John's 4X4 Center
6367 Arapahoe Rd, Boulder, CO 80303 303.449.2640

General / Misc

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Trust the Service Center Procedures at John's 4X4 Center

It's comforting for Boulder drivers to know that John's 4X4 Center has exacting standards and procedures for taking care of your car. There are inspection procedures and auto service procedures.When B...
Published on: Feb 22, 2026

Simple Answers from John's 4X4 Center for Boulder: High Mileage Vehicles

Question What do I need to do for my high mileage vehicle? Answer This question gets asked a lot more these days.  The median age for vehicles on the road is now over 11 years.  Regardles...
Published on: Nov 02, 2025

John's 4X4 Center Tech Question on Your Drive Shaft

Question I’m Doug.  A few years ago, I was driving my ’85 powder blue Dodge Ram Charger with about 80,000 miles on it.  I was going up a hill and heard a noise like a tin can ro...
Published on: Aug 03, 2025

Alternator

Question My battery keeps going dead. I had it tested and it is fine - what could be the problem? Answer Well, your problem could be caused by several things.  Let's start with a likely suspec...
Published on: Jul 13, 2025

The 3 Vehicle Service Items You Shouldn't Put Off

When it comes to vehicle service, a lot of people procrastinate.  The reasons? Don't want to spend the money, don't have time to get it done, it's not urgent.  Sound familiar? Here are the t...
Published on: Jun 01, 2025

Your Vehicle's Other Power Plant (Alternator Replacement)

Your vehicle's engine is probably the first thing that comes to mind when you think of a power plant.  But it has another power source that is vital as well: the alternator. The alternator is wha...
Published on: Apr 27, 2025

The Test Your Vehicle Can Fail (Emissions Tests)

Clean air quality is something that helps all of us thrive here on Planet Earth.  And considering that motor vehicles are a contributor to air pollution, emissions tests in the U.S. and Canada ar...
Published on: Apr 06, 2025

Timing Chain

As your engine runs, the intake valves need to open up to allow air into the engine. They remain closed while the air and fuel is compressed and ignited, powering the piston. Then the exhaust valves o...
Published on: Mar 16, 2025