DVSseven

If you are not already familiar with my "SAGA" then read my previous threads because it is quite in depth. So as alot of you know I have been troubleshooting my FD for over a year now with no luck as of yet. My mods are as listed: Pineapple Racing built motor, new housings, rotors, lightly ported, stage 2 oil mods to the motor and pan, and all components are cryo treated. The turbo's are new 99 efini turbos installed with the new motor. Along with the new turbos and motor I have an m2 ecu, m2 downpipe, 20b fuel pump, new oil injectors and lines, RPS carbon-carbon cluthch, ACT 9.5 lb. flywheel, injectors rebuilt flowed and matched by Marren fuel injection, Pettit intake setup with polished hard piping and UIM, Magnecore 10mm. wires, NGK b8es and b9es plugs, C's short shifter, Random technologies cat, Greddy power extreme exhaust, Greddy timer, Greddy BOV, Pettit battery relocation, Pettit AST, silicone vacumm hose replacement, Fluidyne radiator, A/C eliminated, airpump eliminated, and probably some more but you get the idea.

So I had the car at Pettit for 7 days to try and sort the car out cuz I have been pounding my head on this thing for a year now since I put the new motor in last summer. My symptoms are: comes out of the hole strong through 1st and 2nd, but falls on its face in 3rd and so on, but pulls strong after transition. So, I figured its gotta be either fuel or ignition, right? So I have tested or replaced the following: replaced Air inatke temp. sensor, coolant sensors, tested TPS, igniter, starter, Map sensor, crank position sensors, replaced the wiring harness with a new harness, replaced plugs and wires several times with different gaps, replaced all of the ignition coil packs with new components, replaced turbo precontrol, wastegate control, and turbo control solenoids with new, replaced all one way check valves with new, redone the vacumm hose setup for reassurance, and I have ran about every test and scenario I can imagine or find.


So, we got the car on the dyno at Pettit and strapped the car down ready to squeeze her a few times. We ran a few passes and found that the car starts to build good power but when you get into 3rd gear and squeeze down throttle it dumps fuel and just falls on its face. Great, now I know what the problem is, I leave the car with Cam and tell him to do whatever it takes or costs to fix the car. After having it from that Monday till when I picked it up on Saturday he ran all the tests he could and could not find the culprit of the problem. He installed a Wolf 3d computer to watch all the sensors and so forth but they are all reading normal. He took out the injectors and benched them, he said that they appeared normal. He measured the fuel volume and capacity while at idle and while on the dyno and said that it was perfect. They inspected the fuel rail, injectors, and FPR, everything checked out. Down in south florida, 10 hour drive, no a/c, thousands of dollars cash in hand ready to pay whatever it takes to fix the car at the "best rotary specialist in the nation" and couldnt get it done. We were able to back the fuel off with the Wolf 3d computer to see how the car should run and man was it fast, and laid down almost 330 whp at 11.5 lbs of boost, not too shabby. But thats just a band-aid for the problem not the correct fix. So he says that hes stumped and recommends replacing the harness when I got back home. So i go back home order a harness while at work,(mazda service advisor), I install it and there is no difference. This weekend I put a PFC on the car to monitor the sensors and injector duties and everything was within spec. But, im wondering if I have a secondary injector problem??? Sorry sooo long but im fixing to sell if i cannot fix, sounds sorry I know but im literally really getting sick, trying to get this POS to perform correctly. I have over 30,000 grand invested and cannot enjoy it, VERY FRUSTRATED!!! Thanks anyone.......

RotaryResurrection

iTrader: (8)

I dont see anything listed for ignition upgrade...still running stock coils? Tried another set? Tried something aftermarket? A weak ignition can act like a rich condition under certain circumstances.

I can't believe pettit couldnt figure it out.

DVSseven

I actually have brand new coils right now and had in the past a Jacobs rotary pro-pak setup that I eleminated in this troubleshooting process....

DVSseven

I now also am getting a weird fluctuation and whistling noise while in transition....

brancato1

Well... if the Wolf ECU fixed it, then I would replace the ECU.

The M2 isn't even mapped for your 99 spec turbos anyway, is it?

DigDug

Did you ever try swapping back in the stock fuel pump? I don't mean to run it permanently, but maybe just a couple runs through transition to see if it does the same thing.

You also tried replacing the FPR, right?

Otherwise, I'd try swapping in a set of stock secondaries.

DigDug

FWIW, he's already tried 3 different factory/remapped ECUs, plus the PFC.

