AfterMarketNews Auto Care Pro AutoProJobs Auto-Video.com Brake&Frontend BodyShopBusiness Counterman EngineBuilder Fleet Equipment ImportCar Motorcycle & Powersports News Servicio Automotriz Shop Owner Tire Review Tech Shop Tomorrow's Tech Underhood Service

Raybestos Partners With Schwartz Performance To Restore Classic '69 Mustang Fastback

Raybestos has joined forces once again with Schwartz Performance to restore an American icon muscle car: a 1969 Ford Mustang Fastback. “Raybestos and Mustang are the perfect match of history, leadership and innovation. Working with the first-class...

Read more...

Top 10 Brake Job Mistakes For Pads, Rotors And Calipers

Here are the top 10 brake job mistakes made by rookie technicians when replacing brake pads, rotors and calipers.   10. Not cleaning the brake slides and hardware: Just slapping new pads where the old pads once resided never works. The...

Read more...

Snap-on Brightens Up Your Workspace With New Rechargeable Shop Light

Get out of the dark and brighten up your workspace with the new Snap-on ECFBAR300 Rechargeable Shop Light. With an innovative Chip-On-Board LED efficiently delivering more light while maximizing battery power, this powerful shop light is ideal for use...

Read more...

Customer Loyalty to Vehicle Brands Spells Ongoing Maintenance Opportunities

Vehicle owners’ allegiance to brands should give us all something to cheer about. This is especially true for those of you who service import vehicles. Nine import nameplates — Infiniti, Land Rover, Lexus, Mazda, Mitsubishi, Nissan, Porsche, Subaru...

Read more...

The Element of Trust And Its Impact on a Repair Scenario

Trust: It’s an important word, and it’s one I hear a lot behind the counter at the shop. “I know you’ll treat me right because I trust what you do,” is the general sentiment. But I’ve always wondered how deep that level of comfort goes...

Read more...

Servicing Mercedes-Benz AIRMATIC Suspensions

The Mercedes-Benz AIRMATIC suspension system was introduced in 1999 on the S-Class and has subsequently been used on the E-Class and most of the automaker’s SUVs. The system employs electronically controlled air springs that provide an ideal balance...

Read more...

Regulators Launch Investigation Into Jeep Grand Cherokee Brake Defect

Federal regulators are investigating whether the automatic braking systems in some 2014 Jeep Grand Cherokees may be defective after receiving a number of complaints from motorists about a potentially dangerous glitch that caused their vehicles to come...

Read more...

Electronic Proportioning Valve: Doing More With Less Hardware

Anti-lock brake systems (ABS) and the HCU are replacing proportioning, combination and other valves to change the braking forces in the front and rear. This is called Electronic Brake Distribution (EBD) and it can dynamically change the proportioning...

Read more...

NHTSA’s GM Brake Line Corrosion Investigation: Reading Between the Brake Lines

There will be no recalls on some GM vehicles for brake line corrosion. Instead, we received an advisory from the National Highway and Traffic Safety Administration (NHTSA) about brake line inspection and car washes. What was not discussed was the corrosion...

Read more...

Hunter's Social Media Contest Includes Trips to SEMA 2015

Hunter Engineering has launched a new, two-part social media contest that offers trips to SEMA 2015 and the chance to win a free SmartWeight Touch wheel balancer at the show. Before SEMA, two shops can win a trip for two to SEMA 2015 by following Hunter...

Read more...

Ingersoll Rand's 'Real Work Real Play' Sweepstakes With Gas Monkey Garage And NASCAR Rewards A Tool User With The Ultimate Fan Weekend

Ingersoll Rand, the Official Power Tools of NASCAR and a preferred tool provider for Gas Monkey Garage, has announced the “Real Work Real Play” sweepstakes to reward automotive fans who “get it done” with a weekend of fun. Ingersoll Rand is working...

Read more...

Bosch Relaunches Boschdiagnostics.com With Mobile-Responsive Design, New Layout For North America

Bosch has announced the re-launch of boschdiagnostics.com in North America, continuing to update all of its sites to a mobile-responsive, intuitive design. The URL contains three separate sites, featuring DIY diagnostic tools (DIY), professional diagnostic...

Read more...

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

Print Print Email Email

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. 

The following two tabs change content below.

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.
  • Mike

    I’m having problems taking off the front engine cover on my 2005 gym canyon 3.5. The book says to remove the oil pan. Is there a oil pump tube or something attached the the front cover cause i cant get it off?

    • Mydriasis

      Yank it.

Latest articles from our other sites:

Ten Vehicles Vying For $5,000 Grand Prize In Champion 'King Of The Road' Contest

It’s time for fans of Federal-Mogul Motorparts’ Champion Spark Plug brand to cast their votes to name the grand-prize winner of the Champion “King of the Road” contest. Enthusiasts can vote for...More

Yokohama Tire Corp. Kicks Off Its 'Summer Joyride 2' Promotion

Yokohama Tire Corp. (YTC) has announced a new promotion with “Summer Joyride 2.” The promotion, which runs until Aug. 31, offers customers a $60 Visa prepaid card after purchasing a set of four select...More

Mazda Miata Awarded Top Honor by J.D. Power Survey

The third-generation Mazda MX-5 Miata is finishing up its model run on a high note, as it was recently awarded top honors in its segment for J.D. Power’s annual Initial Quality Survey (IQS) for the sixth...More

Customer Loyalty to Vehicle Brands Spells Ongoing Maintenance Opportunities

Vehicle owners’ allegiance to brands should give us all something to cheer about. This is especially true for those of you who service import vehicles. Nine import nameplates — Infiniti, Land Rover,...More

Chrysler Tech Tip: Stability Control System Engages Prematurely

Problem:  ESP system may prematurely activate momentarily when negotiating a curve or MIL illumination due to diagnostic trouble code P0340, P0344 or P0116. Overview: This bulletin involves selectively...More

Honda Tech Tip: Dampers Lock Up After Lowering Vehicle on a Rack

You’ve got your service customer’s vehicle up on a rack to do some work. You lower it back down, but now it looks like a 4x4 ready for some serious off-roading or it feels like it’s got a rock-solid...More

GearWrench Expands 120XP Ratcheting Wrench Line

GearWrench has announced the availability of 11 new open stock combination ratcheting wrenches to its 120XP Universal Spline XL Ratcheting Wrench line. According to the company, 120XP Universal...More

Hunter's Social Media Contest Includes Trips to SEMA 2015

Hunter Engineering has launched a new, two-part social media contest that offers trips to SEMA 2015 and the chance to win a free SmartWeight Touch wheel balancer at the show. Before SEMA, two shops...More