Alright. My FD has always had a boost issue where it only produces 5 psi on the first turbo and 0 psi on the second. so i installed a full 3" down pipe, mid pipe, and HKS 3" catback. after i installed that exhaust thinking maybe i had clogged exhaust in hopes of regaining boost again, my car was flooded. i had it towed to the dealer for a deflood. after they got it running (first time with new exhaust) during warm-up my downpipe gets RED HOT and my exhaust starts shooting and popping constant blue/red flames until you start driving it.

Now when my car gets up to 2.5K-3.8K RPMs it feels like it gets a fuel cut(hitting the wall) then i hear a loud POP and another flame will shoot out. i cant get my car to drive beyond 2.5-3.8k RPMS the dealer said they dont have anymore test equiptment for the FD.

I was wondering if maybe my injectors are not keeping up with anymore and my fuel cuts out? or maybe i had bad apex seals? it'll rev all the way in nutral. i just cant drive it over 3.8K...

before i take it for further testing i was wondering if maybe someone knows some cheap quick fixes that might work? new fuel filter? injector cleaner? bad ecu?

it seems like once it starts getting anything around 3-5 psi it just wants to shut down... it also has a hard time trying to idle at stops (automatic tranny) i need to pop it in nutral when i come to stops because it feels like dying... when its in park it also has a annoying bump idle.


any help would be appreciated.

 

Your coils could be bad or you could be having some other ignition or timing problem. Check to make sure your MAP sensor is still connected, and reset your ECU.

 

bump?

 

I guess you're completely ignoring my suggestions?

 

i'm with Rynberg... check the map sensor is plugged up behind the throttle body on the firewall... if that has popped, you ain't going anywhere fast, and you're running really rich.

thats my money... and rynberg answered pre-bump!

 

people keep missing this one,,,,but that sounds like your car is in limp mode have you tried pulling ECU codes (limp mode = no acceleration unless you squeeze the gas pedal only slightly,,, no boost,,,and large backfires and cut offs at 3000rpm)
maybe your correct about an injector problem causing rich conditions but just try pulling the ECU code first,,,, just my 2 pence

 

how to you reset the ecu? i tried key-on/key-off once and its the same... timing check on a fd? isnt it all controled by the ecu? how to a get codes if my check engine light isnt on? everything looks normal... my engine is all stock besides full 3" turbo back(no cats)

 

Disconnect neg battery cable, hold brake pedal down for 30 seconds. Done.

And you are going to blow your motor with that full exhaust...

 

how am i going to blow my motor with full exhaust? boost creep?

 

YUP!

 

Check ignition problems as well. You need spark in order to ignite fuel. It's either bad wires, bad ignition modules, bad plugs, or stuck open injector (likely).

 

Mine acted like you are describing soon after I had bought my car and my coils were dying and my MAP sensor had blown off.

 

I got that exhaust because my car didnt boost above 5-4 psi... so i figured (FD3S+TwinTurbo+stock exhaust+rotting muffler = clogged exhaust). so i installed the open exhaust hoping that'll solve my boost issues.

 

Is there any way for me to test these parts on my own? like the coils, MAP sensor, injectors?

Is it possible to have this type of problem if the idiots installed the leading plugs where the trailing plugs go? i do remember one of my plug wires was sorta hard to plug onto the sparkplug... i'll check that too.

would these symptoms appear if my motor has bad apex seals? could this be a sign of a dying rotary? it feels like it'll pull hard if i could just get the car above 2.5-3.8K RPMs

 

my money is on the MAP sensor still... how to check it?
look at it! it sits on the firewall directly behind the Throttle Body (on my JDM anyway)... there should be a hose going into the bottom of it... if not... it's popped off.

have you got the factory service manuals? get them.

 

just get a pfc and commander and you will be able to see where and what your problem is. it would be better to get on anyway.

 

Before dumping too much money into diagnosing your problem, buy a service manual and start checking the simple stuff like any hoses that are popped off or have cracks in them. Next thing would be to check the things like TPS, coils, etc.

You can get more information on how to test each system using the service manual.

Good luck!

 

Hey, i just wanted to say that i finally AFTER ALL THIS TIME!! got my RX-7 running right and finally boosting. this is the frist time ive had my FD boosting since ive owned it. My car is a world of difference now and i really appreciate your help!

My boosting problem was my clogged factory exhaust.... my RPM and cutting out problem was my ECU in "Safe-Mode". all i had to do was simply reset my ECU and all of the sudden my car was better than ever.

I have one question though.... Even with my car running right, it still shoots some fire and my turbos/downpipe still get red hot during warm-up and after driving it around... I have full 3" down pipe, midpipe, and cat back. my boost isnt creeping, i have a boost guage and its right at 10 where it should be... I removed my turbo'd heat shields when i installed my 3" downpipe because they wouldnt fit.

DOes anyone else have full 3" exhaust with redhot turbos/downpipe/fire shooting during warmup?

I have no other mods.

 

You are still having a problem. You should not have glowing red exhaust parts except under extremely hard boosting. I'm still guessing that there is some problem with your ignition.

 

File, there is only one thing which will cause excessively glowing exhaust parts: unburnt fuel burning in your exhaust. At this point you need to determine if it's ignition or something else. It's unlikely you're overly rich with your mods and a stock ECU, because of the ECUs maps. I still say you're just plain not burning all the fuel you put in.

Easy step 1:

Remove spark plugs and examine.

 

take it to someone who knows the car, and if u cant right now, try not to drive it around, ur gonna hurt it probably more then it is already hurt