VQ35deMax

iTrader: (6)

Well put the stock maf housing back in with a working maf. Nothing changed. I set the switch to 0 and the car ran even worse. So I put it back on switch 1 and the car idles better but still really rich.
Aps 550cc map is uploaded with -19 all the way down in the 0% column.

I feel like I hit a dead end.
Any suggestions where to go from here?

mx594

iTrader: (4)

So it runs that rich even if you turn your fuel pressure down to say, 30 psi?

The ecu does have a minimum effective injector pulsewidth. This can be changed with Osiris...but I have never heard of anyone with a UTEC and 550cc injectors having a problem with it.

VQ35deMax

iTrader: (6)

IF fuel pressure is turned down, the vehicle stalls and cranks but does not start. Fuel pressure is set right now at 51psi.

The IAT code p113 is pending right now.
I gave more negative numbers in the 0% column (-20). The changes take effect and the a/f ratio goes up and then back down to 10.9-11.1. Also the car idles for a couple of minutes and then stalls.
However I was able to hook up my scanner and monitor bank 1 sensor 1 and 2 o2 sensors. At 2k rpm, bank 1 sensor one is at .910 volts while bank 1 sensor 2 is at .130 volts.

It just seems like what changes I make in the Utec are no staying permanently.

Chris@FsP

iTrader: (4)

Bad UTEC?

Also, be careful how long you let it idle at such rich AFR's. You don't want to wash out the cylinders.

VQ35deMax

iTrader: (6)

Well today I removed the primary o2 sensors. They were black from the unburned fuel. I replaced them with 2 used but working o2 sensors.
Then I changed the base map to a Tnetics as well as the parameters. Car started right up and was running fine and then returned back to the same state.

I have copied over my base map as well as a log. Maybe you guys have some ideas.


6067
Turbonetics 550cc FUEL (x10 ms) TURBOXS 350Z (Version 2.8d)(c) 2006

RPM 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
500 -15 74 76 80 81 88 92 92 92 92 92
750 -15 76 78 82 83 91 95 95 95 95 95
1000 -15 78 80 84 85 94 98 98 98 98 98
1250 -15 80 82 87 88 97 101 101 101 101 101
1500 -15 82 84 88 87 101 105 105 105 105 105
1750 -15 87 89 93 99 103 110 110 110 110 110
2000 -15 91 95 99 105 106 112 112 112 112 112
2250 -15 96 101 104 112 113 119 119 119 119 119
2500 -15 99 105 113 116 114 120 124 124 124 124
2750 -15 101 107 116 117 119 124 127 127 127 127
3000 -15 101 107 115 117 120 125 125 125 125 125
3250 -15 102 103 111 117 123 130 128 128 128 128
3500 -15 101 103 111 117 128 133 134 134 134 134
3750 -15 101 103 112 118 130.5 137.5 138.5 138.5 138.5 138.5
4000 -15 101.5 104 114 120 135 145 148.1 148.1 148.1 148.1
4250 -15 102 105 118 125 138 153 156.4 156.4 156.4 156.4
4500 -15 102 112 123 129 140 157.6 162.5 162.5 162.5 162.5
4750 -15 108 114 126 130 142 158.6 164.5 164.5 164.5 164.5

And the log
REPLAY : PAGE 8 OF 8 TURBOXS 350Z (Version 2.8d)(c) 2006

Load Knock Mod Mod Mod
RPM MAP MAF TPS Site Count Inj#1 Ign#1 Inj#1 Ign Fuel MAF
psia V % mS deg duty deg % V

752 -10.0 1.47 0 00 00 2.01 +16.5 1.2 ECU. +0.0 1.25
750 -10.0 1.47 0 00 00 1.98 +16.5 1.2 ECU. +0.0 1.23
782 -10.0 1.45 0 00 00 2.00 +16.5 1.2 ECU. +0.0 1.21
815 -10.1 1.47 0 00 00 2.01 +15.5 1.3 ECU. +0.0 1.21
765 -10.1 1.41 0 00 00 2.00 +14.5 1.3 ECU. +0.0 1.21
772 -10.1 1.47 0 00 00 2.00 +16.5 1.2 ECU. +0.0 1.19
789 -10.1 1.47 0 00 00 1.99 +15.4 1.2 ECU. +0.0 1.23
782 -10.1 1.43 0 00 00 2.00 +16.5 1.2 ECU. +0.0 1.23
769 -10.1 1.43 0 00 00 2.00 +16.5 1.3 ECU. +0.0 1.21
773 -10.0 1.41 0 00 00 2.00 +15.4 1.2 ECU. +0.0 1.23
782 -10.1 1.45 0 00 00 1.99 +16.5 1.2 ECU. +0.0 1.21
765 -10.1 1.45 0 00 00 2.00 +16.6 1.3 ECU. +0.0 1.21
790 -10.1 1.45 0 00 00 1.99 +15.5 1.2 ECU. +0.0 1.21
801 -10.1 1.45 0 00 00 2.00 +16.5 1.3 ECU. +0.0 1.21
770 -10.1 1.45 0 00 00 2.00 +16.6 1.3 ECU. +0.0 1.21
748 -10.0 1.45 0 00 00 1.99 +17.6 1.2 ECU. +0.0 1.21

