Skip the auto shop - Our mechanics make house calls

Q: truck

asked by on

hey so i have 06 f15 my alternator just got replaces and my alternator belt. but as soon as that was done my check engine light went on and now every time i drive my rpms go up to like 5 or 6 and my rear tires start to tick at like 70 mph. Please help me

My car has 140000 miles.
My car has an automatic transmission.

A: Hello. From what you are explaining it soun...

Hello. From what you are explaining it sounds like your issue with the engine rpm is with the idle control valve. Is this engine speed issue only occurs at low speeds then this may have failed, which is common after a voltage issue with the truck. If it occurs at all speeds then you may have a vacuum leak or something else may be disconnected from the alternator replacement. As for the tires feeling like they are jumping that sounds like a tire balance issue. It can be caused by the same problem if there is an air leak in the engine as that can cause the air flow sensor to read improperly which can affect transmission shifting. I would usually start by test driving the vehicle to see when these issues occur. If you are planning on having this engine and tire issue checked, consider YourMechanic, as a certified mechanic can come to you to [diagnose what is causing this fluctuation in engine rpm] https://www.yourmechanic.com/services/car-idle-is-rough-inspection

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Hard shifting transmission light comes on

Transmission issues like this can range from low transmission fluid to mechanical issues to electrical issues. Since the light has come on, the first step to take is to scan the vehicle for diagnostic troubleshooting codes. If a sensor, shift...

Q: My AWD is not working

Hey there. This could be anything from something simple as a differential clutch connector problem to something more serious, such as a mechanic failure with clutches, rear axle, or coupling. You should have a Check Engine Light of some kind...

Q: Car has been misfiring 2007 Mercury Mountaineer

Hello - first task is to check for problem codes, whether the Check Engine is lit or not. If it is, there should be an indication of which cylinder is misfiring. Misfiring can be ignition related - plugs, coils, timing...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...