Bountiful Diesel Repair Specialists
Your Best Dealer Alternative for Diesel Service in Utah
We are the leading Ford Powerstroke, Dodge Cummins and Duramax repair and service center in Bountiful, UT. From simple oil changes to the most complex diesel engine, fuel systems and transmission repair and replacements Affinity Auto is qualified.
Here at Affinity Auto we Specialize in Diesel Pickup Auto Repair and Service click on the Model links below to find common repairs done on that model.
- 6.0l Powerstroke
- 7.3L powerstroke
- 6.4L Powerstoke
- 5.9L Cummins
- 6.7L Cummins
- Duramax 6600
All work is warranted.
Diesel Repair Shop in Bountiful
Affinity Auto Diesel Repair Shop in Bountiful is Utah’s leader in medium and light duty diesel engine, transmission and drive-line service and repair. Our expert diagnostics allow us to pinpoint problems for a timely and efficient service, saving you time and money. Our diesel mechanics are competent in servicing Ford Powerstroke, Chevy Duramax, GMC Duramax and Dodge Cummins.
To get a diesel service or repair quote, call us at 801-292-1331
Benefits of Owning a Diesel Engine
Number one is unmatched TOWING power, built with durability, reliability, and optimization in mind, diesel engine systems are designed to use their own compression to ignite fuel. In gasoline engines, the fuel is mixed with air, compressed by pistons, and ignited by a spark plug. The rate of compression in a diesel engine is more than three times that of a regular gasoline engine system. In a diesel engine system, the air is compressed at a high compression ratio, which introduces a great amount of heat. Following this compression, fuel is directly injected into the cylinder, where the fuel vapor is ignited. Diesel engines are built without spark plugs. Instead, diesel systems use glow plugs to start and run more efficiently in colder temperatures. Glow plugs have two heating elements that allow them to get very hot very quickly for fast starts. Turbochargers increase the compression ignition by quickly compressing the air flowing into the engine, allowing for more air to flow into the chamber. More air in the combustion chamber means more fuel can be added to the combustion process. Turbochargers provide diesel engine systems like Powerstroke, Duramax or Cummins with improved efficiency, and ultimately, more miles per gallon of diesel fuel.
Diesel Repair at Affinity Auto
Your diesel engine plays a major role in your vehicle, so it is especially important that you be aware of problems and seek repairs immediately. Because diesel engines make a considerable amount of noise during normal, everyday operation, diagnosing diesel engine problems can be hard to do if you are listening in on the engine. However, there are a number of symptoms you can watch out for that indicate your diesel engine needs maintenance. A diesel engine running at lower RPMs or a hard-to-start engine are signs of low fuel pressure, but these symptoms may also be signs of insufficient fuel supply or poor fuel quality. Allowing our knowledgeable diesel mechanics to troubleshoot your diesel engine can help ensure that the proper repair procedures are followed to repair the engine. Every diesel engine manufacturer requires different preventive maintenance procedures, so referring to your owner’s manual will help in planning and scheduling routine maintenance services. Keeping all diesel engine components—glow plugs, fuel injectors, and turbochargers—in proper working order will increase the life of your diesel engine system while promoting overall vehicle maintenance. Our diesel mechanics are experienced in repairing Ford Powerstroke, Chevy Duramax, GMC Duramax and Dodge Cummins.
Hard Starting & Drivability Diagnostic
Diesel engines contain many components and small systems. Problems with systems and components can lead to hard starting and the need for a drivability diagnostic. When your diesel engine is hard to start, there are several things worth checking. First is the temperature. Diesel engines rely upon heat for the combustion process to occur. If the engine uses glow plugs, they may need to warm up before they can properly start the engine. Second is oil. The internal components of a diesel engine require a lubricant to perform at their best. Engine oil can prevent harmful friction from occurring and can remove dirt and other damaging debris. If a vehicle has a turbocharger, a dirty or low amount of lubrication may also harm the turbocharger and lead to drivability and hard starting issues. A bad battery, fuel supply, and fuel injectors may also lead to hard starting issues.
