10psi + boost... studdering and braking up
#26
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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
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
#30
Mr. Links
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Originally posted by BoOsTin FD
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
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
#31
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Originally posted by BoOsTin FD
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
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
#32
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Thread Starter
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
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
#33
Mr. Links
iTrader: (1)
Originally posted by BoOsTin FD
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
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
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
#35
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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??
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??
#37
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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 ....
#40
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#44
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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
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
#48
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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.