Subject	ECU was swapped out.
Posted by	Woody75 (Denver) on October 26, 2021 at 10:27 PM
	This message has been viewed 236 times.
In Reply To	Re: Need help with low rpm engine stumble issue. posted by Metacom on October 26, 2021 at 07:42 PM
Message	Put a JWT tune in it as well. Ran the same. He runs 91 octane. Multiple fill ups by now with it being years of driving it like this. Wasnt like this for the timing belt years ago or it would have never left my shop. This happened at some point after. Crank/pulley keyway is good. I had pulley off to inspect when I tore it apart to check the timing belt and such. I put engine at top dead center as well, pulley timing mark lines up at zero on the timing range on the lower cover. I also checked VTC function at idle turning them on. Both are working and not stuck. >
Follow Ups	Need help with low rpm engine stumble issue. - Woody75 (Denver) 18:06:17 10/26/21 Re: Need help with low rpm engine stumble issue. - Metacom 19:42:01 10/26/21 Also... - Metacom 19:54:47 10/26/21 Aftermarket vacuum gauge in the car reads where it should. - Woody75 (Denver) 22:28:48 10/26/21 Re: Aftermarket vacuum gauge in the car reads where it should. - Metacom 22:56:28 10/26/21 Ok, thats pretty much what we have then. - Woody75 (Denver) 08:27:18 10/27/21 Re: Ok, thats pretty much what we have then. - Metacom 14:23:56 10/27/21 Vacuum test details here that Metacom refers to>>>>>>>> - ZUL8TR 04:36:34 10/27/21 ECU was swapped out. - Woody75 (Denver) 22:27:20 10/26/21 Re: ECU was swapped out. - Metacom 14:22:08 10/27/21 Power balance test. - Woody75 (Denver) 14:51:14 10/27/21 Replace the VTC gears & solenoids, redo timing. - Bernie (NoVA) 00:44:03 10/27/21 VTC gears tested good. - Woody75 (Denver) 11:01:56 10/28/21 Re: VTC gears tested good. - Metacom 13:59:01 10/28/21 Re: Re: VTC gears tested good. - Metacom 14:06:24 10/28/21 Wiring harness. - scorp997 15:33:23 10/28/21 I tested the harness from the ECU to each injector. - Woody75 (Denver) 15:55:38 10/28/21 Possibly fuel pump controller low or mid speed not - LitlElvis 11:54:18 10/27/21 Wouldnt that show in the fuel pressure readings? (n/m) - Woody75 (Denver) 14:40:46 10/27/21 Probably - wasn't sure if you were monitoring fuel pressure - LitlElvis 13:43:27 10/28/21 I said this too but Woody didn't believe me. (n/m) - Bernie (NoVA) 00:20:35 10/28/21 Neither did Mike :) (n/m) - Woody75 (Denver) 09:47:01 10/28/21 Update: Put in different FPC, no change. (n/m) - Woody75 (Denver) 11:39:36 10/30/21 Check out this post from a Z31 owner, similar symptoms - Polishzx 00:09:53 10/28/21 After thinking over this for awhile I'm going to toss - Ghoztt (MD) 15:23:24 10/28/21 Does the car have an EGR valve? (n/m) - mrchips 07:23:38 10/30/21 Actually I just played with that this morning. - Woody75 (Denver) 11:41:27 10/30/21 Updates: Tried a few more things today. - Woody75 (Denver) 11:47:22 10/30/21 Did smoke test include the engine. Intake leak check. - mrchips 06:38:07 10/31/21 Yes, smoke test from the intake tube. - Woody75 (Denver) 11:03:11 10/31/21 Your symptoms sound similar to what I've been - black300zx 16:59:12 11/06/21 Another update: - Woody75 (Denver) 09:27:47 11/08/21 Brutal... Could you try testing fuel pressure in some other - Polishzx 02:05:39 11/09/21
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