Misfire Case Studies

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Misfire | 1999 Chevrolet 3500 Express Van | 5.7

Chevy V8 Misfire Caused by Excessive Cam Retard This Chevy 1 Ton Van came in for an intermittent misfire complaint. The misfire ...
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1996 Chevrolet Cam & Crank Alignment

Poor Idle | 1996 Chevrolet Corsica 2.2 | Crank & Cam Alignment

Having the internet is a great resource for anything you want or need to know. As an automobile technician it ...
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2000 Lincoln LS Engine

Misfire | 2000 Lincoln LS | COP Coil Testing

How many times have you tried to find the misfiring cylinder on a Ford COP (Coil On Plug) ignition system ...
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3.8 | Crank Sensor Signal

Dead Coil | 1994 Oldsmobile Delta 88 Royale | 3.8

Crank Sensor Causing Coil Not to Fire This 1994 Oldsmobile Delta 88 Royale 3.8 liter had many issues but I was ...
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Misfire | 1998 Chevrolet Malibu | 3.1

Using Data PIDs to Diagnose Stuck Open EGR Valve on a 3.1 Have you ever had a car come in ...
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Lean Condition | 2003 Chevrolet Tahoe | 5.3

Cold Start-Up Misfires - 2003 Chevrolet Tahoe  5.3 This case study will involve a couple different and effective ways that I ...
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1996 4.3 Worn Distributor Bushing

Misfire Under Light Load 2000 – 2500 RPM| 1996 Chevrolet Blazer | 4.3

Misfire Caused by Distributor Bushing Failure This case study is on a 1996 Chevrolet Blazer with a 4.3 V6. The ...
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3000 RPM Rev Limiter, Mysterious Issues | 2003 Lincoln LS | 3.9

Intermittent Electronic Throttle Control (ETC) Safety Mode While Driving We have all been dealing with gasoline engine ignition misfires since ...
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Misfire | 1995 Chrysler Town & Country | 3.8

Upside Down Crank Sensor Pattern Causes Misfiring Engine Over 2000 RPM This case study is on a 1995 Chrysler Town ...
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Misfire | 1999 GMC Safari Van | 4.3

Defective New Crank Sensor Produces Tiny Signal Glitch and Causes Misfires My first case study is on a 1999 GMC Safari ...
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No Start Case Studies

Intermittent No Start, No Communication, Flashing Theft Light | 2010 Ford F250 | 6.4 Powerstroke Diesel

Intermittent Network Communication Problem - Diagnostic Deduction Customer Concern Vehicle was dropped from a  hoist and now has a intermittent ...
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No Start, No Spark | 1997 Chrysler Sebring | 2.5

No Spark Caused by a Shorted Ignition Coil  This 1997 Chrysler Sebring with a 2.5 liter came in as a ...
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No Start, No Fuel Pump | 1997 Oldmobile Bravada | 4.3

Missing 12 Volt Power from Burnt Ignition Switch This 1997 Oldsmobile Bravada came in as a no start. Turn the ...
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No Start, Theft Issue? | 1992 Cadillac Eldorado

This case study took an unexpected turn that could only happen in certain areas of the country. The vehicle in this ...
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GM Key Lock Cylinder Tumblers Disassembled

GM’s Theft Code B2960 | Key Code Incorrect but Valid

General Motor's Theft No Crank/No Start Security Relearn I am sure many of you have had a GM towed in ...
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Fuel Trim Control

Lean Condition | 2003 Chevrolet Tahoe | 5.3

Cold Start-Up Misfires - 2003 Chevrolet Tahoe  5.3 This case study will involve a couple different and effective ways that I ...
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Theft & Security

Intermittent No Start, No Communication, Flashing Theft Light | 2010 Ford F250 | 6.4 Powerstroke Diesel

Intermittent Network Communication Problem - Diagnostic Deduction Customer Concern Vehicle was dropped from a  hoist and now has a intermittent ...
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No Start, Theft Issue? | 1992 Cadillac Eldorado

This case study took an unexpected turn that could only happen in certain areas of the country. The vehicle in this ...
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GM Key Lock Cylinder Tumblers Disassembled

GM’s Theft Code B2960 | Key Code Incorrect but Valid

General Motor's Theft No Crank/No Start Security Relearn I am sure many of you have had a GM towed in ...
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Electrical

Intermittent No Blower Motor Operation | 2005 Chevrolet Impala | 3.8

No Heat and It Is -10 Below Zero in Wisconsin Customer Concern Vehicle has no heat from air ducts. The ...
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Intermittent No Start, No Communication, Flashing Theft Light | 2010 Ford F250 | 6.4 Powerstroke Diesel

