Skip the auto shop - Our mechanics make house calls

Q: Automatic transmission problems after engine swap

asked by on

My Mitsubishi Space Wagon 2001 engine was replaced with a 2000 Mitsubishi Gallant engine and now the automatic transmission keeps reviving up once it is in gear 3 before engaging, and revs up at exactly 50 km/hour, then same thing when slowing down too.
My car has an automatic transmission.

A: Hello there, thanks for writing in. If the...

Hello there, thanks for writing in.

If the issue occurred after the engine was swapped, then it may be possible that the issue is related to the swap. The symptoms you describe can be caused by a variety of issues from the swap. If you suspect the problem is transmission-related, a few things I would check are the fluid level, shift solenoids, the pressure switch. Similar symptoms can also be caused by problems with the vehicle’s engine management system.

If you would like help diagnosing this issue, consider having an expert automotive technician from YourMechanic come to your home or office to inspect your vehicle for you, and make or suggest any repairs as needed.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Burning smell from car

Was the garage closed or open? Have you noticed this smell at any other time? There may not be a problem at all. Remember that catalyst converters get hot and cars run a lot hotter than they use to. Perhaps...

Q: Ignition problems with my Mitsibushi Galant.

Hi there, I hope I can help get to the root of your issues. It appears you are having issues starting the engine in your Galant. Depending on what symptoms you are experiencing, we may be looking at an issue...

Q: I changed the motors and it starts and runs great at low rpm. If I try to accelerate it sputters and falls on its face.

Hi there. Check all of the vacuum lines to the engine and make sure that they are all connected or plugged off if they are not needed. Check the spark plugs and see what condition they are in. If the...

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...
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...
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...