Running Rich on a 91 T2 (No power at all)
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Running Rich on a 91 T2 (No power at all)
I seem to be running rich since I am shootin flames out of my exhaust. It seems to drive ok at light throttle, but if i give it some throttle and enter boost, it just lags big time. Compression is good. Changed out the Pulsation Dampener and Fuel Regulator which fixed the hard starting when hot. Fuel pump is good. Injectors are within resistance specs. TPS is within specs. No Malfunction Codes. My mods are listed below except I took out the 720cc injectors and now have 4x550cc injectors. I haven't gotten any good responses in my posts lately, so hopefully someone can help me out. I'm gettin real sick and tired of this car and feel like parting it out. Its been one thing after another from mechanical to electrical problems. But this problem I just can't quite figure out. Someone help me out before I do something stupid like part this b*tch out.
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What do you mean it could be from just running rich. I think I am running rich as I am shooting flames out of my exhaust liek I mentioned. And what does wastegates on the stock turbos have to do with running rich? If your talking about boost creep, it never went past 8psi when it was running right.
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How is the wastegate dangerous? Its an S5 Turbo. So it has the better wastegate. The wastegate can't be contributing to my loss of power, because I only get 8psi boost.
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Sorry, im not clear. I wasnt saying your wastegtate being the source of the problem. I would just watch out with those stock wastegates, s4 especially of course. If you keeping it low boost, then you should be fine.
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yes. i've checked everything out. nothing is blown or loose. Remember That I am shooting flames which indicates me running rich, and I have never shot flames before, and now its doing it constantly and I have a huge lost of power under boost which would mean more fuel. Correct me if I'm wrong, you can only shoot flames if it is running rich, right?
#11
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Right! And you can be pig rich if you have an intake leak between the turbo and intake ports. Air is compressed in the intake, air leaks out coupler, calculated fuel still makes it into the motor, but not all the air. So your final result it more fuel than expected.
Is it possible that a hose came loose? How about the oil injection vacuum spider? Also, maybe you have an intake gasket that leaks? It is possible for the couplers to leak under pressure, but not under vacuum.
Is it possible that a hose came loose? How about the oil injection vacuum spider? Also, maybe you have an intake gasket that leaks? It is possible for the couplers to leak under pressure, but not under vacuum.
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Right! And you can be pig rich if you have an intake leak between the turbo and intake ports. Air is compressed in the intake, air leaks out coupler, calculated fuel still makes it into the motor, but not all the air. So your final result it more fuel than expected.
Is it possible that a hose came loose? How about the oil injection vacuum spider? Also, maybe you have an intake gasket that leaks? It is possible for the couplers to leak under pressure, but not under vacuum.
Is it possible that a hose came loose? How about the oil injection vacuum spider? Also, maybe you have an intake gasket that leaks? It is possible for the couplers to leak under pressure, but not under vacuum.
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What is the condition of your plugs and wires?
Checked all injectors for leaks?
Do you have any way to read A/F ratio? Can you confirm that the car goes pig rich when you are under boost?
Tested the pressure sensor lately? If you have an FCD, try running the car at low boost without it. They can fail...
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What does this have to do with the problem? It's totally irrevelant to this issue and in this thread just confuses the matter...
Have you tuned the F-Con?
What is the condition of your plugs and wires?
Checked all injectors for leaks?
Do you have any way to read A/F ratio? Can you confirm that the car goes pig rich when you are under boost?
Tested the pressure sensor lately? If you have an FCD, try running the car at low boost without it. They can fail...
Have you tuned the F-Con?
What is the condition of your plugs and wires?
Checked all injectors for leaks?
Do you have any way to read A/F ratio? Can you confirm that the car goes pig rich when you are under boost?
Tested the pressure sensor lately? If you have an FCD, try running the car at low boost without it. They can fail...
#15
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did this come about slowly or did it just happen one day? did this happen after you played with your FCON? or after you changed your fuel components?
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"did this come about slowly or did it just happen one day? did this happen after you played with your FCON? or after you changed your fuel components?"
This just happened one day. It was driving good in the morning and I even punched it in 2nd gear and it was pulling really hard and smooth. I drove normal the rest of the way on the freeway and giving it some boost to like 4-5psi when I got to the streets then to my auto class. when I got out, I was driving normally to work and then from one of the stoplights, I take off normally and noticed when I got into boost it lacked power big time. Ever since then, it hasnt been the same. I've tried so much **** Fuel related, but can't figure it out.
Today, I changed the spark plugs(which had some carbon deposits which means unburnt fuel), and put the stock spark wires back on. With the stock spark wires, it would fire up but not idle at all. I threw the Racing Beat 8MM wires back on and it was idling back to normal. Now my question is, can bad coil packs cause flames in the exhaust from a misfire or backfire? I'm gonna check out the coils tommorow, but I was thinking, wouldn't the ECU detect a malfuntioning coil? I'm starting to think maybe I am not running rich, but Im not getting enough spark. Or maybe bad timing? Tell me what you guys think.
This just happened one day. It was driving good in the morning and I even punched it in 2nd gear and it was pulling really hard and smooth. I drove normal the rest of the way on the freeway and giving it some boost to like 4-5psi when I got to the streets then to my auto class. when I got out, I was driving normally to work and then from one of the stoplights, I take off normally and noticed when I got into boost it lacked power big time. Ever since then, it hasnt been the same. I've tried so much **** Fuel related, but can't figure it out.
