Skip the auto shop - Our mechanics make house calls

Q: Truck loses power and tries to stall

asked by on

I have a 2005 Nissan Titan. About a year ago I was having an issue with the truck losing power, trying to stall and running rough. The truck would run fine for about an hour or two and then would suddenly lose power, would not accelerate, back firing. If I pulled over and let it rest for a few minutes, it would regain power and I could go a short distance till it did it again. If I let the truck rest longer, it would go further before repeating the issue. The CAT light finally came on so I replaced the entire exhaust system. After that, the truck seem to run better but would still act up if I punched the accelerator to pass another vehicle. Now the issues is starting up again and it is getting worst. I was thinking of gutting the CATS but don't know?

My car has 231000 miles.
My car has an automatic transmission.

A: Hey there. This is a common sign of a fault...

Hey there. This is a common sign of a faulty ignition coil. Ignition coils are coated with a varnish-like insulation that becomes brittle over time after being stretched then contracted repeated as the copper beneath them expands and contracts at a higher coefficient than the insulation.

The insulation develops micro fractures that open when heated and close when cooled. When open, they allow shorting of coil windings and decrease or eliminate the coil’s ability to function. This type of temperature cycling happens because every time you shut the engine off, the fan stops running, the coolant stops flowing and the temperature under the hood rises. Every time you start the engine again the coolant flows, the fans turn on, and the temperature drops. The areas in and around the tops of the combustion chambers, the exhaust manifolds, and the exhaust components are hundreds of degrees hotter than the outside temperature under the hood. When this heat dissipates and is absorbed under the hood, it is trapped causing this cycling effect.

Components that contain heat sensitive materials include parts like coils, injectors, igniters, and some sensors. Any of these may be potentially subject to this same kind of heat problem which can be very difficult to trace. I would recommend having an expert from YourMechanic come to your location to take a look at your truck to properly diagnose the loss of power.

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: Air sucking noise at low RPM during acceleration

Inspect the inlet air tube between the throttle body and the mass airflow sensor. You most likely will find that the tube may be loose, has disconnected, or has cracks in the hose itself. If it is damaged then replace...

Q: i get a check engine code p0351

Generally, this code points to a malfunction in the primary or secondary ignition coil circuit. Your vehicle has one ignition coil that sends spark to a distributor which then sends the ignition spark to the cylinders in a specific order....

Q: Navigation control panel screen is black, no power, no light, all other lights on dash are working.

Unfortunately, when the navigation screen in a vehicle goes blank, this usually indicates that the screen has failed. I would be great if there were a fuse for the screen alone but unfortunately, there is only one fuse for the...

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control 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...