Skip the auto shop - Our mechanics make house calls

Q: If I am replacing the engine (D17) for another (D17a2), do I need a computer to match the new engine?

asked by on

My transmission is grinding on my 2004 Honda Civic DX. On my look for a new transmission I found a trans and engine together for a good price. The engine I am looking at getting is out of a Honda Civic EX and is a D17a2 compared to my D17. The only difference is in horsepower, torque, and that it has VTEC. Do I need to find a new ECM and/or a new ECU for it to work?

My car has 143000 miles.
My car has a manual transmission.

A: Hello. Swapping form a non-VTEC to a VTEC e...

Hello. Swapping form a non-VTEC to a VTEC engine will require a different computer and wiring harness, as the two engines come equipped with similar, but different engine management systems. These parts are usually not difficult to source as these types of swaps are not uncommon.

Also keep in mind that since both motors are D17 series, it may be possible that the transmission will bolt up directly, without the need to swap the engine. Depending on the circumstances, this could be another cost efficient option to repair the issue.

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: Bake makes grinding and scraping noise.

It sounds like your brake pads are below minimum specifications. Now the brakes are grinding the rotor surface as your brakes are applied. Look at your brake caliper behind your wheel and see if the pads still have thickness to...

Q: After overhaul my Ka24 d21 doesn't rev pass 4000 rpm

Hi there. From the description you have provided, I'm not sure running a recently overhauled engine over 4,000 rpm is a good idea. There is a 500 mile break-in period recommended by most rebuilders. Change the engine oil and filter...

Q: Rough idle upon stopping.

This vibration you are feeling is a defective motor mount. I recommend you have a mechanic check the engine for excessive movement when putting the vehicle into reverse and drive to see what motor mount is bad. The mechanic should...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...