93 single turbo rx7 lumping idle/late throttle response
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93 single turbo rx7 lumping idle/late throttle response
Well i finally got my rx7 to start up. She sounds great at idle. 15 pounds of vacuum. 60 psi of fuel pressure and a healthy sounding idle.
Heres my issue. As soon as i try to give the car gas the accelerator is 1 delayed and 2 will not consistently give me throttle response. It will bounce up to only about 3k rpm and go back down to idle and will repeat this even with my foot on the accelerator. The car also runs at idle around a 11 afr. But when given gas, quickly leans out and continues its lumpy throttle response. Recently i have cleaned my throttle body. Took the tps off and put it back on without re tuning it. I have now re tuned my tps to meet the specifications yet it still has the throttle delay. I also changed out my coil packs not too long ago. Maybe a month or so. Other than that im not sure where to start with the delayed throttle. Clogged injectors? Bad spark? Ecu doesnt know how much intake and fuel is in the engine at the time? I need some advice on what to diagnose it down to.
Also was thinking of running a little bit of fuel injector cleaner to see if i could free the lines up a bit.
Heres my issue. As soon as i try to give the car gas the accelerator is 1 delayed and 2 will not consistently give me throttle response. It will bounce up to only about 3k rpm and go back down to idle and will repeat this even with my foot on the accelerator. The car also runs at idle around a 11 afr. But when given gas, quickly leans out and continues its lumpy throttle response. Recently i have cleaned my throttle body. Took the tps off and put it back on without re tuning it. I have now re tuned my tps to meet the specifications yet it still has the throttle delay. I also changed out my coil packs not too long ago. Maybe a month or so. Other than that im not sure where to start with the delayed throttle. Clogged injectors? Bad spark? Ecu doesnt know how much intake and fuel is in the engine at the time? I need some advice on what to diagnose it down to.
Also was thinking of running a little bit of fuel injector cleaner to see if i could free the lines up a bit.
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Won't adjusting my idle air just change the idle and thats it? Yes the car has a pretty rich conservative map. Hasnt ever done this since i cleaned my throttle body and put my new air filter on.
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so single turbo conversion. 550cc primary and 1680cc bosch injectors. Walboro 255 fp. Kg speed rails. Larger streetport. Custom exhaust manifold. Front mount. Running off of a power fc unit. Profec b boost controller. Wide band. Emmisions delete. Just throwing out some quick stuff.
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Not trying to be harsh but the first think I would do is throw those injectors in the garbage. They are 1970s technology. They have a poor spray pattern and are difficult to tune smoothly. People don't realize it until they drive a properly setup car with modern injectors. I would go with Bosch EV14s or Injector Dynamics 725 primaries/2000cc secondaries. What kind of map do you have in there?
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Not trying to be harsh but the first think I would do is throw those injectors in the garbage. They are 1970s technology. They have a poor spray pattern and are difficult to tune smoothly. People don't realize it until they drive a properly setup car with modern injectors. I would go with Bosch EV14s or Injector Dynamics 725 primaries/2000cc secondaries. What kind of map do you have in there?
#10
The pressure is quite high was it tuned like that ?
Have you got a after market fuel pressure reg
This sounds like the tps isnt 100%
Was it fine before the clean ?
You could take a vid of how its running give a better idea
Have you got a after market fuel pressure reg
This sounds like the tps isnt 100%
Was it fine before the clean ?
You could take a vid of how its running give a better idea
Last edited by imitek; 10-27-15 at 07:27 PM.
#11
Not trying to be harsh but the first think I would do is throw those injectors in the garbage. They are 1970s technology. They have a poor spray pattern and are difficult to tune smoothly. People don't realize it until they drive a properly setup car with modern injectors. I would go with Bosch EV14s or Injector Dynamics 725 primaries/2000cc secondaries. What kind of map do you have in there?
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Yes i do have a aftermarket fuel pressure regulator. And yes i think it was tuned at that pressure. It was perfectly fine before cleaning. I might have done something wrong with the tps but i have no clue what i could have done wrong.
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Ill shove my multimeter in there Tommorow and let you know how that goes.
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alright so i got the tps tuned and im still having my same issue. I have a few videos of me pulling the throttle cable and the car running. Not sure how i can post them here. I still really could use some rotors help.
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