UPDATE:

I moved knock sensor to rear housing, still same problem.

I disconnected the pfs ecu completely, ran on my stock ecu, and here is what's happening now.

If I get 9psi, everything is perfect, just like it used to be. If i get 10psi, as soon as i reach 10psi it's like a fuel cut or some kind of cut. A/f gauge goes to lean and I loose power.

I know it's not the ecu now because with ecu, i didn't have total fuel cut, it was just hesitation a lot.

Maybe it could be my injectors, but I don't see why would it run perfect at 9psi then.

Also, I can't raise the boost on profec to 10psi, i can't raise it to any setting, All i get is 9 and then when it hit's 10 it's bad.

Amel

anybody have any suggestions on what to check next?

Amel

I don't have the FSM with me here at work (or remember the values) but I would start first by checking and making sure you get getting the right fuel pressure.

After that, I would test the coils and make sure they are ok.

on the diagnostic box which ones do you short out to get the reading? and how much am i suppose to get?

Also, how do you test coils?

Amel

I'm sorry but I don't have my FSM right now (I'm at work) or I would direct you do the exact pages. Take a look in the FSM, the test procedures are listed in there (in the respective sections) as well as the tolerance values.

Ground and TEN.

I changed the Fuel Filter, Checked the FP pressure and everything by the manual. Everything turns ok with Fuel pressure.

It stopped happening at low rpm, it's only happening now at the transition and then at around 5-6k.

I guess my next step would be to replace turbos and see what's gonna happen then.

Anybody have a link or phone number for those guys where I send my injectors to get cleaned and balanced?
Also, how much is it per injector?

Amel

Sure: http://www.rceng.com/

I think it's about $26 per injector. Most people have have new o-rings returned back with the injectors. You might also look at replacing a few other items:

https://www.rx7club.com/showthread.p...hreadid=232603

Thanks Mahjik.

Hey boostinfd did your problem get solved.. I am having the same problem..

Was on the twins when it started happening in the first boost that i gave the car after a rebuild run-in...5-6 psi it was fine but if i floored it same hesitation.. so i changed my turbos and got a single turbo.. Had lots of problems with controling boost first but now everything is all set.. but still when i floor the car i get hesitation at around 5000rpms .. even if i run 9psi or 12psi.. whats strange is that it became ok a few days back and for two days it ran great... but then i replaced the midpipe and put a resonated midpipe in and the problem came back so i put the midpipe back in.. But the problem is still there...What could it be??

I'm still waiting to purchase a nice set of twins. Then i'll see if it's not the twins, i swear i'll sell that car.

Amel

I said the saqme when i did the second rebuilt.. and guess what.. have spent like another $5000 on the car after the rebuild and say to myself everyday that i'll sell the car ....

What's your FP under WOT reading? How old is your pump?

I never changed pump and the reading at idle is around 35 i think wot is around 40.. something.

see this

https://www.rx7club.com/showthread.p...l+and+pressure

I checked it out, but there isn't much he knows either. I got plenty of grounds, and they don't do squat on my fd.

Amel

plenty of gounds ? what do you mean by that ?

I mean i have 11 grounds on my engine, exhaust, etc. Doesn't make a difference.

There`s always a thin line between love and hate...don`t you hate it when you buy one of the most respected cars and when you drive it on the road and it doesn`t run right?

I`ve had the same problem...even with my mods being a supra tt pump, 9`s and 10`s cold plugs, pms, DP, cat back. I`ve notice while running 15 psi boost in the pri/sec turbo`s as i easy into the throttle it runs to 9,00o rpm`s with ease and no problems. but when i punch it, as it climbs to a higher rpm 6-6800 rpm there is a shutter like a lack of fuel...so i change the map sensor and wire in a 5 bar with a inline filter. The ones that comes in the profect-B and problem solve

different map sensor, doesn't make a difference with PMS unless you have a PFC, then yes.

Amel

Anyone else find out a cure for this ?

Tom

I haven't found it yet. :(

I have a 93 with a street port. Its always misfired over 45k when there is boost over 5psi. I found it was running too rich and the plugs would not be able to handle the A/F mixture. I have a map sensor fuel computer and set back the fuel curve 20 percent. runs great now.

I think my problem is fixed, after i replaced twins. I don't have that problem any more and i can boost 15psi till redline with no problems.

Amel

I also replaced a map sensor from my buddies 93 fd so that might have helped too.

Amel