Chevrolet Archives - UnderhoodService
Engine Build: Turbocharged Gen V 454 cid Big Block Chevy

Joshua Gomez hot rodded this 454 cid Gen V big block Chevy to the tune of 1,800 horsepower.

Chevrolet Tech Tip: Rough Running Engine, DTC P0300

Some customers may complain of a rough running engine and the check engine light is on. You may find DTC P0300 (Engine Misfire Detected) set along with a misfire and low compression in one or more cylinders.

Diagnostic Dilemmas: From Here To There In A Snow-Plowing Chevrolet

In this installment of Diagnostic Dilemmas, we’re diagnosing idle air control problems by pursuing a no-code, cold-idle speed control condition on a 2002 Chevrolet 2500HD four-wheel drive pickup. Owned by a small local construction company, this U-code, 6.0-liter Chevrolet hauler performs admirably during the summer towing trailers and hauling heavy construction tools in its roomy, all-steel utility bed. During the winter, it plows snow in local commercial parking lots and on private mountain roads. Due to their simplicity and reliability, we still see thousands of these formidable workhorses performing their duties across our great country.

ACDelco Adds Lighting Wiring Harnesses For Millions Of GM Vehicles To Its Aftermarket Portfolio

The tail lamp and headlamp harnesses cover 377 different product applications. The vehicle population includes millions of cars, crossovers and trucks.

Finding The Cause Of Battery Drain In A Chevrolet Impala

Finding the cause of battery drain can be tricky, but sometimes your ears will help you find the culprit.

Holley Announces LS Swap System For Third-Gen GM F-Bodies

Holley announces the release of LS swap components for third-generation Chevrolet Camaros and Pontiac Firebirds. The GM third-generation F-Body has evolved from an oft-forgotten sports car of the 1980s into a capable and budget-friendly platform for hot rodders and racers of all walks of life.

Danger, Will Robinson! Intermittent Loss Of Power

This month’s Diagnostic Dilemma turns the page back to September 10, 2015 when I got a phone call from a local undercar shop inquiring if I had the tools to check the ECM connector pin fit on a 2012 Chevrolet Impala with the flex-fuel, 3.6L gasoline direct fuel injection engine. In response to an intermittent loss of power complaint, the shop had found a technical service bulletin (TSB) indicating that loose PCM connections can cause a loss of fuel pressure on the GDI engine’s high-pressure fuel rail and set codes P00C6 and P228C.

Three lobe cam for fuel pump
Case Study: 1996 GMC 1500 with no temperature control

• No A/C, no vent control, no temperature control • A/C and recirculation buttons will not light up • All new components, including compressor and control head Cars with a little age on them can be temperamental when diagnosing what might seem at first to be an easy problem. This 1996 GMC had already gone

Chevy AC electrical case study
Legendary Spark Plugs: The Six Toughest Vintage Spark Plug Replacements

1. AMC Pacer: The Pacer was supposed to get a GM Wankel rotary engine. If this were the case, the four plugs would have been easy to access. But thanks to emissions problems, the Pacer would get the regular AMC straight six. This forced the engineers to put plugs 5 and 6 under the windshield.

Chevrolet: Navigation Information Not Displaying Accurate Location

Customers may complain the navigation radio is not displaying the correct vehicle location icon on the map accurately after a radio or battery has been replaced or after battery power has been removed from the radio. The vehicle location icon accuracy may be degraded if the GPS signal is not available and the GPS displayed

The Case of the Missing Starter

I was called last fall by a client who owns a heavy-duty diesel shop to diagnose a no-cranking condition on his father-in-law’s 2006 Chevrolet Tahoe. Because his work is mainly with heavy-duty trucks, my client knew he was lacking both in tooling and technical background when he didn’t hear the familiar click of a starter

Diagnostic Dilemmas
Engine Reboot: Chevrolet’s LT1

By Bob McDonald For the past several years, word on the street was that GM would be bringing back the highly recognized RPO code LT1 for 2014. The reason for the comeback was due to more power and efficiency with fewer emissions. At the time of hearing the rumor, thoughts of the 1992 through 1996

Chevrolet LT1 Engine