<CTRL-x> : Exit to Main <space> : next screen <TAB> : previous screen

VQ35deMax

iTrader: (6)

Well a little update.
Stock injectors back in. Utec on switch 0 which is stock ecu. Fuel pressure is at 51 psi.
My wideband is still reading the same a/f ratio as before with 600cc injectors. Hooked up my obd2 reader and the primary o2 sensors are still reading rich at almost a volt.
Unhooked the primary o2 connectors and no change either.

So something else is wrong. I want to burn the car with fire at this point.

little update
Checked the signal wire from the o2 connector to the ecu connector and that checks out.
What else can be wrong???

VQ35deMax

iTrader: (6)

Any suggestions from anybody?
What would happen if i turned off open loop fueling on the utec?

djamps

iTrader: (1)

First of all try removing the UTEC...

VQ35deMax

iTrader: (6)

Just A little Update. I removed the utec and the car started right up. After it warmed up, the a/f ratio was fluctuating around the 14.7 area mark like it is supposed to. So this leads me to believe that there is something wrong with the utec I have. Reason being is that even it being on the 0 switch and the car being on stock injectors, the utec was making the car run rich. Once the utec was by-passed and the stock ecu took control again, the car runs perfect.

Any advice?

Thanks

djamps

iTrader: (1)

How do you know the switch is on map 0? on my UTEC there were no markings and the switch could do a full 360 LOL so try every position. If you're using an external switch try disconnecting it and messing with the built in one instead, perhaps the wiring is messed up.

VQ35deMax

iTrader: (6)

The dashboard shows witch position the switch is set at. I also have tried numerous positions on the utec and tried various maps as well.
No external map switch is being used as well.

VQ35deMax

iTrader: (6)

I emailed TurboXS with the same question. How come the Utec is trying to manipulate the signal that is entering it with the switch on 0 the same way as if the switch was set to a different position and a map uploaded to it?
Just to be safe I checked over the wiring from the sensors (injectors,maf,crank) to the ecu connector and it checks out.
So for a fact I know that it is not wiring and it is not the stock ecu and the stock sensors. As soon as the Utec is plugged back in and the car is on stock injectors, the utec is changing the values and making the car idle at 10.7-11.1 a/f. Without the Utec the car idles perfect and has a normal a/f ratio.

Could it be a bad Utec?

djamps

iTrader: (1)

Could be bad...

Have you grounded the black wire coming off the large white molex plug? This is the injector circuit ground and if left unconnected (or improperly grounded) might cause odd issues. In my case it didn't make any diff. but I've read from many people that it helps.

VQ35deMax

iTrader: (6)

I grounded the black wire and re-checked every possible aspect that would result in this issue.

Honestly guys I got fed up with it and just sold the Utec. Any advice on what to use next for engine management? Something that is proven to be without hick ups.

djamps

iTrader: (1)

I hope you told the guy about the issue, obviously there is something going on with that UTEC.

I've got a known-working one sitting here if you are ever in the area and want to try it.

WTFMike

iTrader: (2)

It is issues like this that concern me about using Utec. The more I read about them it the more issues I learn about. Are there any Utec users that are happy with using Utec? I have read a lot of negative Utec threads and very few positive ones.

djamps

iTrader: (1)

Contact jeffie or nyqueenz on this forum I know them both and they are running UTEC both stock ~400whp and build engine 500+whp respectively. The thing with the UTEC just like any other aftermarket EMS is it either works fine or it doesn't work right at all. Just make sure your seller guarantees it to be in working condition before you close the sale.

VQ35deMax

iTrader: (6)

I did let the seller know that there was issues with the utec.
Question though. Why did you go with a reflash instead when you had the utec?

djamps

iTrader: (1)

I just wanted to try something different. I also had an occasional limp startup, maybe 1 out of 50. But it got the job done and actually had slightly higher whp numbers than my Uprev tune .

VQ35deMax

iTrader: (6)

I sent you a pm regarding it