helps To Accurately Find and Quickly Repair Drivability

Problems.

•Fuel System Maintenance Keeps The Vehicle Running At It’s Peak

Performance

Q and A session

• Q and A session is voluntary

• Questions are repeated to whole group anonymously

• No names attached to the questions

• Questions on this technical topic only

79

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Fuel Systems

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pep boys mech fuel trims 10 2014

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