91 f150 bad timing chain symptoms manual#
91 f150 bad timing chain symptoms code#

91 f150 bad timing chain symptoms manual#

Throttle surge is an extremely tricky issue, especially in an automatic where there’s no manual clutch to separate the engine from the wheels. The throttle surge and valve braking through contact with the pistons are issues related to the camshaft, but possibly cam phasers too. In some cases, the car will even enter the “limp” mode, which drastically cuts the power output to prevent damage to the engine. With a bad cam phaser, the response from the engine may be slower, and the car will feel lazy and sluggish. The difference in performance can be felt when you step on the gas. Reduced performance is obviously included in the loss of power symptom, but sometimes it’s not that obvious that the engine is not running at 100%. The symptom will increase in magnitude as the cam phaser deteriorates, ultimately causing knocking noise and frequent stalling of the engine. With a bad cam phaser, the engine won’t run in the most optimal way, which may lead to more noise and vibrations, especially when idling.

91 f150 bad timing chain symptoms code#

The easiest-to-spot symptom of a bad cam phaser is the check engine light coming on.ĭepending on how your vehicle registers the issue and how it occurs, you will either get a proper error code relating to the cam phasers, a generic engine fault code, or a code that’s related to the symptoms, such as rough running. Generally, these two symptoms go together, as increased fuel consumption on its own can be caused by a number of problems. On top of reduced performance, your vehicle will also start to consume more fuel. The issue is not only annoying but can be dangerous as it may lead you to overestimate the current power of your vehicle. The lack of power is obvious when you try to overtake or get ahead after a highway toll booth. Even if you don’t push your vehicle hard, you’ll notice a significant difference in how the vehicle behaves. The most noticeable symptom of cam phaser going bad is the reduced engine power. To confirm, use an OBD2 scanner to check the error codes. If you experience a combination of any of the following symptoms, it’s highly likely that your cam phaser has gone bad. The cam phaser can adjust the camshaft so the car responds better at low RPM, or run more efficiently when you step on the gas.

The two work together to get the ideal valve operation at all times. What Are Cam PhasersĪ Cam phaser is a sprocket that is operated by the vehicle’s computer, positioned on the cam drive sprocket, the part responsible for controlling the camshaft.Īs the camshaft is responsible for timing the opening and closing of valves in regards to the position of the crankshaft and pistons, it is important that the cam phasers are operating properly. The engine will consume more fuel and will run worse and rougher than usual. When cam phasers go bad, you’ll experience: rough running and hard starts, a lack of power with sudden and uncontrollable power surges. It operates the camshaft by adjusting its position relative to the position of the pistons and the crankshaft. Cam phaser is one of the vital pieces of the engine’s machinery.