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Woman's Tough Road Leads To Ownership Of Triangle Tires

Women auto shop owners aren’t rare anymore, but the story of Gina Paschall, owner of Triangle Tires in North Carolina, is definitely unique. According to The News & Observer in Raleigh, NC, Paschall, now 51, became a ward of the state at 5 years...

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Google Your Shop - What Do You See?

Go and enter the name of your shop at Google.com. Try putting quote marks around the name of your shop, like “Main Street Auto Care.” Now try entering the city where you are located with the name of your shop. What did you find? Your shop’s website?...

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Tennessee Shop Offers Discounts To Customers In Need

Price is often the biggest sticking point in an auto repair job. Some customers just have no feel for what certain services or parts cost, others have perhaps been treated poorly in the past (or are cheap), and some just flat out do not have the money....

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Vehicle Unit Increase; Import-Rich VIO Are A Boon for Import Specialists

Need a dose of good news for your business? Then hear this: The influx of new vehicles in the market will lay the foundation for bountiful aftermarket service and repair opportunities. And, with import vehicle sales continuing an ­upward climb, there...

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Honda: Engine Shuts Off, But Power Mode Stays In ‘On’ or ‘Accessory’

Applies To: Honda Insight models with one-push start Customers might complain that when they shift into park and shut off the engine, that the power mode stays in On or Accessory. Honda says the culprit could be a misadjusted shift cable. If the...

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Import Oil Specification Primer

As engine technology has evolved and fuel efficiency standards have tightened, oil specs have increased in importance. Using the wrong viscosity could set a fault code in some applications or interfere with the normal operation of the variable valve...

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10 Alignment Tips to Help You See Past The Angles

1. Talk to the driver. Always ask questions at the time the vehicle is written up. Find out why customers think they need an alignment. 2. Take notes. Nothing is worse than a repair order that just says “perform alignment” or “needs alignment.”...

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What to Know About Modern Air Ride Systems

GM, Ford, BMW and just about every other manufacturer has a 10-year-old vehicle on the road with an air ride suspension at the rear or at all four corners. These systems could be as exotic as a Land Rover Defender or as common as a Ford Explorer....

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Slipping Clutch: Improper Flywheel Step and Cup Dimensions

Slipping is one of the most common clutch related concerns. A slipping condition can occur after years of service or immediately after installation of a new clutch and is caused by various scenarios. One of the most commonly seen and easily prevented...

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Hunter Releases New Technical and Training-Specific Channel on YouTube

Hunter Engineering Company has launched a new technical and training channel on YouTube, called the Hunter Learning Channel. The Hunter Learning Channel features extensive training video playlists for every product category manufactured by Hunter....

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Ingersoll Rand Becomes ‘Official Power Tools of NASCAR’

NASCAR and Ingersoll Rand have announced a multi-year partnership designating Ingersoll Rand as the “Official Power Tools of NASCAR.” The multi-faceted agreement also designates Ingersoll Rand as an Official Partner of the International Motorsports...

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2015 Vehicle Lifting Points Guide Now Available

The Automotive Lift Institute, Inc. (ALI) announces the availability of the 2015 edition of ALI’s “Vehicle Lifting Points for Frame Engaging Lifts.” This updated guide is a quick-reference single-source manual for lifting point information as...

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Home Cooling Tech Feature: Straight Up Look at the Vortec 3500 Straight-Five Engine

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these engines are interference engines with tight valve-to-piston clearances, so accurate cam timing is absolutely essential. The cam phaser on the front of the exhaust cam can retard exhaust valve timing from 0 to 25 degrees.

At idle, it is in the fully advanced position, and must be installed in this position to prevent the exhaust valves from hitting the ­pistons.

Changing the timing chain requires using a J44221 Cam Holding Tool (or equivalent) to keep the cams from moving when the chain is taken off.

The basic procedure is to remove the intake and exhaust cam position sensors, remove the front cover, rotate the crankshaft so number one piston is at TDC (top dead center), install the cam holding tool, then release tension on the timing chain by moving the tensioner shoe in.

idle problems caused by dirt or fuel varnish in the throttle body can be removed with throttle cleaner. Use a tee to lock the tensioner in place, remove the cam phaser from the exhaust cam, then the sprocket from the intake cam, and finally the crank sprocket (all three sprockets should be replaced along with the timing chain).

