Build thread

FDEEZ · Postby **FDEEZ** » Tue Sep 30, 2014 9:14

^Ditto. You may not need help, but I'm available Saturday if you need it.

speedjunkie · Postby **speedjunkie** » Tue Sep 30, 2014 9:14

Thanks guys! It looks like the new ignition switch worked, but only time will tell. I posted this on 7club and also on RCC...

During a rebuild I decided to rewire my fuel pumps again, and followed Cohbra's write-up here...

http://www.rx7club.com/3rd-generation-specific-1993-2002-16/how-dual-fuel-pump-wiring-pump-fail-indicator-lights-998596/

I'm having no problems with that part of the system, my problems start in the stock part of the wiring.

When trying to start the car after the new rebuild, we were having issues starting it with the Adaptronic and thought maybe the injectors weren't firing or something, so I put my old PFC back in and I either got no fuel pressure right away, or it happened shortly after, I don't remember which. Either way, I jumped F/P and GND in the diagnostic box and got fuel pressure and we started the car on that and it actually ran perfectly. I troubleshot the lack of fuel pressure that time for a few days and then remembered the problem seemed to show when I put the PFC in. I swapped the Adaptronic in and I got fuel pressure again, but still haven't been able to start the car. The other night, the no fuel pressure problem came back. After troubleshooting, we've traced it to the green circuit opening relay (or fuel pump relay as it's called in the 93 manual), but I tried three different known-good green relays and none of them cured the problem.

I made this to show where I get voltage, but it doesn't show everywhere because I mainly checked the green and yellow relays.

This one shows where I understand the power to go (in red, and correct me if I'm wrong), and if I jump the green relay, where the power goes from there (in blue).

While doing the rebuild, I noticed a couple wires that got damaged by the driver's side wheel, so I'm thinking this might have something to do with my issues.

I also had some issues with slow cranking, but I got a new ignition switch and it seems to have fixed that problem. Although sometimes the problem was intermittent before, so only time will tell if it's truly fixed.

I did continuity checks on the wiring and it all seems to be good. For some reason the green relay just isn't closing and it happened out of the blue and with both ECUs. I might put in a stock ECU just to see if it'll start.

I'm really stumped as to why this is happening. Does anyone that's better with wiring have any ideas?

Postby **RX-7 Chris** » Wed Oct 01, 2014 9:14

thinks about saying I told you so, hehe.

It'll work now.

speedjunkie · Postby **speedjunkie** » Wed Oct 01, 2014 9:14

I'm not sure what you're talking about lol.

speedjunkie · Postby **speedjunkie** » Fri Oct 03, 2014 9:14

I messaged with Elliot White of Turblown again last night and discovered that my firmware on the ECU was still the old version, and I found the fuel map on the Adaptronic forums that he wanted me to get so I have that now too and made a few small adjustments. I might try to call him and go over a few things in the fuel map before I try to start it again.

I also discovered the tach, the boost controller, nor the ECU show RPM while cranking. Sigh

speedjunkie · Postby **speedjunkie** » Fri Oct 03, 2014 9:14

Somehow I got fuel pressure again. Tried to start the car on the map I got from the forum and it almost wanted to start, so I'm going to mess with the fuel a bit I think.

lOOkatme · Postby **lOOkatme** » Fri Oct 03, 2014 9:14

When I tuned Geoffs car, I noticed that the stock ports like a lot of fuel, much more at idle than street ports.

just an observation.

speedjunkie · Postby **speedjunkie** » Fri Oct 03, 2014 9:14

I got it to start and it died after a few seconds. I upped the fuel a bit and set the ignition split to zero. More tinkering ahead.

Also, the belts are squealing horribly lol.

speedjunkie · Postby **speedjunkie** » Fri Oct 03, 2014 9:14

lOOkatme wrote:When I tuned Geoffs car, I noticed that the stock ports like a lot of fuel, much more at idle than street ports.

just an observation.

Ok thanks! I'll try that.

speedjunkie · Postby **speedjunkie** » Fri Oct 03, 2014 9:14

I tried dumping more fuel in but it didn't help. I dropped that back down incrementally and did a negative split on the ignition and it started, and I fluttered the throttle at the TB and kept it running for longer, but it didn't want to too bad so it died again lol.

speedjunkie · Postby **speedjunkie** » Fri Oct 03, 2014 9:14

I guess I tried too much negative split because it seemed like the engine was trying to turn backwards lol.

lOOkatme · Postby **lOOkatme** » Fri Oct 03, 2014 9:14

speedjunkie wrote:I tried dumping more fuel in but it didn't help. I dropped that back down incrementally and did a negative split on the ignition and it started, and I fluttered the throttle at the TB and kept it running for longer, but it didn't want to too bad so it died again lol.

The tough part about this is you need to be right in the whole upper left cells region to get it running and be able to run it at 2000 rpms or something. so you need to have the right timing up there and enough fuel.

speedjunkie · Postby **speedjunkie** » Fri Oct 03, 2014 9:14

Now I don't believe I had too much negative split because I took out quite a bit and it still had the issue, which I now think was caused by slow cranking. I guess I still have that problem intermittently.

speedjunkie · Postby **speedjunkie** » Sat Oct 04, 2014 9:14

lOOkatme wrote:The tough part about this is you need to be right in the whole upper left cells region to get it running and be able to run it at 2000 rpms or something. so you need to have the right timing up there and enough fuel.

That's my problem, I don't know enough about tuning just yet. I'm just tinkering with it at this point and seeing what happens.

speedjunkie · Postby **speedjunkie** » Mon Oct 06, 2014 9:14

Jesse came over today. We put the Power FC back in and he tuned it a bit with the commander. It started and ran for a while. He revved it and ran it long enough to burn all the assembly lube and Vaseline out. It even idled around 670. Now if I can just get it to run this way on the Adaptronic.

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