Q: Loses power after engine get up to temp, runs good cold

asked by on

Truck runs great cold when it gets up to temp the power decreases greatly. new fuel pump, new fuel filter, new air filter has been hooked up to two different computers and it's showing no codes at all. New muffler and dual pipes,the old ones were bad. im at a loss and so are my mechanics

My car has 84000 miles.
My car has an automatic transmission.

Heat causes electrical resistance in a circuit or component to increase. If you have a bad component that may have a bad internal connection, the increase in temperature could cause a voltage drop in the component. Also, heat can cause a crank position sensor to act up if it is starting to fail.

Temperature sensor failure can sometimes cause similar symptoms. The dashboard temp gauge typically uses a different sensor than the ECU uses to determine if the vehicle is cold or warm, affecting the amount of fuel that is required for proper operation. Ignition coils and also other components are vulnerable to higher than normal resistance from heat.

It may be tricky to try and diagnose this yourself, but a fun challenge for a seasoned, certified technician to figure out. In depth electrical testing of individual components will be needed to determine the exact cause of your vehicle’s loss of power.

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. Loses power after engine get up to temp, runs good cold

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: Gas not going through new filter

If you have recently installed a new fuel filter, ensure that the filter was installed correctly. Fuel filters are only designed for the fuel to flow in one direction. If the fuel filter was installed backwards, this will prevent the...

Q: Car won't start, and rear windshield wipers don't work

Most likely, these are two separate issues. A vehicle that doesn't crank or start indicates a problem in the starting/charging system. It may be that the battery connections didn't get tightened down properly at the time of replacement. The...

Q: Power locks orthopedic seats

Both of these systems are controlled by fuse 'A' in the electrical center of your 1990 Mercedes-Benz 300E. If this fuse is blown it would prevent both the locking and orthopedic seats from functioning. I doubt it was related to...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.