Today, I changed the spark plugs(which had some carbon deposits which means unburnt fuel), and put the stock spark wires back on. With the stock spark wires, it would fire up but not idle at all. I threw the Racing Beat 8MM wires back on and it was idling back to normal. Now my question is, can bad coil packs cause flames in the exhaust from a misfire or backfire? I'm gonna check out the coils tommorow, but I was thinking, wouldn't the ECU detect a malfuntioning coil? I'm starting to think maybe I am not running rich, but Im not getting enough spark. Or maybe bad timing? Tell me what you guys think.
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I would check your pressure sensor and coils, and definitely make sure you've got your timing set correctly. There's not really much it could be, so at least you know that you'll eventually figure the problem out...
Also, it's important that you replace your fuel-injector o-rings and grommets. If there's even just a little crack in one of the seals, it can cause major issues (popping, loss of power, poor idle)--after replacing those, make sure that you install the injectors very carefully so that you create a good seal. If you pinch the o-ring even just a little bit, it can cause problems.
Also, it's important that you replace your fuel-injector o-rings and grommets. If there's even just a little crack in one of the seals, it can cause major issues (popping, loss of power, poor idle)--after replacing those, make sure that you install the injectors very carefully so that you create a good seal. If you pinch the o-ring even just a little bit, it can cause problems.
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just a suggestion, even though you might not be getting the Check Engine light come on there might still be an intermittent error or an output device error which will not show up as a CEL.
to see these you must leave the test connector jumper connected while you drive, and see if you get any flashing error codes. try that and see if you get anything.
to see these you must leave the test connector jumper connected while you drive, and see if you get any flashing error codes. try that and see if you get anything.
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I would check your pressure sensor and coils, and definitely make sure you've got your timing set correctly. There's not really much it could be, so at least you know that you'll eventually figure the problem out...
Also, it's important that you replace your fuel-injector o-rings and grommets. If there's even just a little crack in one of the seals, it can cause major issues (popping, loss of power, poor idle)--after replacing those, make sure that you install the injectors very carefully so that you create a good seal. If you pinch the o-ring even just a little bit, it can cause problems.
Also, it's important that you replace your fuel-injector o-rings and grommets. If there's even just a little crack in one of the seals, it can cause major issues (popping, loss of power, poor idle)--after replacing those, make sure that you install the injectors very carefully so that you create a good seal. If you pinch the o-ring even just a little bit, it can cause problems.
just a suggestion, even though you might not be getting the Check Engine light come on there might still be an intermittent error or an output device error which will not show up as a CEL.
to see these you must leave the test connector jumper connected while you drive, and see if you get any flashing error codes. try that and see if you get anything.
to see these you must leave the test connector jumper connected while you drive, and see if you get any flashing error codes. try that and see if you get anything.
#20
last time my car started shooting flames my TPS was bad. however, this doesnt sound like your problem, the ignition thing would be a good place to start but its wierd that it happened while you were driving. did you check to make sure the coils are indeed firing? getting sparks to the plugs? if the trailing coils arent firing sounds like it would cause your rich problem.
best thing to do is just give up and sell me the car. :-)
g/l let us know more when you check more into it.
best thing to do is just give up and sell me the car. :-)
g/l let us know more when you check more into it.
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also if the problem is intermittent the ECU might not record it, there is an amount of time that the error needs to be detected for in order to be recorded.
Aaron
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last time my car started shooting flames my TPS was bad. however, this doesnt sound like your problem, the ignition thing would be a good place to start but its wierd that it happened while you were driving. did you check to make sure the coils are indeed firing? getting sparks to the plugs? if the trailing coils arent firing sounds like it would cause your rich problem.
best thing to do is just give up and sell me the car. :-)
g/l let us know more when you check more into it.
best thing to do is just give up and sell me the car. :-)
g/l let us know more when you check more into it.
Anyways, I was right after all about checking the ignition system. Damn, I fucked up by not going with the basics. I just kept thinking Fuel, because of flooding and flames. Leading Coil went out. Put in one of my 3 spares, and it pulls just as good as ever, if not better. I'm pretty happy that I solved this **** myself. This car is a pain in the ***. Ever since I got it running 3 months ago, I have been troubleshooting electrical and mechanical malfunctions. From Engine swaps to short circuits and etc., I have done a lot more work on the Rx-7s this year than the past 4 years of my experience with Rotary engines and Rx-7s. I should be ASE Certified and graduated by the end of 2008 and plan to be a rotary mechanic one day with my own shop, so I'm glad I didn't quit. And about parting the car out, that was just my ego crushed from frustation and anger because I only got 1 hour every 2-3 days to work on my car. And all these people trying to put me down saying I shouldn't be messing with rotaries even though I been troubleshooting local rx-7s for a while now. I still feel like a rookie, but I've gone a long way since 4 years ago. Well, now my confidence is building back up. I've been to busy and stressed out as of late, but I'm glad I made it through. This car truly represents my determination of becoming a mechanic. I'm tackling something that the majority of mechanics are afraid to touch. Even though most of the posts didn't help, thanks to everyone for the help.
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