TwinTurbo93

As some of you might know my project I been working on, so it came to an end, but I'm having some kind of fuel problems. Never ends, does it?

The car runs but realy bad, as in some kind of limp mode, and sounds realy weird.
Little clouds of blue smoke, gasie smelling, (it's not oil nor coolant) , looks like to much fuel is being sprayed in, only way it'll idle is over 1.5K RPM otherwise it will stall.

How do I know it's getting to much fuel:
When I shut down the motor, few drops of fuel come out from the a'pexi wastegate port, since there was a little exhaust leak I got under the car and noticed the drops of fuel.

Here's a little rundown what I did on the car and what to try addressing the issue I'm having.

Stuff done:
New walbro fuel pump (correctly installed 4 sure) and filter.
Injectors sent to RC for clean up.
Full tune-up inlcuding one coil.

Things I tryed to address the issue:
Pulled the primary inj's out and replaced them w/other good used ones.
Check the OHM ressistance on all inj.'s, (they're just as specified by mazda, good)
Replaced FPR w/new.
Fuel pressure adjusted to 38 psi, That's the lowest my FPR allows to.
Tryed reversing the FPR lines just in case I installed them the other way around.
Reset the ECU (PFC) by removing the neg. batt. terminal.
I took the spark plugs out to see if they were wet and full of fuel but they were OK, clean.


AND it still does the same...
I give up, I'm out of amo...

BTW are the secondary injectors sprayng when the motor is on idle? Or they just come online on higher RPM?

What the hell m'I missing here guys... HELP please
Sorry for the long post!

Stanello

iTrader: (1)

One of the secondaries could be leaking.

usma_2006

iTrader: (3)

to answer your question, the secondaries only come on under higher RPM's, but it could be possible the secondaries are leaking.

Also, the PFC doesn't reset by disconnecting the battery. If you want to reset the ECU, go to the etc screen, down to the initialize, choose yes, hit next, and turn the ignition off and then back to on.

Also, the mazda spec for fuel pressure at idle is 28-32 psi. If your FPR doesn't let you go any lower, you may be able to reduce the injector duty cycles on the fuel map in your idle range.

ROTARYROCKET7

how much does it cost to get ure fuel injectors mapped and cleaned out for a FC?

Sacker90

don't hack his thread....check the 2nd gen forum

TwinTurbo93

Thank you'all for replying, I will check all of the above and see if I can get it run good.


usma_2006
You are absolutely correct with fuel pressure PSI, but my FPR is not letting me go lower.
Would you be able to give me little a write-up how to reduce inj. duty for idle.? I'd highly appreciate that. When it comes to PFC I'm still pretty new to it and didn't do much homework on it.
Before I cleaned the inj., installed new fuel pump and filter I had no issues running 38-40psi




Any other thoughts and what should I look into, also higly appreciated.
Thanks.

quicksilver_rx7

John, this may or may not be the problem, but it could be the Fuel Pulsation Damper. Don't know if you've checked this.

TwinTurbo93

Thanks, that will be the next thing.
I guess FPD might give some trouble too, but as far as I know FPD might just give you little ruff idle if gone bad, and that;s about it, I may be wrong, but I will try swapping that to if everything else is doesn't fix my problem, that is the reason why I'm leaving it for last.

usma_2006

iTrader: (3)

[QUOTE=TwinTurbo93]
Would you be able to give me little a write-up how to reduce inj. duty for idle.? I'd highly appreciate that. When it comes to PFC I'm still pretty new to it and didn't do much homework on it.
QUOTE]

Sorry, I'd like to help, but I'm still learning myself and I don't want to give you bad or incorrect info until I'm sure I know what I'm talking about. I had some idling and startup issues this past weekend after just installing new plugs. It took a complete recalibration of my idle bleed, idle air, and a PFC initialization and tweaking to get my idle to hold steady again...

I bet someone in the PFC forum would be able to help you lean out your idle points.

maxcooper

Since you just replaced the injectors, perhaps one of the o-rings was cut or pinched, leaking fuel into the engine. Keep the lines attached and remove the rails from the block/manifold. Run the fuel pump by connecting two wires in the service connector, and see if any fuel shoots out when the pump is running? An easier test to see if you have a leak somewhere would be to watch to see if the fuel pressure drops faster than expected. Ask other folks with Walbro pump too see what is normal.

