Sidestick

iTrader: (1)

I have a PFC I installed with an XS single turbo conversion. Problem is the car's running so rich that the plugs eventually get fouled after a short time & floods the engine. I have tried adjusting the maps at idle & below 0psi of boost. Right now the cells around the idle area are down to .60 (that's where it starts running rough as I reduce the fuel) & I have also brought down the PIM setting at 1000 rpm to 50% which is as far down as it goes. As for the car itself, all emissions stuff & solenoids are gone except the FPR solenoid, no cats, the O2 control in the PFC is disabled, still running the stock FPR till I get this sorted out (I had a SX FPR on it but removed it as part of the diagnosis), injectors are 550/1300RCs, RP Nippondenso fuel pump, primary injector lag set to 0.12. I hope I remembered everything. PFC was originally mapped by RX7 Store. BTW, I should mention that while the engine is running, there's no hint of any problem, except puffs of BLACK smoke at a blip of the throttle as I saw when I was getting the wheels aligned recently & the guy was putting the car on the ramp.

Yes, I did search with no conclusive answer found.

cewrx7r1

iTrader: (2)

Why is your 550/primary injectors lag set at .12ms? If so that is your problem.
It should be 0.

The secondary lag should be .12ms.

It is evident that your PFC is not set up to match your fuel system!

You also need to check out your fuel pressure at idle, 0 boost, and at boost to see if fuel pressure is tracking correctly.

Sidestick

iTrader: (1)

Thanks for the reply Chuck. The primary inj lag is actually set at -0.12ms, that was a typo. It was set at 0ms all this time but I changed it to -0.12 after searching and finding a thread you actually started on primary injectors lag testing. Some posters were finding that value in their PFCs that some tuner had input to their units (XS, I think). I'll check my secondary lag tomorrow.

Forgive my ignorance, but what should I be looking for at idle, 0 boost & boost as far as fuel pressure is concerned?

What kind of guidance can you give me to set up the PFC for my fuel system?

Thanks, Chris.

cewrx7r1

iTrader: (2)

That -.12ms lag should have dried up those small primaries, especially read my last 2 paragraphs.

By the Mazda book, and mine with a bigger rewired pump:
IDLE = 28-32psi, mine = 32
0 BOOST = 36-38psi, mine = 42
BOOST = (0 BOOST pressure) + (turbo boost), mine is the same.

A friend had the same problem as you. Car ran sort of OK but rich and the idle was very rich that could not be adjusted. We check everthing that you would normally, all we found was idle pressure of 38psi. He decide to upgrade his fuel system including an XS regulator. In the process he found the problem!

When he installed his 1200cc secondaries, he did not properly lube the "O" rings.
The #2 secondary injector bottom "O" ring split when it was inserted, and was constantly dumping fuel pass the split. That is why we could not control the fuel.

If all else fails, you may have a fuel leak past an injector bottom "O" ring.
Another thing, if a car idles good when cold, but then very rich when hot, maybe the water temp sensor and fuel temp sensor connectors have been swaped. This can also be seen on the commander for their voltage from cold to hot. Water temp changes a lot, fuel temp doesn't. Both sensors are the same except for what seal they use, and both connectors are the same green without almost identical length wiring.

Sidestick

iTrader: (1)

Thanks chuck, I'll check those things out & post my findings. Once again, thanks for the quick reply, you should be getting paid!

Chris.

TheWoganSleeve

Im having the same problem here. just fitted new fuel sys and single tub, my pfc is showing .2 bar even with the engine off. i need to drive 40k tomorrow on this engine to get it mapped but. i dont want to wreck it in doing so. what can i do to get it running better up to 2500 rpm (which is what ill be doing) max

Wankel1der

iTrader: (3)

i am having the same problems but i have no PFC, at idle when it did run tons of black smoke and running incredibly rich, i took midpipe off to check and see if it was clogged bc i also had little to no boost pressure. then i took out the spark plugs and the leading plugs are really black and drenched in gas!! without the midpipe on lots of white smoke and still no start! please help...my mods are all reliability! thanks guys