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?

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: Revving and humming noise while driving - 2006 Scion xA

It sounds like your cooling fan kicking on and off. It's even louder and more pronounced when the AC is on. The strain on the engine also will cause the RPMs to jump up a little bit during these cycles....

Q: My car will shake/vibrate violently when trying to start or turn off the engine after filling up the gas tank

Hello. This occurs from the purge valve not working properly. It can also be a vent valve issue, but that is not as common. These are part of the EVAP emissions system. If the purge valve is not closed when...

Q: Two injectors clogged

Hi. I know the injectors are expensive, but there is a lot of labor involved in their replacement. At the very least, they should be replaced one bank at a time, or all at once. A faulty injector will not...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...