FC3S Murray

iTrader: (7)

OK, Wired the pump via HAILERS schematic and 1300cc.com write up. Everything is wired correctly(looked over it a million times). Factory fuel relay works(heard click) and resistor/ relay resistance all check good.

Voltage at idle is 12.5 v?
-to check to see in fact my factory relay was working i did the trick of loosening the electrical prong with a jewlers srewdriver and sliding it in and out when car was running. ----relay works 11 volts with red/green wire pullout/ 12.5 volts with in. I don't know why the voltage only drops down to only 11?

BEST yet when I give it full throttle when driving I get slight hesitations all the way to redline. My wideband is reading 10 AFR and does not budge when the hesitations occur. Feels like an ignition problem but the car was working FINE before the rewire.

-Grounds are all good, continuity checked all.
-spark plugs all good(thought maybe a fouled plug inconvinently reared its ugly head)

I am very frustrated with this project. I don't know where else to look and frankly am losing my patience.

I can not hear the radio shack relay click but obviously it is working or the pump/relay/resistor wouldnt get power ( i would test is but have a shitty multimeter right now).

just wanted to see if anyone has had this problem or anyone has some tips.

HAILERS

I'm not thinking very well right now, but, that seems backwards. You should see 9-11vdc at idle and 12plus volts at full trot.

I'll double check, but I thought the green/red wire put a gnd on the relay/resistor to make the voltage be LOW and when you romp on the pedal and get in boost the gnd signal on that wire goes away and then you get full 12vdc plus voltage.

Seems something there is wired just off a place or so. By the way, that was NZCONVERTIBLE's wiring diagram, I think.

I'll think about this a bit more. Maybe someone else who's thinking clearly will pipe in.

NZConvertible

That's my schematic. I know it's right because I made it to guide me when I did this, and it was the only info I used at the time. I followed what I'd drawn and it worked perfectly first time.

If you have 12.5V at the fuel pump while idling then something is not wired correctly. I dunno what else to say except check it again.

Is this why you asked about bypassing the resistor/relay? Don't hack it, fix it. At the very least put it back as per stock.

FC3S Murray

iTrader: (7)

BEFORE I wired the pump hot I rewired everything back to stock and tested the relay at idle. 11.2 volts, while driving 11v and WOT w/ headlights 10.8 v.

My AFR was going lean again near top end(13.5).

Pump hot now ARF is 10 at WOT.

Hesiations still present but I am checking out my ignition system tommorrow.

RETed

Why do you think you need to run it at 10???

I think you're running way too rich...

What kinda turbo?
How much boost?
What kind of gas are you running?

I think you need to back down on the fuel a bit...
I bet it'll run really nice running at around 11.0?


-Ted

FC3S Murray

iTrader: (7)

No intention of running that rich of AFR. 11 is what I usually aim for. I am doing some limited tuning with my GCC but haven't tried to yet because of the hesitations.

-Turbonetics TO4B H Trim hybrid
-Want to push 14psi BUT have been adjusting boost from 10 to low as 7 just to see if problem is boost related.
-91 Octane.

Anyway I think I found the problem. I went through the entire ignition testing procedures vis FSM for leading/trailing coils, plugs, wires. Also checked my Twinfire.

Resistance and voltage on coils were outstanding. Got to my plugs to test the resistance and my rear housing trailing plug connection to plug was snapped. Ended up pulling the boot of and found the shear about 2 inches from the where it connects to the plug.

I ordered some new wires last week(nice timing ) SO hopefully this is my hesistaion problem. I think it is because the hesitation isn't violent but just a soft, on and off lack of power. I know what bad TPS, bad ground and fuel cut feels like and this resembles nothing like those.

RETed

Hmmm...might not exactly be the problem, but it's nice to know that you did find something.
You're not running that much boost, so you are running way too rich.
Check the spark plugs?
If they are BLACK, it's too much fuel.


-Ted