Why Should You Have Hard Starting and Drivability Diagnostic Services Performed at Affinity Auto?
If your diesel engine is difficult to start, bring your vehicle in and we’ll be happy to perform a hard starting and drivability diagnostic. If you don’t know what’s making your engine hard to start, we can carefully look over its many parts and systems and help you identify the cause. If you suspect or know the cause, we can verify it for you and help you with your next steps. From faulty glow plugs and dirty oil to broken fuel injectors and a low supply of fuel, our staff is happy to work with you to fix your vehicle’s problems. Is your turbocharger experiencing corrosion? Has your battery gone dead? Allow our diesel mechanics to examine the problem, identify what measures need to be taken in order to correct the issue, and prevent it from happening again.
Our diesel mechanics are competent in servicing Ford Powerstroke, Chevy Duramax, GMC Duramax and Dodge Cummins.
THE MOST COMMON PROBLEMS of the POWERSTROKE 6.0 ARE:
- FICM = (fuel injection control module) The FICM is a computer that runs the fuel injectors, it supplies 48 volts to the injectors and when this starts to fail the 6.0L will have a hard start or no start issue, rough idle and loss of power. When replacing the FICM you must use the Ford IDS scan tool to remove the programing from the bad FICM and reprogram the new FICM and the PCM.
- FUEL INJECTORS = Deliver fuel to the cylinders, when they start to fail (usually in pairs) it can be caused by several other issues like the FICM, dirty oil (not being changed every 5K miles) low fuel pressure, mechanical failure or electrical issue. Most injector issues are noticeable at the beginning of a cold start up and will go away once the engine is warm. Signs of a bad injector are hard start, rough idle, black or grey smoke. If ignored this can cause serious engine damage. Do not ignore this issue because it goes away once the engine is warm!
- HIGH PRESSURE OIL SYSTEM = The 6.0L fuel injection system operates on oil pressure, very high oil pressure. Problems with the HPOS are oil leaks (internal in the engine) due to failed/deteriorated O-rings that are caused from excessive oil temperature (bad oil cooler) and high pressure. Ford has improved the design of the O-rings and has an updated fitting that replaces the STC. (snap to connect) The STC fitting was used in the 05-07 6.0L and has a 100% failure rate. If you still have the STC fitting on your 05-07 it is just a matter of time before it fails. Symptoms are hard start / no start, loss of power and occur mostly when engine is hot. The HPOS on the 03 to early 04 6.0L are a different design and most of the issues are caused by a bad ICP sensor (injection control pressure) located under the turbo and fails due to heat, or a failed HPOP (high pressure oil pump) and or a failed IPR (injection pressure regulator) The IPR will fail due to debris going through it caused by (not using a ford OE oil filter)
- EGR COOLER = The EGR cooler cools the exhaust gas that is recirculated back into intake manifold so that it can be re-burned for cleaner emissions. When it fails it will cause coolant to enter in to the intake manifold and be burned in the combustion chamber causing a loss of coolant and white smoke from the tail pipe. Depending on the severity of the failure the engine can hydro-lock and cause severe engine damage = bent connecting rods. The EGR COOLER only fails because of a clogged or restricted OIL COOLER.
- OIL COOLER = The Oil cooler is the cause of most the 6.0L’s problems. The Oil cooler cools the engine oil by heat transfer from / through the engine coolant, kind of like a small radiator. There are no warning signs for a clogged or restricted oil cooler but tests can be done to determine if a problem is there waiting to happen. The reason the Oil cooler gets restricted and clogs up is due to silicone sand in the coolant system. The sand is left over from the casting process of the engine block and because it was not thoroughly cleaned from the coolant passages before the engine was assembled and it gathers at the most restrictive point which is the Oil cooler. When the Oil cooler is not restricted the coolant temperature and oil temperatures should be within a couple degrees of each other, anything above a 15 degree difference indicates a problem. If the Oil temperature gets too hot it can cause gaskets and O-rings (in the HPOS )to fail and the lack of coolant flow to the EGR cooler will cause it to fail and can and will cause head gaskets to fail as well.
