Skip the auto shop - Our mechanics make house calls

Q: Engine chugging at low speeds when the weather is bad

asked by on

I have some problems with the truck. It has a high mileage of around 300,000. Recently, the engine started chugging. It occurs when the weather is bad. When I drive it at the rainy day, it runs a bit rough. It starts and idles well but after a while the engine starts chugging at low speeds around 25 mph. It lasts very shortly and the trucks runs fine after that. Is this serious? Does this happen because of the moisture?

A: It is very possible that moisture is gettin...

It is very possible that moisture is getting into the connectors of the engine control module. The connectors should be checked and cleaned if necessary. Di-electric grease can be used to help seal the connectors and keep the moisture out. Fault codes should also be read out of the engine control module to ensure that there are no other failures that could be affecting the drivability of the engine. You may want to enlist the help of a mechanic, such as one from YourMechanic, who has the expertise to prevent moisture ingress, and has the equipment to interrogate fault memories and determine the cause of your engine hesitation.

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: Check engine light came on & car drove roughly

You are absolutely correct. The MIL came on as a result of a fault in the engine computer. Because your vehicle is newer than 1996, then it has OBD-2 diagnostics which will allow any scan tool with OBD-2 capabilities to...

Q: My car is slow to start

Hi there. Typically what you are describing is an indication that a tune up service is due. As the vehicle's ignition and fuel system components age, they will collect excessive levels of carbon deposits, which makes it more difficult to...

Q: Car jerks and no acceleration. Slow pick up

Hey there. This may be related to a dirty or failing mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. When this fails, this...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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.