Well after waiting on the ECU for 5 months, it arrived, and Jason (Tapout) and I got to work installing it and making sure the Summit was wired up correctly. Paul (Requin6) installed the MEVI for me a month or two ago. The CEL came on after putting the ECU in, but the car ran fine. After tinkering with the Summit, and getting it to recognize my RPM signal, we took it for a ride.

To be honest, I was expecting more from the JWT/MEVI combo. The Summit indicates that the MEVI is opening, but it just doesn't feel as fast as I thought it would. However, hitting a dry 65 shot with low bottle pressure sure pushed me back in my seat. Good stuff so far.

Until I checked the codes. The ECU is a spare one JWT had lying around, I assume from a 96 5M, since the 96 auto I sent them apparently wasn't going to work (even though they originally said it would). I was expecting a few meaningless codes...but not eight. Here they are:
0803- Manifold absolute pressure sensor or circuit fault
1302- Manifold absolute pressure solenoid valve or circuit fault
0801- Vacuum cut bypass valve of circuit fault
0402- Fuel tank temperature sensor or circuit fault
1305- Fuel pump control module or circuit fault
0903- EVAP canister vent control valve circuit fault
1008- EVAP canister purge control valve circuit fault
0807- EVAP canister purge control valve solenoid

I'm going skiiing tomorrow, and I have to drive my car on the 200 mile trip. I would like to be sure nothing is going to crap out on us on the drive. I already reset the ECU, but haven't been able to drive it yet and check for the codes again. What do you guys think about the codes? Could they be leftover on the ECU? Or could all these things go wrong with the installation of the ECU and running nitrous? I forgot to purge the line before spraying, which worries me a little.

Last but not least, I would like to thank those who helped get this car running. Paul, for getting the MEVI on. Patrick for tweaking the stereo, and all sorts of other things. Jason (gOd) for the nitrous, custom gauge console, Summit wiring blah blah blah....without these guys my car would still be stock. Jason put in 3 days of work getting my car running and pretty. Thank you guys very much We got some smart people on this site.

 

DAmn, that might be some sort of record. Sorry, I can't help, but driving on a roadtrip with that many codes would make me nervous. Can't catch a ride with someone else?

 

I'm a newb to all that but I would think you should go over every single connection with the MEVI...sounds like something isn't right.

Have you tried putting your old ecu in to see if it picks up the same codes? Maybe if it doesn't pull up any codes you can use it for your trip and worry about the JWT when you get back.

Screw getting stranded 200miles away from home.

 

sounds like a good idea MrEous ! sorry about the codes, good night ! think i had about 5 once

 

I think mike got most of those same codes when he put a maxima ecu in his 96 I30. I30s and maximas, at least the model year 1996, have differences in their emissions systems strangely enough. Mike can probably elaborate.

 

The fuel pump stuff is the only thing that would worry me. The other stuff is more emissions. I think the EVAP thing the the thing on top of the manfold that the MEVI does not have a place to bolt down on. The MAP sensor thing is the "boost" sensor. Check the connections and the vaccuum lines.

 

All that is due to having a Maxima ECU in a I30. Been through that already and got the same codes. Car will be/run fine, just the CEL's.

 

Has the ECU been programmed to take into account the nitrous being used in conjuction with it?

Also did these codes appear during runs without nitrous as well?

JP

 

Yes, a daughterboard has been installed to take care of the nitrous. I pulled the codes after spraying a little bit. I reset the ECU and as soon as I started the car the CEL was already back on. I guess I'll have to live with it. The car ran fine on the trip and got back just fine.

Mike- Did you have every single one of the codes, or just most? This will make checking codes much more difficult and annoying...

 

I think that Summit switch is screwy. I had the Harlan switch and it flaked out on occasion and then got the Summit switch because people said it was flawlesss in it's operation. It turns out my Summit switch flaked out a lot more the Harlan switch. I am almost convinced the Summit switch does something strange like opens the valves slower (I don't know how that's possible) or flutters the valves because when I'd hit the designated rpm point, I rarely heard any induction sound change even though I verfied the thing to work when revving the engine. With the Harlan switch, it was very clear when the valves opened because my car sounded like a madd VTEC yo' when the butterflys opened. I even had a toggle switch incorporated with my Harlan switch so that if the Harlan flaked out on a 1/4 mile pass, I could open the valves myself. When I manually opened the valves there was that same change in induction noise. IMO, a change in induction noise means the thing is working. If you don't hear anything, then chances are it isn't.

As for the power increase with the MEVI on the switchover, it's not like a turbo, you won't feel a thing. You'll just notice the motor pulls after 5800rpms. There's no dramatic HP increase occuring, the power is just sustained longer.

 

Yep, those exact same codes

 

So what could be done to accurately tell me if it indeed opens? Are there any precautions I could take to help the Summit work better? I can't believe that there is no reliable way to get the MEVI to work all the time. It also seems odd that the noise is so much more noticable with the Harlan....Too bad I just bought a new Summit switch

 

I would not be worried. Dave is the only one I know of who has had problems with the Summit switch. It worked for me just fine...much better than the Harlan did.

You could hook up something to the actuator arm that completes a circuit so that when it opens it will trigger an LED inside the cabin. I thought about doing this many times but never got around to it. I know a local guy to me had an LED hooked up to do that.

 

Yeah, I was thinking about setting up an LED, but wasn't sure how to do it.

Jason and I finally got the bottle heater wired along with the A/F gauge and switches. We put the 2 gauges in the double din in the dash, and it looks awesome. With about 1000 psi in the bottle, this 65 shot feels soooo nice. I'm pretty much speechless. After I put in some new plugs it will be time to dyno

Oh, pics and maybe vids coming soon.