Ticking Noise Or Misfire On 2005-2014 GM 5.3L V8 Engines With AFM

Problems regarding Chevy 5.3L engines Problems regarding Chevy 5.3L engines, AERA technical committee offers the following information. Regarding a ticking noise or misfire on 2005-2014 GM V8 engines. Therefore with AFM (Active Fuel Management, formerly known as displacement on demand (DoD)). Engine ticking or misfires seem to be happening on cylinders 1, 4, 6 and or 7 on the effected engines. Causing this ticking or misfire condition may be the result of an AFM lifter. This unlocks as soon as the engine is started or one that is mechanically collapsed /stuck all of the time. If an AFM lifter unlocks as soon as the engine is started, low compression will be found on that cylinder during an AFM compression test. Along with the SES light, DTC PO300 and engine misfires on the related cylinders, but it is unlikely that any noise will be experienced. If an AFM lifter is mechanically collapsed/stuck, low compression will be found on that cylinder during an AFM compression test. Along with a consistent valve train tick noise, SES light, DTC PO300 and engine misfires on the related cylinders. These lifter concerns may be the result of internal locking pin damage, which may occur if the response time of an AFM lifter unlocking event … Continue reading Ticking Noise Or Misfire On 2005-2014 GM 5.3L V8 Engines With AFM