Every seventh link on the timing chain is darkened to aid in aligning the timing marks. After installing a new sprocket on the crankshaft, align one of these marks on the chain with the mark on the sprocket (which should be at the 5 o’clock position).

Align another dark link on the chain with the timing mark on the intake cam sprocket (1 o’clock position). Then install the cam phaser on the exhaust cam. T

he word “Delphi” should be level and parallel to the seam on the head, and the cam phaser must be in the fully advanced position. Align another dark link on the chain with the mark on the exhaust sprocket (which should be at the 11 o’clock position).

Remove the tee from the chain tensioner and make sure all of the timing marks are correctly aligned.

starter icing issues eliminated — the vortec 3500 is fitted with a new vented starter solenoid. the solenoid case has a micromesh-covered vent that protects the solenoid from debris particles but prevents moisture buildup. when the engine is warm, any moisture on the solenoid evaporates through the vent. the vented solenoid virtually eliminates the possibility of cold-start problems associated with solenoid icing.Sensors
These engines use a single magnetic crank sensor mounted in the block near the back of the engine, and a pair of camshaft sensors mounted in the front of the cylinder head to monitor crankshaft position and cam phasing.

If the crank sensor, either cam sensor or the PCM (Powertrain Control Module) on one of these applications has to be replaced for any reason, you must perform a CKP System Variation Learn Procedure using a Tech 1 or similar scan tool.

It’s the same procedure that’s required on many other GM engines so the PCM can learn the relative positions of the crank and cam sensors. If the procedure is not performed, the engine may not run properly or may not start.

The 2004 version of the 3500 came with two knock sensors. Knock protection was deemed critical on these engines because of their high compression ratio (10:1) and use of regular 87 octane fuel.

But improved PCM programming allowed GM to discontinue the second knock sensor in 2005. The remaining knock sensor is located on the left side of the engine between cylinders number 3 and 4.

Inputs for fuel management are provided by a mass airflow (MAF) sensor mounted ahead of the electronic throttle body, a manifold absolute pressure (MAP) sensor on the intake manifold and a throttle position (TPS) sensor on the throttle.

A buildup of dirt or fuel varnish on the MAF sensor may cause lean codes to set. Cleaning the MAF sensor with aerosol electronics cleaner can often correct this kind of problem. Idle problems caused by dirt or fuel varnish in the throttle body can be removed with throttle cleaner.

Maintenance
Starting in 2004, the recommended oil for the 2800, 3500 and 4200 engines is 5W-30 that meets GF-4 specifications. The crankcase oil capacity is six quarts.

GM uses its Oil Life Monitor System on these applications to indicate when it’s time to change the oil.

Based on vehicle usage, temperature, run time, vehicle speed, load and so on, the estimated oil change interval may vary from as little as 3,000 miles to as much as 15,000 miles.

We think pushing the oil change interval much beyond 7,500 miles with any oil other than a top quality full synthetic is asking for trouble.

The Chevy Colorado and GMC Canyon both have conventional fuel filters located outside the fuel tank that can be replaced on an “as needed” basis. GM offers no recommended service interval for the filter.

The serpentine belt likewise has no recommended replacement interval. Most belts are good for 100,000 miles, but need to be inspected to check for wear and proper tension. Belt noise and/or accelerated wear can be caused by pulley misalignment. GM TSB 08-06-01-006A says to use a laser pulley alignment checker if you suspect belt noise or wear may be due to misalignment of the power steering pump pulley.

The original equipment spark plugs have a 100,000-mile replacement interval (gap is 0.042”).

Inspect the engine air filter every 15,000 miles and replace as needed. The Chevy Colorado and GMC Canyon are not equipped with a cabin air filter.

The Dex-Cool coolant is a five-year/150,000-mile coolant. Most trucks will reach five years before the odometer hits 150,000 miles, so recommend changing the coolant after five years of service. Waiting longer increases the risk of damaging coolant corrosion and expensive cooling system repairs. 

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Larry Carley

Larry Carley has more than 30 years of experience in the automotive aftermarket, including experience as an ASE-certified technician, and has won numerous awards for his articles. He has written 12 automotive-related books and developed automotive training software, available at www.carleysoftware.com.

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