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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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10-22-2014, 02:01 PM | #1 |
Sr20 running problems after tune
Hey guys hope you can help me out here, I'm having a few problems with my sr20 build and I'm a little stumped. Here are my specs:
Red top sr20 Hks actuator Garret t28 turbo @12psi New 550cc injectors purchased from circuit sport Wideband and AFR guage adj fpr currently set to 3 bar Brand new z32 maf Fresh tune from Jason Diekman aka Ecu tuner Guy Here is my problem. Upon start up my car is stumbling. Has no power and reads 10 on my AFR, which is super rich. I thought it was a maf problem so I purchased a new maf and I ohm tested the signal and ground to the ecu from the MAF connector. Wiring tested good. Also source voltage read 11.75v. MAF voltage read 10.75v. Before this problem arose I set my boost to 12 psi and stock 370cc injectors. FPR set to 70psi. Didn't drive it much because I knew I needed a maf, injectors and tune. Car ran fine to 5500 rpm then it would go above 15 AFR. Bought my injectors. Wired up a used MAF. Sent my ecu out for the flash. Car has been sitting until my ecu came in. I plugged it in, hooked my battery up and started it. I then set the fpr to 3 bar (43.5psi). I've had this problem ever since. I talked with the tuner and he said he tested it on a engine simulator so he knows the ecu was good prior to shipping. Not sure if I believe it, but that's what I was told. So ill assume that's true. So my question is what do I do next? I'm going to pull codes in a bit and post them here, but hopefully someone can help. Thanks in advanced guys. |
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10-22-2014, 02:25 PM | #2 |
Zilvia FREAK!
Join Date: Nov 2010
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I have one if Jason's tunes and he had been great in helping me troubleshoot in the past. I've gotten different retunes and stuff from him too and I trust he knows his stuff
That being said, are you getting any Ecu codes at all? If You can't confirm it was running perfect before the tune. It's likely something else is the underlying problem.
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10-22-2014, 02:34 PM | #3 | |
Quote:
Maf sensor is wired as follows: A=/ B=ECU signal C=ECU ground D=chassis ground to battery E=Source voltage F=/ |
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10-22-2014, 02:50 PM | #4 |
Zilvia FREAK!
Join Date: Nov 2010
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With the car idling(keep it running if you have to) unplug the maf. Does the idle smooth out? Can you get it to idle steady under no load, basically have it run in limp mode.
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Z32 with lq4 swap Desert Street Scene || Dssevents.com |
10-22-2014, 02:51 PM | #5 |
Zilvia FREAK!
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It also sounds a lot like a boost leak or something. With it being that rich at idle something is amiss
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Z32 with lq4 swap Desert Street Scene || Dssevents.com |
10-22-2014, 05:51 PM | #7 |
Zilvia FREAK!
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Yay. Good to hear. What in the harness was needing repair? Just so we can help future searchers find the answer if they experience a similar issue
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Z32 with lq4 swap Desert Street Scene || Dssevents.com |
10-26-2014, 11:12 PM | #10 |
Leaky Injector
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Hook the body ground up to the ground that goes to the original MAF ground wire (both z32 ground wires to stock ground) I had mine wired like yours and it ran rich and like shit, first unplug your MAF and see if it runs better before combining those! This is what mine needed now it runs awesome!
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