4CN Air

iTrader: (7)

Well my motor is in and it fires up, but stalls out immediately. Then a weird thing happens: once the engine totally dies a second or two later the fans get juice for just a second.

I'm getting fuel, I'm getting spark. Everthing seems dandy until it dies (a second after starting. It jumps quickly to around 1000-1500 rpm, hangs for a second then dies.

Are the fans some kind of signal that something specific is wrong?

Please help, I've been up for 24 hours straight getting this thing together, now this.

Also it's not flooded, I've tried unflooding it several times, used new plugs, oil in plug holes, in other words every trick in the book. I'm convinced it is something else. Combustion occurs quickly and consistently every startup, but it justs dies right away.

tiger18

iTrader: (1)

sounds like you have an electrical problem some where,,, have u tried pulling the ECU codes,,,,id try that first to see if the ECU can find any faults

Monkman33

iTrader: (28)

Honestly, I'd try a good 10 hours of sleep. Don't think about for the whole time. Wake up, eat a good breakfast, then take a deep breath and looka t it from a fresh perspective.

The worst thing you can do is work under exhausted conditions. Get some sleep. You'll be amazed at how much that will help.

Gadd

Recheck the fuel lines sound like you may have the supply and return reversed. confirm fuel pressure.

Fritz Flynn

iTrader: (263)

I think some reason the fuel pump is dieing. Check the fuel pressure before starting and after starting.

If the pressure is bad just run a hot wire directly to the pump with a 15amp (actually check out what fuse I can't remember for sure) fuse in line.

You probably already did it but I would check all the wires going to any of your mods and make sure they are all nice and clean. IOW no wires show any signs of a short etc....

dubulup

nope.

can you keep it alive w/ throttle?

could be your port work requires more air to idle...and your TB isn't calibrated correctly.

c00lduke

have you tried making it so when you start your motor your fans or AC are not going to be running?

4CN Air

iTrader: (7)

Well I have a PFC so pulling codes is not an option. Even though my fuel lines were marked maybe I marked them wrong way back when I disconnected them. I was thinking about this, almost like it gets a shot of fuel in the wrong directions, but just enough to fire and then dies. Is this what would happen if they were reversed? I knwo there is a diagram somewhere showing which line is for what and I'll search for it but if someone has it hand could you post it?

Throttle does not keep it alive, I've thought of that too. I was leaning towards ignition because of how clean the cut seems, but I guess it could be fuel. But the thing is when I pull the plugs they are wet with fuel, like the ignition was what ceased and not the fuel.

I've taken a break, time didn't catch up to me until I stopped to get a bite to eat, then i just hit the wall. I was just so close to getting it done i didn't want to stop. I'll be double checking everything after the holidays, if I can keep myself away from it Christmas day ( I better or my GF may get a little upset )

BoOsTin FD

I had the similar problem. I had just put the fresh rebuilt engine in.... and what mine did was it started up, then it idled a little and died. And it kept doing that. So the first thing i did was i put a little atf in the plug holes... That made it start right up and idle at around 2k or so.

After it burned out all the atf it kept doing the same thing. 10 min later i got a smoke from Ignition coils and one of them caught fire. My problem was that the ignition harnes was busted and it touched a ground and 2 coils weren't firing at all.

I guess what i'm saying is check your coils and make sure they are connected right and that you have grounds on them.

4CN Air

iTrader: (7)

My friend said he saw a bit of smoke from the coil area, but I thought he had just seen some from the slightly exhaust leak around my v-band clamp. I've checked spark on each coil and they all fire properly. the ground line coming from the coil harness is connected.

BoOsTin FD

Mine was connected too, and i saw smoke too but i thought that maybe it's just burning crap off. The thing was they all worked fine up till the end... but the problem was that it was cutting up the power going to them so they were not firing the right way.

I don't know just make sure you got it all connected right etc. I'd definetelly look in the coil area.

dubulup

that gnd was eliminated in later models

4CN Air

iTrader: (7)

Yeah, i had an MSD hooked up, at first I thought maybe it was that, so I hooked it up like stock. I'll check into it soon. Time to relax with some Law and Order to forget about cars for a while.

Keep the ideas coming though guys, I'll be sue to give them all attention.

dgeesaman

iTrader: (7)

Did you hook up the fuel pressure gauge while starting the engine? I was able to get mine installed in-line and positioned so I could see the gauge from the driver's seat.

If your fuel pump is dying or the lines are crossed this will surely confirm that.

Dave

4CN Air

iTrader: (7)

I get fuel pressure, I had a friend watch for me. I'll have him crank it and I'll record the behavior of the pressure.

4CN Air

iTrader: (7)

ok I get 20psi of fuel pressure while cranking, around 45 once it's fired up. I get spark from all 2 coils. It seems to be a spark issue since their is fuel left unburned (one the plugs). It's also not just flooded, the car fires right up each time, but dies a couple seconds after starting.

Is there something else that could be affecting the ignition and causing it to cease?

I'm really lost here, the car fires up, runs smooth for a second or two, then dies. Like clockwork.

Oh, also I checked the fuel lines, they are correct, as I've said I don't think it's a fuel issue. The 45psi of pressure doesn't drop until after the car dies.

ANY IDEAS?

mad_7tist

sure the pfc settings are correct injector size option setting etc..

4CN Air

iTrader: (7)

??? injectors sizes are fine, haven't changed. I've gone from non-seq to single so the options should be the same right? Also how can i access this with a commander if the vehicle doesn't start? All I get is the Apexi start screen. Of course I've never used a commander is there soemthign i need to do here?

4CN Air

iTrader: (7)

someone please help, I'm so close to completing this project, it's so irritating

4CN Air

iTrader: (7)

update: commander won't display anything, and the exhaust overheat light is on. What error could cause the commander to not display anything (well it turns on and displays the Apexi logo, that's it). The logo just stays on.

Mahjik

iTrader: (1)

Was the PFC on the car before this project, or is it new?

4CN Air

iTrader: (7)

it's been on the car. Also I searched the problem and found another person whose display stuck on the apexi screen, he had a broken wire in the commander. I checked this and mine is fine.

Mahjik

iTrader: (1)

It's been on the car and running? The reason I ask is that is one of the symtoms for having the wrong PFC for the car.

4CN Air

iTrader: (7)

yeah, I've owned the car for a year, that PFC was running the car. The commander is new, but they aren't specific are they?

What other things would prevent it from showing? And light the exh. temp light? I've relocated relays, deleted relays, and cut off a lot of emissions etc. I've removed a lot from the stock engine harness, but these are things that weren't being used. I mean i guess it's possible that I messed up a wire, but I'd liek to access the Commander so I can see WHAT exactly is causing the light to come one so that i have some place to start.

Also I'm not running an 02 sensor but RX7Store says they tune for not having one, so this shouldn't light the light.

Any ideas? I'm running out to the garage and trying them as you guys suggest them.

Mahjik

iTrader: (1)

I don't have a PFC, so I'm not much help. From what I understand, the exhaust temp light being on when the ignition is on AC is normal. As it should go off once the car starts. However, getting the car started is your problem right now.

You probably should make a post in the PFC forum. Chuck has been visiting quite a bit and will most likely be your best shot for getting PFC info.