Thread: Vibration/shaking

My 03 5.4 has a rough,shaking idle. If it sits for a while like overnight, it starts up smooth. If I run it for a while, cut it off then turn it right back on, it feels rough and shakes slightly. Can feel it in the seats. Rpms stay still and don't fluctuate up and down.

Any engine lite come on ? Work on it recently?

2007 F150 XLT FX2 SPORT - 5.4l 3V 3.73 LIMITED SLIP EDGE/EVOLUTION PROGRAMMER

Engine light came on a few months back. Bank 1 and bank 2 lean. 90$ 02 sensor didn't fix it. It was a rubber elbow on a hose that had a burned hole in it. Replaced it and the light never came back on but still has that weird vibration in the interior!

Originally Posted by slim

Engine light came on a few months back. Bank 1 and bank 2 lean. 90$ 02 sensor didn't fix it. It was a rubber elbow on a hose that had a burned hole in it. Replaced it and the light never came back on but still has that weird vibration in the interior!

Running lean? Is that what scanned? Coil pack sir! Worst thing about our beloved 5.4's. Coil packs suck ass. Mine go all the time. And I just rebuilt the hell out of my motor. Actually. That coda came up yesterday. To lean. Cyl 1. Put a brand new coil pack in and runs great. I'm tellin ya pal. That's it

It must, bc they printed out the causes of what it could be and 02sensors were on there. Plus the shop said it needs 02 sensors but evidently it didn't.

Originally Posted by slim

It must, bc they printed out the causes of what it could be and 02sensors were on there. Plus the shop said it needs 02 sensors but evidently it didn't.

Word of advice, for future reference never believe everything they tell you at a shop. They run a business and the goal of a business is to make money, they'll try and sell you anything they can if they think you know nothing of vehicles and are gullible enough. O2 sensors will not cause your engine to run rough, all they do is measure the oxygen in the exhaust gas to determine if the engine is running efficiently. This info is used by your ECU to adjust the a/f ratio to even it out. If the sensors go bad or if the readings are past acceptable variation levels then yes it will throw a CEL and code. But the O2 sensors wouldn't cause the rough idle.

Here's a list of possible causes if they haven't been checked or changed recently:
Fuel filter
Air filter
Fuel injectors could be clogged
Throttle body needs cleaned
Spark plugs and COP's

These are the most common causes of a rough idle, check them and clean/change what is necessary. For fuel injectors don't pay the shop to do it either, they'll bend you over the table with their prices, just go to an auto shop and pick up some fuel injector cleaner of which I recommend Lucas. Good luck and let us know what you find!

Originally Posted by RhinoZ24

Word of advice, for future reference never believe everything they tell you at a shop. They run a business and the goal of a business is to make money, they'll try and sell you anything they can if they think you know nothing of vehicles and are gullible enough. O2 sensors will not cause your engine to run rough, all they do is measure the oxygen in the exhaust gas to determine if the engine is running efficiently. This info is used by your ECU to adjust the a/f ratio to even it out. If the sensors go bad or if the readings are past acceptable variation levels then yes it will throw a CEL and code. But the O2 sensors wouldn't cause the rough idle. Here's a list of possible causes if they haven't been checked or changed recently: Fuel filter Air filter Fuel injectors could be clogged Throttle body needs cleaned Spark plugs and COP's These are the most common causes of a rough idle, check them and clean/change what is necessary. For fuel injectors don't pay the shop to do it either, they'll bend you over the table with their prices, just go to an auto shop and pick up some fuel injector cleaner of which I recommend Lucas. Good luck and let us know what you find!

Very nice write kid

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Man I'll tell ya. The kid nailed it. Check all that. Clean all of that. When was the last time it's had plugs?