what would cause the motor to not crank after engine swap?

Asked by Mar 30, 2016 at 02:19 PM about the 1999 Mazda Millenia 4 Dr STD Sedan

Question type: Maintenance & Repair

Hey i recently did a engine swap between two identical 99's millenia's with the
2.3 engine and now the new motor wont crank over. I've tested all the relays
and i am stumped at this point. did i do something wrong or did i need to
change the ecu as well? please help i need my wheels back

3 Answers

263,805

recheck all your connections and grounds. Was the other motor running before the swap?

ya both ran I've checked all connectors and think i have the ground hooked up. do you know of any other grounds besides the one on the rear engine mount? I've leaned towards the trans. range sensor even though i have changed it out of the other car and still nothing has changeed

It's the security system in the Milli. It's no fun to correct. You need to hotwire the car to trick the system. Jump the starter solenoid with a wire to the positive side of the battery with the ignition switch turned on. Do it twice and it should turn over. Then reconnect the starter wire and turn the key. All should be good. Mazda gets 200.00 to reset the ECU.

Your Answer

Millenia

Looking for a Used Millenia in your area?

CarGurus has 55 nationwide Millenia listings and the tools to find you a great deal.

ZIP:

Mazda Millenia Experts

  • #1
    Steven Cisneros
    Reputation
    760
  • #2
    Keith12345
    Reputation
    420
  • #3
    Tom Demyan
    Reputation
    230
View All

Related Models For Sale

Used Honda Accord
1,126 Great Deals out of 71,730 listings starting at $1,100
Used Ford Mustang
581 Great Deals out of 38,593 listings starting at $1,895
Used Mazda MX-5 Miata
70 Great Deals out of 4,229 listings starting at $2,995
Used BMW 3 Series
1,095 Great Deals out of 32,548 listings starting at $1,200
Used Nissan Maxima
315 Great Deals out of 21,703 listings starting at $999
Used Subaru Impreza
204 Great Deals out of 22,341 listings starting at $1,505
Used Nissan Altima
1,276 Great Deals out of 77,328 listings starting at $1,695
Used Chevrolet Camaro
442 Great Deals out of 31,242 listings starting at $1,450

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.