Repeat Engine Failures – Not Properly Diagnosing The Original Problem

Automotive Engine Failure - Common Warning Signs - Major Causes
Automotive Engine Failure - Common Warning Signs - Major Causes

The installer’s worst nightmare, repeat engine failures from a lack of proper diagnosis.

You have changed an engine, cylinder head, or crankshaft only to have the replacement fail for the same problem; or another problem, only a short time later.

The Solution…Properly Diagnose The Original Problem. Not finding the original problem can cause repeat engine failures, costing a ton of money and inconvenience.

There are many situations that occur in today’s vehicles; that cannot be fixed by replacement alone. A failure of an engine, cylinder head, or crankshaft is only the result, not the cause of the problem. Because computers and sensors control today’s vehicles any one of them failing can actually cause repeat engine failures.

Blown Head Gasket Failure
Blown Head Gasket Failure

One example of a sensor/system failure is a blown head gasket or failed piston. So, The engine, piston, or cylinder head is replaced. Shortly after the customer returns with a blown head gasket, or part of the piston burned away. Because finding and correcting the original problem never did happen.

So, Before Replacing Any Of These Components, You Must First Find The Original Problem That Caused The Original Engine Failure.

The purpose of this post is to inform you, in the strongest possible way; of the consequences of not diagnosing and checking the systems that make an engine operate properly. As a result, not finding the original problems causing repeat engine failures.

Computers and sensors control today’s vehicles. There may be as many as 20 sensors feeding information to the vehicle “master control unit “ (MCU) or brain box.

Automotive Computers And Sensors
Automotive Computers And Sensors

There are other sensors, while not directly attached to the (MCU); that do affect the information the sensors feed to computers. These sensors are part of other systems that allow the vehicle to operate properly. All of these systems must be in proper operating order for the engine to function properly and have normal combustion. Consequently, abnormal combustion will result in detonation.

Examples Of Systems That Play An Important Role In The Proper Running Of Today’s Engines Are:

  • The exhaust system
  • Cooling system
  • Oiling system
  • Fuel ignition system
  • (EGR) system
  • Air temperature system
  • A.I.R. (thermactor) system, or RCV-CCV system
Repeat Engine Failures - Not Properly Diagnosing The Original Problem
Repeat Engine Failures – Not Properly Diagnosing The Original Problem

These systems are all controlled by the sensors that send signals to the (MCU). So, the result of this information is a properly or improperly operating engine. As a result, failure of any of the sensors which supply information to these systems; or failure of the system itself, can cause major engine failure.

Just as with the original engine, under proper care and maintenance; it is reasonable to expect mileage from remanufactured engines of 100,000 miles and up, if all conditions are the same. The difference then is in the changing over of an engine or part.


The sensors/systems that provide information to allow the engine to run properly also have 100,000 miles on them.

Therefore if you have not found the original problem keep looking. Otherwise you could end up with the installer’s nightmare….repeat engine failures.

Please Share DannysEnginePortal News