Skip the auto shop - Our mechanics make house calls

Q: Tbi problems

asked by on

My son recently hooked the battery up backwards. Luckily, i yanked it out of the vehicle before the fire would've started. Now... the tbi isn't receiving any fuel. New pump, sending unit, relay, lines, and ecm. Have spark, pressure at the throttle body, and fuses are good. Injectors refuse to spray. Why? I NEED this truck to work. NOW.
My car has a manual transmission.

A: The fuel injector is a simple part. You can...

The fuel injector is a simple part. You can test the injector by giving it power and ground. If there is fuel pressure, it will spray for as long as you hold the power on. You can also check the electrical resistance. It should be around 1.5 ohms.

The injector receives power through the ECM fuse. It should have power with the key in the run and start position. The ground comes from the ECM. You will need a noid light to test the ground pulse from the ECM.

There are several fusible links to check too. The smaller wires connected to the starter battery pole are powered at the starter. That's where the fusible links are. Pull on them to test. If they are flexible, they are blown.

How did you check your fuses? They should have been checked with a test light to verify they are powered.

If you need more help, consider YourMechanic, as a certified technician can help you with your fuel injectors and pinpoint any other problems your car is having. We come to you.

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 needs to be done to a vehicle with fuel injectors that hasn't been started in three years?

Hello. If the vehicle has been sitting for three years with the same fuel in it and hasn't been started, then you may have some fuel system problems. Over time, the fuel changes and will start to solidify and turn...

Q: Idles rough and strong rotten odor coming from exhaust.

This may be a sign of a clogged catalytic converter. As you may already know, the catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is clogged, this...

Q: Won't shift when moving forward

The seller probably had the right idea. 170,000 miles is really right in the life expectancy for a German automatic transmission. Especially now that the dealers are not recommending regular transmission services anymore. It sounds like you may have a...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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.