Skip the auto shop - Our mechanics make house calls

Q: I changed out my torque converter and didn't unhook the battery and when I put the transmission back in it spark

asked by on

I changed out my torque converter and didn't unhook the battery and when I put the transmission back in it sparked an when I get it all put back together to start it cranks but doesn't start an it started before great

My car has 180000 miles.
My car has an automatic transmission.

A: Vehicle electronics are very sensitive to v...

Vehicle electronics are very sensitive to voltage spikes. Start with checking any and all fuses, particularly those to things like ignition, fuel, and ECU. If all fuses are good, then you will have to start more extensive diagnostics. There should be a fusible link down by the starter that may have burned/blown. They are in place to protect for things like voltage spikes, however, they aren't a guarantee that other vital electronics were not damaged. Check relays for the fuel system, ignition system, etc. The voltage spike may have shorted the the engine control unit and/or the powertrain control module. If you need help having this diagnosed, a certified technician from YourMechanic can come to your home or office to inspect your starting issue in order to have the correct repairs done.

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: Car will not crank

This may potentially be related to a faulty starter relay. This is a unit that directs power from the battery to the starter solenoid which then engages the starter when you turn the key. When this is not working properly,...

Q: My passenger side window will not Roll up. It rolled down this morning but is no longer rolling up

There is a chance the window motor or a component along the circuit has experienced a malfunction. There is also a mechanical regulator and circuit protectors that can be causing this fault. Have an automotive technician, such as one from...

Q: My 2010 Audi A4 stopped out of no where at a stop sign maybe a month ago. It still has not started. All lights work

Hello. When this occurs, the first thing I do is try turning the engine over by hand. If I cannot turn the engine over by hand, then I know that the engine is seized. If it is seized, then it...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.