Skip the auto shop - Our mechanics make house calls

Q: I have a 2008 chevy silverado. I replaced the starter and fuel pump but my truck wont start. What else could it be?

asked by on

I replaced my fuel pump and starter but my truck still wont start. All fuses are in good condition. All the lights come on so i know its not the battery and i had the alternator tested and its good. What else could it possibly be?

My car has 100000 miles.
My car has an automatic transmission.

Hi There, This may be related to many different possibilities, some of which may be related to a lack of spark or possibly timing issues and some of which may be related to a fuel delivery problem or a combination of both. Things like ignition coils, crankshaft position sensor, spark plugs, spark plug wires or ignition module are all components that help to create spark and control ignition timing which may cause the motor to not produce spark or the correct timing needed to ignite the fuel in the motor.

In the case of a fuel delivery problem, this may be related to low fuel pressure, faulty or dirty fuel injectors, a faulty or dirty idle air control valve (this relays information about air intake to the computer which makes fuel adjustments), or potentially a faulty fuel pressure regulator or fuel pump. Fuel delivery problems will typically not allow the proper amount of fuel to be delivered to the cylinders which results in a lean fuel condition which can cause backfiring or simply cause the motor not to start as a result of fuel starvation. In some cases too much fuel may be supplied to the motor causing too much fuel to be introduced to the motor faster than what it can burn it. This results in the motor being flooded with too much fuel also causing it not to run properly. Any of the above possibilities can create an imbalance in the proper air/fuel ratio as well which will cause the motor to run very rough or not at all. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

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
  • Home
  • Questions
  • I have a 2008 chevy silverado. I replaced the starter and fuel pump but my truck wont start. What else could it be?

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: How do I open the trunk with the remote keyless entry (RKE) transmitter?

The remote keyless entry (RKE) transmitter can be used to open your vehicle’s trunk. Here’s how: 1. Press the unlock button on the RKE transmitter. The unlock button looks like an open padlock, and will unlock all of the vehicle’s...

Q: Key would not release from ignition for multiple attempts

Hey there, thanks for writing in about your 2008 Saab 9-7x. You should be able to take the vehicle to an independent shop, but any parts the vehicle will need will likely have to be ordered. Most independent shops don't...

Q: Car won't crank up as well as some other electrical issues

This sounds like a BCM (body control module) malfunction. This could have been caused either by a low voltage issue or a voltage spike. If the electrical system is dead, there is a power fuse that comes from the battery...

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...
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.