Skip the auto shop - Our mechanics make house calls

Q: Problem with valve injectors.

asked by on

One of my valve injectors is not working properly. My truck shakes too much. Six months ago I replaced the original injectors. The new ones worked fine until now. Now the shaking is back again.

A: There quite a few things that will need to ...

There quite a few things that will need to be checked. Fuel pressure and fuel pump volume need to be looked at along with a fuel sample. Incorrect fuel pressure or low fuel volume will effect the amount of fuel flowing through the injectors. Now your fuel delivery, or fuel injection timing, is set by the engine computer looking at several inputs including the airflow meter and the engine coolant temperature sensor. Injection timing is further corrected by what the oxygen sensor is reading, an aged or lazy oxygen sensor can adversely effect the air fuel mixture. You may want to enlist the help of a mechanic, like one from YourMechanic, who has the test equipment to diagnose your fuel system and carry out the necessary repairs.

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・Save up to 30%

Get a quote

What others are asking

Q: What could cause this vibration?

Hi there. If the vibration goes away when you release the gas pedal then chances are you either have a bad cv axle or an engine mount that is failing. Both of these will cause this to occur as they...

Q: Stalls when hit gas

This sounds like it could possibly be a fuel-related problem for your 1991 Nissan Pickup. I would want to know what the fuel pressure is by testing with a gauge. I also recommend doing a compression test to verify good...

Q: Grinding/Scrapping noise

This may be potentially related to the brake rotors which can accumulate a slight rust film on them even when sitting just overnight. When you begin to drive in the morning and they are cold, the scraping sound you may...

Related articles

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...
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.