Vehicle Won't Start or Engine Noises

Read articles related to common problems why your car or truck wont start. This section also explains some common engine noises and there possible causes.

Battery Diagnosis
If the battery tests good but still fails to perform well, the following are some of the more common causes:

A vehicle accessory was left on overnight.
The driving speeds have been slow with frequent stops.
The electrical load has exceeded the generator output (particularly with the addition of aftermarket equipment).

If when you turn the key the engine turns over normally but will not start, there can be any number of reasons for this problem. Some basic checks will need to be done to diagnose this problem.

1. Do you have fuel pressure.

There are many thing that can cause the engine to not crank over when turning the ignition key.

A Dead Battery

Batteries can fail at any time. Sometimes there is no warning, others times you may notice that the car is turning over slower and slower over the course of a few days or weeks. This may be because the battery is getting weaker and weaker, or you may have a charging system problem.

Main Bearing Noise

Damaged or worn main bearing noise is revealed by dull thuds or knocks which happen on every engine revolution. This noise is loudest when the engine is under heavy load. Excessive crankshaft end play is indicated by an intermittent rap or knock sharper than a worn main bearing.

The following are causes of main bearing noise:

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How Things Work

Air Bag (SIR) System Function and Operation

The Supplemental Inflatable Restraint (SIR) system supplements the protection offered by the driver and front passenger seat belts. The SIR system deploys an air bag from the center of the steering wheel and from the right side of the instrument panel. The knee bolsters and the steering column absorb crash energy. The driver and passenger knee bolsters are below the instrument panel.

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Common Engine Codes

P0128 Coolant Temp Below Themostat Threshold

An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the powertrain control module (PCM) for engine control and as an enabling criteria for some diagnostics.

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