Intermittent Network Communication Problem - Diagnostic Deduction Customer Concern Vehicle was dropped from a  hoist and now has a intermittent ...
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Chevy Trailblazer Defective Ignition Switch

Intermittent Electrical Issue | 2004 Chevrolet Trailblazer

Intermittent Bad Ignition Switch Causes Low Power and No Blower Motor This 2004 Chevy Trailblazer came in with multiple concerns ...
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1996 Chevy Blazer 4wd Module Scope Pattern

4WD Issue | 1996 Chevrolet Blazer

Intermittent 4WD Module Problem - 1996 Chevrolet Blazer This case study will be pretty short and is just a nice example ...
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Interior Electrical Issues | 1997 Buick LeSabre

Lighting Problems Caused by Common Body Control Module Corrosion This case study is about a 1997 Buick LeSabre that has a ...
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Parasitic Battery Draw | 1990 Ford F150

This 1990 Ford F-150 had a parasitic draw that was draining the battery. The first step I take in finding ...
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Shift Issue | 1993 Chevrolet Lumina | 4T60E

New Transmission Not Wired the Same as the Old This 1993 Chevrolet Lumina came in with a transmission shifting complaint ...
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No Start, No Fuel Pump | 1997 Oldmobile Bravada | 4.3

Missing 12 Volt Power from Burnt Ignition Switch This 1997 Oldsmobile Bravada came in as a no start. Turn the ...
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No Start, Theft Issue? | 1992 Cadillac Eldorado

This case study took an unexpected turn that could only happen in certain areas of the country. The vehicle in this ...
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3000 RPM Rev Limiter, Mysterious Issues | 2003 Lincoln LS | 3.9

Intermittent Electronic Throttle Control (ETC) Safety Mode While Driving We have all been dealing with gasoline engine ignition misfires since ...
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GM Key Lock Cylinder Tumblers Disassembled

GM’s Theft Code B2960 | Key Code Incorrect but Valid

General Motor's Theft No Crank/No Start Security Relearn I am sure many of you have had a GM towed in ...
Read More

Communication & Networks

Intermittent No Start, No Communication, Flashing Theft Light | 2010 Ford F250 | 6.4 Powerstroke Diesel

Intermittent Network Communication Problem - Diagnostic Deduction Customer Concern Vehicle was dropped from a  hoist and now has a intermittent ...
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Airbag Light | 1996 Pontiac Grand Am | No Communication

No Airbag Module Communication - 1996 Pontiac Grand Am This will be a quick and to the point case study. This ...
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Diesel

Intermittent No Start, No Communication, Flashing Theft Light | 2010 Ford F250 | 6.4 Powerstroke Diesel

Intermittent Network Communication Problem - Diagnostic Deduction Customer Concern Vehicle was dropped from a  hoist and now has a intermittent ...
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Dodge Diesel | Plugged Cummins Airfilter

No Power | 2005 Dodge Ram 2500 | 5.9 Cummins Diesel

Cummins Diesel With No Power - 2005 Dodge Ram 2500 Customer complaint was severe lack of power and performance on this ...
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Transmission

Shift Issue | 1993 Chevrolet Lumina | 4T60E

New Transmission Not Wired the Same as the Old This 1993 Chevrolet Lumina came in with a transmission shifting complaint ...
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Other Diagnostic

Very Few Plugged Fuel Filters Cause Problems

Automotive Fuel Filter Driveability Problems

Fuel Filters Rarely Cause Driveability Problems This is not really a case study but more of a thought of mine ...
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1996 Chevrolet Cam & Crank Alignment

Poor Idle | 1996 Chevrolet Corsica 2.2 | Crank & Cam Alignment

Having the internet is a great resource for anything you want or need to know. As an automobile technician it ...
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Dodge Diesel | Plugged Cummins Airfilter

No Power | 2005 Dodge Ram 2500 | 5.9 Cummins Diesel

Cummins Diesel With No Power - 2005 Dodge Ram 2500 Customer complaint was severe lack of power and performance on this ...
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Rough Running | 1992 Toyota Celica

Every once in awhile you get a vehicle that has had too many hands working on it. This 1992 Toyota Celica ...
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3000 RPM Rev Limiter, Mysterious Issues | 2003 Lincoln LS | 3.9

Intermittent Electronic Throttle Control (ETC) Safety Mode While Driving We have all been dealing with gasoline engine ignition misfires since ...
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