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post #1 of 6 (permalink) Old 12-30-2018, 08:56 PM Thread Starter
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Engine swap no start no injector pulse

Has anyone done an engine swap successfully? I have swapped an Australian spec 2004 2.3L engine and 4 speed auto from a GG Mazda 6 (my old car) into a 11/2003 GG Mazda 6 shell (my new car). I cannot start the mutha. The starter motor turns but the engine doesn’t fire up. (Strangely, when I change to my old ecu, the starter motor doesn’t turn and I see the immobiliser check light flashing rapidly).

When spraying hydrocarbons into the throttle body the engine seems to want to fire up suggesting I’m getting spark. The spark plugs and cylinder bore is totally dry suggesting injectors aren’t firing. There’s plenty of fuel as tested by removing the fuel line and draining into a bucket while engine is cranked. All electrical connections have been checked countless times.

Is there a BCM or immobiliser module I need to swap over from my old car? I cannot find any modules except for the ecu at the footwell and Visteon remote box under the drivers dash. There appears to be no BCM in my car (ie. grey box with multiple plugs). I have looked in the engine bay near the battery/fuse box/engine bay as well under dash/glove box, under seats and found nothing. There’s only a fuse junction box with fuses (as pictured under glove box) but I have swapped this from my old car too without success.

Help is much appreciated.
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post #2 of 6 (permalink) Old 12-31-2018, 11:03 AM
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The keys, steering column, instrument cluster and PCM/ECU all must match for the car to run properly. Someone with a dealer level scan tool can also do the flashing. Be careful not to put it into theft mode as that requires a dealer level scan tool to flash it to run.

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post #3 of 6 (permalink) Old 12-31-2018, 01:37 PM
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Quote:
Originally Posted by b1lk1 View Post
The keys, steering column, instrument cluster and PCM/ECU all must match for the car to run properly. Someone with a dealer level scan tool can also do the flashing. Be careful not to put it into theft mode as that requires a dealer level scan tool to flash it to run.
I recently changed my standard instrument cluster for an electroluminescent specimen and had no issues. 06/2004 GY into 05/2004 GY. It would seem the US instrumentation is exempt from this security issue.

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post #4 of 6 (permalink) Old 12-31-2018, 08:01 PM Thread Starter
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Quote:
Originally Posted by b1lk1 View Post
The keys, steering column, instrument cluster and PCM/ECU all must match for the car to run properly. Someone with a dealer level scan tool can also do the flashing. Be careful not to put it into theft mode as that requires a dealer level scan tool to flash it to run.
Interesting. I was able to run my old car with a generic blank key so how does the steering column and cluster sense things don't match up? Also if the ecu is in theft mode will it stay in that state forever and useless unless dealer reset?
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post #5 of 6 (permalink) Old 01-01-2019, 09:59 AM
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Engine swap no start no injector pulse

@mazda6thsense Is it possible that an immobilizer was optional on the Australian spec models? In that theory if the donor car did not have one and the new one does it could be possible thatís your problem you could try swapping the computers and ignition from the old car and see if that makes a difference. I donít think it has anything to do with the instrument cluster because as DrFeelGood I too have swapped mine for the electroluminescent ones with no issues.


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post #6 of 6 (permalink) Old 01-01-2019, 09:53 PM Thread Starter
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There seems to be an active immobiliser on these models evidenced by lack of cranking with old ecu and security light flashing but it's a question of how to overcome it. I'll check other things with new ecu since i at least get cranking before resorting to changing ignition barrel.
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