Did the car still have the problem with the PFC installed?

Gamezilla

This might sound totaly off the wall, but try replacing the sensor on the tranny thats located on the passanger side right in front of the shifter. I know it recognizes when you're in 1st and 2nd but not any other gear. I think its for emissions, but as strange as it might seem, that might be your problem. I've seen weirder **** cause problems with these cars. I bet its not an expensive part and its the only thing I can think up that would completely **** everything up once you get into 3rd. Its worth a shot at least.

DVSseven

Yes Ive Tried The Stock Ecu, The M2 Ecu, Pfc, And The Wolf 3d. The Wolf 3d Only Fixed It Cuz We Pulled The Excess Fuel Out Of The Map. The Car Did The Same Thing With The Pfc Installed. I Wonder If The Tps Or Crank Sensors Could Be Testing Out To Spec And Still Be Faulty. Im Kinda Wiery On Replacing The Injectors Because The Problem Seems To Deal With The Rpm Range. Does Anyone Know What The Sensor It Is That Gamezilla Is Referring To?

Gamezilla

I tried looking it up and didnt find much info. I can take a picture of it if you like so you know exactly which one Im refering to (I have a transmission sitting in my living room).

DigDug

The 1-2 switch.

So now you're saying the problem only occurs in 3rd gear? I thought you said this always happened at transition...

If it happens with the PFC as well (and every other ECU you've tried), I'm strongly suspecting the fuel system.

DigDug

If it's happening at transition, it's not necessarily related to engine speed. If you changed the transition point and it still happened at transition, it would prove that it's specific to transition, and not engine speed.

DigDug

...

DVSseven

Digdug, It Comes Out Of The Hole Strong Through 1st And 2nd Gear Then I Hit Third And It Falls On Its Face, This Is When Its Dumping The Fuel. Then When I Hit Transition I Get A Plume Of Rich Smoke Behind Me And The Car Pulls Like Gangbusters....

DVSseven

I Know Its Probably Something Simple But Im Getting So Fed Up Im Willing To Sell It And Hop Into A New G35 Coupe And Ride On A Warranty With No Concerns. But Then What Would I Do To Make Myself Miserable!

DigDug

That's not quite how you previously described it (in the other thread). Nobody can help you troubleshoot your problem if you don't give them accurate information. Just as importantly, you need to be complete. The answer is often in the details.

So it's fine in 2nd all the way to redline, and then goes rich when you get it into 3rd and get back on the gas, and the engine bogs. Then at transition, it blows smoke and takes off. Is that correct?

Does it remain rich during the transition? And then pulls as soon as the transition is over? Or is it leaning back out as the transition begins? Once again, details...

DVSseven

Digdug, Sorry About The Confusion Previously. But It Is Just As You Described It, After Transition Down At Pettit On The Dyno The Fuel Seemed To Be Fine. It Seems To Be Only Just Before The Transition When At Tip In....

DigDug

Only in 3rd? Does it also happen in 4th and 5th?

apex_sideway

G35 is a nice car

DVSseven

Digdug, Yes It Also In 4th And 5th No Matter What Rpm. Usually Even 4th Gear In These Cars Is A Nice Pull, I Can Be In 4th And Throttle Down And The Boost Slams Up But The Car Does Not Pull.

DVSseven

Cam From Pettit Just Called Me About 30 Mins Ago And Cam Said He Was Still Gonna Try And Help Me Out. I Told Him How We Put The Pfc On It This Weekend And Saw Nothing Out Of The Ordinary, And That We Were Considering Replacing The Secondary Injectors As The Next Step, Even Though Cam Benched Them. He Replied With: "since You Replaced The Harness And Watched The System With The Pfc Afterwards And Saw No Change Or Anything Unordinary I Was Going To Recommend Replacing The Secondary Injectors As A Next Step As Well. " He Said That Even Though He Benched Them They Could Still Be Faulty.
The Very Cool Thing That He Did Do For Me Was He Said He Is Sending Out A Secondary Fuel Rail With Known Correctly Operating Injectors And Fpr For Me To Test With Before I Spend $800 On Injectors... Thats Really Awesome Of Him....

DigDug

That's very cool of Cam. Let us know what happens.

DVSseven

I Will Im Looking For The Package To Arrive Today Hopefully, And I Will Probably Install Them While Im Here At Work.

DVSseven

Is There No-one On Here Today....

DigDug

I'm here. No surprise there.