Skip the auto shop - Our mechanics make house calls

Q: When rev engine, short lag and slows to idle

asked by on

Except for the current engine problem, I’ve really had good performance from my truck. When I rev up the engine, even slightly, there’s a short lag as the engine slows back down to an idle. It is briefly almost a muted sound and then it continues to idle. For some extra info: this truck had an upgrade of a 3” (approx) lift kit and also a magnaflow exhaust kit. The engine ‘mute’ has been occurring since before the magnaflow exhaust kit was done. What should I do to fix this problem?

A: You did not mention the engine you have in ...

You did not mention the engine you have in your truck, but I would suspect the engine turbo vane control is sticking when you rev the engine and will cause the engine to stay revved until the vanes go back to normal. If the turbo vanes are moving freely, then you may have a sticking idle valve and testing of the computer controls will indicate which system is causing the issue when tested. A qualified mechanic, such as one from YourMechanic will be able to diagnose your rough engine issues and let you know exactly what needs repair.

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

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: Car won't start

If you are smelling fuel, then you may have a leak and should not try to start the vehicle until the source of the fuel leak is found. Your vehicle may have a leaking fuel line or injection system. Sometimes...

Q: On interstate, engine died, idled, no power

Hello there, The TPS can be a serious issue if the car dies like it did. I would not recommend driving the vehicle until repairs have been performed. There is no recall for this fault though there is a technical...

Q: Fan sound when stepping on gas pedal

Hello. If the noise occurs when you accelerate then it sounds like it may be a timing chain problem. Being that this engine does not have a fan the noise typically comes from the timing chain. It may be from...

Related articles

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.