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.

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

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!
  • Home
  • Questions
  • Truck has trouble starting, idle's too low, losing power, check engine light is on.

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: I have a 1991 Legend. Check engine light is on. Tried pulling codes with paper clip in service connector. Light still solid,won't

Hi there, thanks for writing in about your 1991 Acura Legend. I would start by verifying that you are connecting the correct terminals and that you have continuity (i.e., the clip is actually contacting the terminals well). If so, and...

Q: My back left light is very dim and the turn signal doesn't work

The wire connection at the turn signal multifunction switch should be checked for heat related damage and replaced with a new multifunction turn signal switch. The switch goes bad but also the connector can be damaged also at the same...

Q: Car lost power due to computer glitch

I don't have the exact repair information for your vehicle since it is so new. My guess is, however, the powertrain control module (PCM) is sensing low oil pressure when it shouldn't be. This could be because of a problem...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.