-Max

TwinTurbo93

usma_2006
It's cool man, thanks anyway, I appreciate your help and honesty.


Max
That's a very smart idea, I will try that!
Yes the fuel pressure drops fast, and when I removed the fuel hoses take out the primarys, there was no pressure in the lines at all.

mad_7tist

when you adjusted the regulator you did it with the vac line off right? i would suspect a leaky injector like max said maybe. some of those fpr leak down pretty fast. to check the injectors for leaks pressurize the lines and pinch the feed and return and see if it drops

TwinTurbo93

No, I didn't adjust the FPR with the vac. line of, I left it connected while adjusting.
Isn't that the way it should be done? It seem to be adjusting fine with it on.

I have a feeling an injector is leaking so picked up a set of primarys to swap and check them, so since the secondarys don't come online till higher RPM I didn't think of checking them .
Yet to find out though, will se tomorow.

Thanks for helping out ya'll.

lopedl

iTrader: (1)

yeah the secondaries will still be pressurized and could still leak even though they don't come online until a later cycle.

What do you mean the car sounds wierd?

Railgun

I think I know the sound he's talking about. It's almost sounds like it's under a load while idling, and perhaps that it's only running on one rotor. Have you checked your plugs to see if they've fouled out? I've heard this on two motors. I wish I could explain the sound better, but it's like the motor has a frog in its throat. If you heard it you might know what I mean. If the other guythat's local here is still having his issue I'll see if I can get a sound clip.

TwinTurbo93

I was confused about the fact that the sec. inj.'s are still under pressure and didn't think about it at all.
As Railgun69 described, xactly that is how it sounds, like running on one rotor.
After few attempts I removed the plugs to see they'r condition, they were perfectly clean...While the motor was pretty hot from trying to make it run good, I did a compression test and showed exelent results, 115 + - on both rotors.

Anyhow, still to find out today, gona do the secondary inj. and pressure tests, wish me luck .

TwinTurbo93

After shaking my head last night a little, and energizing my brain back to it's normal functionality, it made alot sense what mad_7tist said, that adjusting the FPR with the vac . hose of is the correct way of doing it.

To check the Fuel Pressure as the factory shop manual shows, needs to be done with the car of, which is the same as with the vac line of if the motor is running....

I guess that answers my question why I didn't seem to be able to adjust the FP lower than 38 psi.

TwinTurbo93

I'm so happy, my baby is back to life again,.


Thanks to you guys, I love you'all, I love this forum, I'm going to donate some money again, right now. , the best thing ever happen to us is this forum.


Just as many of you suspected/knew, yes it was the secondary #2 injector leaking on the side, just like Max said, I pinched the damn rubber O ring when I installed the inj, I forgot to lube it w/some oil before installing it, so the inj. didn't fully sit in all the way, so it leaked on the side of it from the fuel rail where the O ring got pinched, SOB got me so mad.

Well she's back and screaming like a bithc.... I'm so happy...
Thanks a million ya'll.

Rotarytard

Congrats. Sorry to hi-jack your thread but since your problem was solved and I was having the same problems except it would flood my car every time I try to start it.

I have swapped out the primaries and it ran fine for 1 day.
Today I tried starting it again and it would start for a few seconds and die, but doesn't flood. It would idle if I keep revs up high but the idle would stumble and sometimes it'll end up dying.
Checked the pfc and it was giving -700 to -600 hg when the car was off. Possibly the map sensor or is it the secondary injectors?

TwinTurbo93

Maxcooper pointed out a good way how to check if your injectors are leaking or dripping.

By pulling the rail of, while still not disconecting the fuel lines, put the ignition on and on the diagnosis box, ground + f/p, that will pressurize the fuel system and if either of the prim. inj.'s leak you'll se it spray, do the same to the sec. inj.'s.

That's how my mystery was revealed today.
Good luck.

RX7UP

Haha, John..... Great!!!.... The Beast is alive again and breathing fire like a donjon dragon... WHRAAAA, WHRAAAA!

iCongratulations!

Now to dyno tune.....