Tried to make it as clear as I could this time, but again, limited tools to work with lol
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10-18-2017, 05:19 AM | #47 (permalink) | |
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Last edited by Jhill; 10-18-2017 at 05:22 AM. |
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10-18-2017, 05:39 AM | #48 (permalink) |
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You Guy's are both plugging away at it!
Glad you got someone w/more knowledge helping you Z ealot! As none of my good contacts have got back w/me on this. I read through most of what you guy's are doing; don't forget PCV valves & grommets. And at this milage-probably wouldn't hurt to install new injectors (if you haven't already did this),,,Also when you remove plenum for gasket-inspect for oil residual/build up....may be time for catch cans. You're gonna get it-I'm confident.
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10-18-2017, 09:12 AM | #49 (permalink) | |
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One thing that i did try and this was purely by mistake is that i forgot to plug in the driver side maf when i reset the ecu, when i started up the car it ran really smooth but would not let me rev above about 1500rpm if that tell you anything Sent from my iPhone using Tapatalk |
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10-18-2017, 09:19 AM | #50 (permalink) | |
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Thanks for the info jc i did replace the pcv valves about a month ago as i had noticed a lot of oil residue buildup on the intake manifold, fast forward to my visual inspection that i did on the injectors and i noticed the intake manifold is now clean after running the new pcv valves for a month Sent from my iPhone using Tapatalk |
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10-18-2017, 09:22 AM | #51 (permalink) | |
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10-18-2017, 07:21 PM | #52 (permalink) | |
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I tested the engine with no mafs connected again after i got home today, results are interesting to say the least. From cold start with both mafs disconnected the rpm’s fluctuated between 1500 and 2500 rpm until the engine coolant temps were up to spec at which point the rpm’s flattened out to about 1100rpm and only once about every 20 to 30 seconds the rpm’s would dip down to about 600 and then clim back up to 1100. Just a note, but i decided to check and see what fuel trims were doing after everything was warmed up. Long terms were pegged at 0 for both banks while short terms were pegged at -25% and would go to 0% when the rpms dipped to 600 and climb back to -25% when rpms came back to 1100. I tried driving the car while the mafs were disconnected, it would not let me go past 2500rpm, but seemed smooth otherwise. I recorded a few minutes of data while the mafs were disconnected that I’ll upload here shortly and see if we can glean anything from that if necessary. Sent from my iPhone using Tapatalk |
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10-18-2017, 08:32 PM | #53 (permalink) | |
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10-18-2017, 08:44 PM | #54 (permalink) | |
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10-18-2017, 11:44 PM | #56 (permalink) |
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Well it won’t have a load calculation because it gets that through the mafs. Without any load calc it will run like alpha n (rpm&tps) and use a map they know will run from internal testing. This will typically error rich and probably reduced timing (not an ideal running but something that is ensured to run). Again have not tested on Nissan to know if they just go to a total limp mode but others makes that I have disconnected mafs and driven for testing none come to mind that will go to a complete limp mode, in the past it was a good way to know if the maf was bad if it ran better without (although it could also mask a minor vacuum leak). So with yours disconnected your stft is pegged -25 and your AF’s are still indicating a rich condition. I’m not surprised it’s rich as I would suspect it to error rich but I’m a little confused by the stft. This may all be normal for Nissan, maybe with no load calc they just dump fuel and then the AF max rich causing the stft to peg -, I’ll have to see what mine dose.
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10-19-2017, 02:23 AM | #57 (permalink) |
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Ok so I went and tested my own and I think I have to apologize for leading you down a wrong path. Apparently Nissans absolutely will not run with the mafs disconnected, mine wouldn’t even start. I even disconnected while running to simulate a signal loss, it will barely run with one but dies with two and then no start, guess your stranded if you lose maf on a z. I am tuned on ecutek but I doubt they would eliminate a limp mode that oem had. Guess I’ve learned something myself through this.
Last edited by Jhill; 10-19-2017 at 02:25 AM. |
10-19-2017, 03:17 AM | #58 (permalink) |
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Interesting read. Apparently Nissan does not work like other cars in terms of their fuel trims.
How to read CONSULT printout? - Nissan Forum I can confirm because my scan tool gives the oem data and I was totally lost looking for stft and ltft and could not find it unless in generic mode. Great all my years on other lines won’t do me any good if I ever start to have an issue, have to learn my own car now lol. |
10-19-2017, 03:51 AM | #59 (permalink) | |
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Interesting, so if i understand that thread correctly nissan mainly uses the af sensors to determine fuel trims. It does leave me wondering as i have only changed out my bank 1 af sensor if maybe the bank 2 sensor is throwing everything out of whack as that sensor is way overdue to be changed out? Sent from my iPhone using Tapatalk |
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10-19-2017, 11:04 AM | #60 (permalink) |
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Is it normal for there to be cracks on the outer edges of the lower intake manifold gaskets that mate to the heads?
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