4 port engine in mt car
#1
4 port engine in mt car
heres the story just picked up a very nice clean low rust 2005 rx8 for dirt cheap kid i bought it off says the motor is blown wont run right. so go look at it car is clean but wont idle very well. so i bought it with the thought of just putting a scrap yard motor in it. now that i got it home and have checked it over looks like someone put a 4 port motor in a mt car. so is there any why to get this to run right or just easier to get junk yard motor and swap?
#2
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What a question!
Things to check: is it running a four port ECU? Four port fuel injectors? Check the ignition components, they wan wear out fast. Clean the air filter, inspect and clean the MAF. If all of that is ok, a rotary compression test will be needed. If the compression test fails, the only thing that will make it run properly is a tear down and rebuild.
The 4 port can certainly run and run all for daily driving, but the gears for the six speed US market transmission are not a good match for the 4 port engine. (If it's a five speed transmission, it's possible you have a JDM or Eurpoean drivetrain. They have been imported before).
Things to check: is it running a four port ECU? Four port fuel injectors? Check the ignition components, they wan wear out fast. Clean the air filter, inspect and clean the MAF. If all of that is ok, a rotary compression test will be needed. If the compression test fails, the only thing that will make it run properly is a tear down and rebuild.
The 4 port can certainly run and run all for daily driving, but the gears for the six speed US market transmission are not a good match for the 4 port engine. (If it's a five speed transmission, it's possible you have a JDM or Eurpoean drivetrain. They have been imported before).
#3
4 port ecu wont run cause it looks for the auto trans. not sure on injector how do you tell? cleaned air filter cleaned maf and ecc kid said it had compression test 90-95 psi
#6
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Does it have distinguishing features that may conclude if it not an american market car? Things like a lip spoiler, rear fog light, popout headlight washer nozzles, french or german writing on the door jamb?
You can call Mazda north America with the VIN to get the history of the car. At least the correct engine configuration
You can call Mazda north America with the VIN to get the history of the car. At least the correct engine configuration
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
#9
its a canadian car english on door jambs and stickers. ill msg mazda with vin.
the car runs just keeps getting apv codes. got a few things to do before i can get it on road then see how it drives.
the car runs just keeps getting apv codes. got a few things to do before i can get it on road then see how it drives.
#12
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4 port engine and speed trans were the low power option in Japan. Those motor / trans combos can be bought cheap. Someone probably blew your old motor, replaced it with the JDM stuff and left the previous ECU (4 port ECU would not throw an APV error....it never had an APV).
Your best bet? Find a wrecked 4 port (2004 or 2005 automatic) and buy its ECU and ABS box. Ask a Mazda dealer to reprogram your keys to that ECU. Replace ABS box yourself.
Your best bet? Find a wrecked 4 port (2004 or 2005 automatic) and buy its ECU and ABS box. Ask a Mazda dealer to reprogram your keys to that ECU. Replace ABS box yourself.
#13
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4 port engine and speed trans were the low power option in Japan. Those motor / trans combos can be bought cheap. Someone probably blew your old motor, replaced it with the JDM stuff and left the previous ECU (4 port ECU would not throw an APV error....it never had an APV).
Your best bet? Find a wrecked 4 port (2004 or 2005 automatic) and buy its ECU and ABS box. Ask a Mazda dealer to reprogram your keys to that ECU. Replace ABS box yourself.
Edit: the 4 port motor has a different red line and power band than the six port. You cannot trust your tachometer, you will have to shift early. 4 port should give you the warning beep at 7500, 6 port won't beep until 9000.
Your best bet? Find a wrecked 4 port (2004 or 2005 automatic) and buy its ECU and ABS box. Ask a Mazda dealer to reprogram your keys to that ECU. Replace ABS box yourself.
Edit: the 4 port motor has a different red line and power band than the six port. You cannot trust your tachometer, you will have to shift early. 4 port should give you the warning beep at 7500, 6 port won't beep until 9000.
Last edited by BigBadChris; 06-05-2016 at 08:55 PM.
#15
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Edit: please see this thread. This is where I got my information, and the thread I am referencing for my ongoing 4 port to 6 port swap
https://www.rx8club.com/series-i-spe...t-swap-151684/
Last edited by BigBadChris; 06-06-2016 at 09:26 PM.
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