Crankshaft And Camshaft Signals
The key to diagnosing many cranking, no-start and stalling problems found on the late-model import is to understand how the crankshaft and camshaft position sensors function and what their mechanical relationship is to each other.
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.
VIDEO: Head Lift On Production Engines
Andrew Markel explores the damaging phenomenon known as “head lift” appearing in production engines, and how proper maintenance can keep it under control. Sponsored by Auto Value and Bumper to Bumper.
Understanding Misfire Events And Causes
When a spark plug fires, it is not an instantaneous ignition of all the molecules of air and fuel. When the spark kernel jumps between the two electrodes, the piston might be some distance from the top of the cylinder (this is usually described as degrees of crankshaft rotation).
VIDEO: Ford And Chrysler Oil Specifications
Andrew Markel discusses oil specification and weight, specifically those issued by Ford and Chrysler for their vehicles. Sponsored by Auto Value and Bumper to Bumper.
JASPER Now Offers Remanufactured GM 2.4L Ecotec OHC Engine
JASPER announces the availability of the GM 2.4L Ecotec Direct Injection and Port Injection engines. The engines are covered by a 3-Year/ 100,000-mile nationwide, transferable, parts and labor warranty.
Demystifying Scopes: Engine Camshaft And Crankshaft Waveforms
Having to remove valve or front cover of an engine to check engine timing marks can rarely be completed in under an hour on most modern engines. But, capturing the waveforms from the camshaft and crankshaft sensors can be completed in under 30 minutes. This diagnostic approach can also diagnose circuit and sensor problems.
VIDEO: Thermostats And Oil Sludging
Andrew Markel explains how improper temperature control in the engine can lead to oil sludging in the valvetrain. Sponsored by MAHLE.
MLS Gasket Update
The days of getting away with composition gaskets in extreme combustion situations were back when the deck surfaces on blocks and heads were thick and strong, and the heads were clamped with 5-6 head bolts per cylinder. However, all that changed when car makers became extremely weight conscious for MPG reasons and they started removing material out of blocks and heads.
The No-Code Conundrum: The Art Of Diagnosing What The PCM Can’t See
Doing mobile diagnostics, I obviously get more than my share of no-code driveability problems. Case in point, I was asked by a client shop to “take a quick look” at a stalling complaint on a 2003 Ford Explorer with a cable-operated throttle.
Air Management For The FSI V6 And V8 Engines
The FSI 3.2 L V6 and 4.2 L V8 have a lot in common with the FSI 2.0 L four-cylinder engine, including carbon deposit problems. Chances are your first exposure to an Audi intake manifold will not be a driveability complaint, but rather a carbon cleaning service where the intake valves need to be cleaned.
Manley Performance Introduces New 2018 Catalog
New products and applications have been added to the 2018 catalog by internal engine components manufacturer Manley Performance. The publication has increased in size to 180 pages, even though products for sport compacts now reside in a stand-alone catalog.
