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

217,565

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

Add photo

Related Questions

Millenia

Looking for a Used Millenia in your area?

CarGurus has 102 nationwide Millenia listings and the tools to find you a great deal.

ZIP:

Search Mazda Millenia Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Mazda Millenia Experts

#1 Steven Cisneros
Steven Cisneros
Reputation 690
#2 Keith12345
Keith12345
Reputation 400
#3 Tom Demyan
Tom Demyan
Reputation 230
View All

Related Models For Sale

Used Honda Accord
1,011 Great Deals out of 75,848 listings starting at $899
Used Toyota Camry
1,209 Great Deals out of 97,654 listings starting at $1,250
Used Nissan Maxima
391 Great Deals out of 24,517 listings starting at $999
Used Nissan Altima
1,080 Great Deals out of 83,025 listings starting at $1,988
Used Chevrolet Impala
919 Great Deals out of 35,385 listings starting at $1,700
Used Honda Civic
857 Great Deals out of 71,131 listings starting at $1,200
Used Acura TL
303 Great Deals out of 7,603 listings starting at $2,450
Used Mazda 626
264 listings starting at $1,950
Used Hyundai Sonata
694 Great Deals out of 49,390 listings starting at $1,989
Used Toyota Avalon
306 Great Deals out of 13,879 listings starting at $2,499
Used Jeep Grand Cherokee
914 Great Deals out of 66,710 listings starting at $1,500
Used Ford F-150
3,103 Great Deals out of 209,129 listings starting at $1,200