Condition |
Typical Problem |
| EGT rises more than 100 degrees |
Preigntion - |
| EGT increase in one cylinder by 50-100 degrees F |
Fouled spark plug or faulty ingition
Intake manifold leak |
| EGT increase in all cylinders |
Mangeto failure or incorrect (overly retarded) igntion
timing. |
| EGT decrease in all cylinders |
Air filter restriction
Carburetor ice
Overly advance ignition timing |
| EGT decrease in one cylinder |
Intake valve
low compression |
| Loss of EGT in one cylinder during Mag Check |
Fouled spark plug or faulty igntion |
| Hard to find peak EGT |
Detonation due to low fuel octane
Low energy ignition or wrong spark plugs or gap |
