Q: I have a 1994 Ford F150 XL 4x4 with a EFI 5.0 liter v8 it has a hard time starting when then engine is warm

asked by on

It does not like to start very well when it is warm outside and or the engine is warm after letting it sit for and hour that is when it has the trouble starting. it also starts shaking every once and a while when it comes to a stop light. it has had a new fuel pump put in but i dont think that is the problem because it starts perfectly when it is cold outside and the engine is cold. lately the engine has started to not want to hold a idle very well. all of the problems that i have said have slowly gotten worse over the passed 3 year and i honestly need someone who can help me out and tell me as to what it might be or what it is.

My car has 303116 miles.
My car has an automatic transmission.

Hello. You are most likely having problems with the fuel injectors clogged and there is carbon built up on the valves. Try using an injector and combustion cleaner to clean injectors and reduce carbon buildup on the valves. Have the truck checked and work done by a mechanic if you need help. The ignition should be replaced as needed like plugs, wires, cap and rotor. Injectors need to be professionally cleaned using a professional cleaner and not just some fluid put in the fuel tank.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. I have a 1994 Ford F150 XL 4x4 with a EFI 5.0 liter v8 it has a hard time starting when then engine is warm

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 hesitation from stop to acceleration

Hi, thanks for writing in. Prior to further diagnostics you should install the spark plugs that are referred to in the factory service manual and/or obtain the plugs from a GM dealer. Installing alternative aftermarket plugs with different gaps, materials,...

Q: Difficult to control in wind and veers above 60 mph

Hello there. This sounds like a more unusual situation. Ford uses the rollover stability control system as an additional safety feature to help prevent rollovers. A bit of body movement in normal wind speeds would not be abnormal. It should...

Q: Cylinder lock turns, but nothing happens

The ignition key cylinder turns a mechanism in the steering column normally. If this mechanism breaks, then the ignition key cylinder will not turn the ignition switch. The steering column covers will need to be removed to find the broken...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.