Skip the auto shop - Our mechanics make house calls

Q: Truck has trouble starting, idle's too low, losing power, check engine light is on.

asked by on

I took my truck to the mechanic this morning who said that the spark plugs were wet so he did an engine compression test, which resulted in low 85 compression. He says the engine needs to be replaced. My question is, could anything else be causing these readings? What could cause my engine to fail this way? I drove the truck over an hour+ away on Tuesday and had a little trouble starting it 2 hours later, but it made the 1 hour drive home just fine. Are there any other options besides replacing the engine, that might fix the truck even temporarily?

My car has 107000 miles.
My car has a manual transmission.

A: You may want to try and run some combustion...

You may want to try and run some combustion cleaner into the intake. You can get the good cleaner from any Ford parts store. You use a small rubber hose and allow it to get sucked into the engine slowly and then let the engine sit for about 30 minutes then run a second can into the engine until it is gone and shut off engine and let sit 30 minutes. Start and rev the engine several times to loose any loose carbon and burn off any excess. This may increase the compression and help the valves seal better. It should help with the hard start also. If you need some assistance with this or the problem continues to persist, consider YourMechanic, as a certified technician can come diagnose your starting problem for an accurate 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: Check engine light coming on

Cold weather causes plastic and rubber components to contract. The intake manifold on my truck would expand and contract every winter, setting P0171 and P0174 lean codes. Then finally, this past winter, the manifold cracked. My guess is that you...

Q: The truck is going through about a small bottle of power steering fluid a month. When it is low, it makes a whining noise

Your power steering pump may be leaking and will whine when it is low on fluid. You should locate the leak in the system before you condemn the power steering pump. You may have a leaking steering gear or power...

Q: Can dirty filters cause the truck not to get enough power to pick up speed?

Hi and thanks for contacting YourMechanic. Dirty oil can cause problems with the engine, but not in two weeks unless you are driving long distances on the highways. Adding oil will actually aid the oil, so no worries until you...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.