Q: High RPM's after tune up.

asked by on

So I did a full tube up on my mother in laws truck. It's a 2003 Dodge Ram 1500 4.7 engine. I changed the air filter, pcv valve, all 8 spark plugs and coils. When doing the tune up I removed the air filter housing as well as the air resonator box. She hasn't taken great care of the truck routine oil changes is about it that she can remember. She had it parked at her place in Texas, and something made a nest on top of her engine had to try and blow it all off before/during the tune up. Didn't run into any issues during the tune up. When she took it home today, /she said it reved really high when she started it, at idle RPMs were over 1000 then it felt like it want to go even when she was stopping. Maybe the PCV line got nicked loose? Or I may have knocked off a vacuum line? What are your thoughts?

My car has 210000 miles.
My car has an automatic transmission.

Hi there. Sounds like the rodent that nested on the engine may have knocked off a vacuum hose or chewed through a vacuum hose. The engine idle could be high for a vacuum leak or the idle air control valve (IAC) not working. If the engine vacuum lines are good and not broken or loose, then check the IAC and see if it’s unplugged or the wires are chewed through. Replace the IAC if its not working and the wires are good. If you need further assistance with the rpm’s being high, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. High RPM's after tune up.

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: A problem with the crank sensor wire

If you suspect that there may be an issue with the crank sensor, I would recommend having your vehicle inspected by a qualified professional. Consider YourMechanic as this can be done at your home or office.

Q: Radiator fluid poured out on driveway

Hello. If the coolant is coming from that area, then it may be a few things. Most commonly, it is from the heater core. If the heater core leaks, the coolant will come out of the evaporator drain hole allowing...

Q: My 2005 Acura TL is not accelerating but rpm is going up and down erratically. What is causing this?

Hey there. If the vehicle has a manual transmission, your issue can be caused by a worn clutch. When the clutch is worn, it no longer has the clamping strength to transmit power from the engine to the transmission. This...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...