- EGR VALVE = The EGR valve is an electric valve that controls the flow of exhaust gas into the intake manifold. The EGR valve fails due to carbon build up on the valve or it can fail electronically. When it is bad it can cause black smoke, loss of power, no start and a fluttering noise.
- TURBO CHARGER = When a Turbo starts to fail it will have the same symptoms as a bad EGR valve. The vanes in the turbo that control boost can build up with carbon or rust which can cause an over boost condition or a no boost condition. Sometimes the Turbo can be taken apart and cleaned. Another type of failure can be bearing failure which can send pieces of shrapnel into the cylinders causing engine damage.
Cummins engines are thought to be completely indestructible. In practice, however, there are two fatal flaws that not only damage these engines but can ruin them beyond repair.
Fatal Flaw 1: The Killer Dowel Pin The first such weakness affects 5.9L Cummins engines manufactured between 1988 and 1998 (in other words, 12-valve Cummins engines used in Dodge Rams). These engines feature a steel dowel pin that locates the front timing gearcase. Over time, this steel dowel pin can wobble out due to the constant heat cycles and vibrations of the engine. If (or when) the dowel pin works its way completely out, it falls into the timing gearcase.
When the dowel pin falls, a few things can happen. If you’re lucky, the pin will miss everything and just fall straight into the oil pan. If you’re not so lucky, it will hit one of the timing gears and shoot out the side of the timing case, creating a BP-sized oil spill in your driveway. In the third and most unfortunate scenario, the steel pin will jam between the timing gears. This typically causes the cam to break, the valves to hit the pistons, and the engine to internally self-destruct. While this last scenario is rare (a hole in the timing gearcase and a big puddle of oil is most likely), it has happened to many unfortunate enthusiasts, which is how it got its name-the killer dowel pin (KDP).
Fatal Flaw 2: The Weak 53 Block The second potentially deadly flaw occurs in ’99 to ’02 5.9L Cummins 24-valve engines. It’s known as the 53 block problem, because these engine blocks have the number 53 cast into the side of the crankcase. After years of use, the 53 blocks tend to crack until coolant starts to pour out the side of the block. This is an issue that many people kid themselves about. While it’s something you can live with for a while, eventually the leak will get so severe that you’ll be refilling your cooling system on your commute to work. Sooner or later, the truck will need a new engine if it’s not repaired.
Tackling the Killer Dowel Pin For a KDP repair, most of the front of the engine needs to be disassembled to gain access to the timing gear case. The fan, shroud, overflow bottles, balancer, and lower pulley all need to be removed. With the front of the engine stripped, you can install a small metal tab over the dowel pin to keep it from rattling out. While you’re in there, make sure to tighten up all the gear case bolts. These bolts loosen over time and will do just as much damage (or more) if they fall into the front gear train. Many diesel companies (such as TST Products and Source Automotive) sell killer dowel pin kits for about $60 and include a tab, timing cover gasket, and front crank seal to put the engine back together. After performing this repair (or getting a shop to do it for you) you’ll feel much better knowing you’re not driving a ticking time bomb down the highway.
With more than 10 years of engine operation, the Duramax is a proven player in the mid-size diesel world. The engine design has always been on the same platform with only improvements to the integrity of the design as power increased and fuel injection changes as emissions reductions became greater.
There have been some unusual failures such as broken rods or pistons, but very few accounts.
The biggest problem was the injector flaws from the LB7.
Other than this, there are occasional mechanical failures that can often be associated with any engine design. Parts over time become tired, it’s just related to what the vehicle is used for and how much maintenance is performed.