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post #1 of 3 (permalink) Old May 13th, 2019, 17:16 Thread Starter
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New Member 2ZZ SWAP MR2

Hello all I am Louis. I am Currently working on my 2ZZ swap MR2. Yes I know a little bit late in the game.

I have a small/big issue that I am hoping someone here can help me with.

I have no spark to my spark plugs got fuel and f/injection power and ground to plugs. I've checked the signal from the ecu plugs to the coil pack plugs no issues there. Have also changed the Crank and Cam position sensors. Currently using 2ZZ PFC.

I did not use the swap harness so have hardwired all the plugs.

I hope this is enough information.

Thanks in advance.
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post #2 of 3 (permalink) Old May 16th, 2019, 00:16
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I can try and help with some diag, but I dont know that engine or swap at all so no promises.

Are you positive all 4 plugs arent getting spark?

If you have everything needed for the coil to fire and its not, it appears the coil would be the cause however, I would be surprised if all 4 coils died on you.

Im not exactly sure what you mean by you hardwired the harness, but I would say to double check your wiring to start

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post #3 of 3 (permalink) Old May 16th, 2019, 02:28
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For the 2zz swap, the usual method is to re-use the 1zz harness and modify just a few wires to add the lift OCV and sensor and also to re-locate the wires for the O2 sensor and one ground wire. When you do this, all the coil and injector wires remain the same on the harness. If this is what you did, and your coils are not firing, it means that either your ecu is not grounded properly, or one of the engine grounds is not connected. Check the ground wire that goes from the head above the alternator to the firewall. If this is missing, the coils may not fire.

You will get more help with this on

PS> If you are using a Euro market 2zz ECU, it has an immobilizer, and this will also prevent the coils from firing. Use a USDM or JDM ECU. [disregard this I just saw that you are using a PFC - no immo]. It's not impossible that your PFC is bad. Maybe you can get access to a stock Ecu to use for testing and also read any OBD2 codes.

Last edited by merryfrankster; May 16th, 2019 at 02:34.
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