Throttle stuck wide open with closed butterflies on the carb
04-12-23, 11:11 AM
#1
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Throttle stuck wide open with closed butterflies on the carb
I run the stock nikki carb and when i start the car it goes straight to redline the throttle cable is fine the butterflies are closed on the carb i dont know what to do or what causes it to do that please help
Last edited by Ketsis; 04-12-23 at 11:12 AM. Reason: Misspell
04-13-23, 01:39 PM
#3
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I have had it for 3 years i pulled the engine out for the second time in my ownership to fix the o ring from the front plate because i had low oil pressure i put everything back together and when i turn it on it goes instantly to red line all the cables are fine i am really confused
04-14-23, 02:16 AM
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No all the linkages outside the carb are fine i didn't mess with the carb at all but the only thing I did is that i removed the 4 bolts from underneath and put it upside down on the part between the windscreen and the hood only that i think might have messed something up, the fact that i let it rest upside down
04-15-23, 05:16 AM
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Yes i did that, also i tried playing with the mixture screws i closed the idle screw and the fuel screw all the way and in theory it shouldn't turn on but doesn't change anything still goes for the red line i unscrewed as much as i could to see if there was a difference still nothing
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04-15-23, 04:26 PM
#8
okay. if the idle screw are not making any difference one way or another, then that (to me) sounds like a leak. there should be a nipple coming out the intake manifold (the rear secondary runner), near the tranny. it's sort of hard to see. check and see if the hose is not connected or broken.
04-28-23, 06:09 PM
#11
download the FSM: Foxed.ca
there is a procedure in there to set them.
also, this link may help: https://www.rx7club.com/1st-generati...e-carb-310927/
there is a procedure in there to set them.
also, this link may help: https://www.rx7club.com/1st-generati...e-carb-310927/
05-03-23, 12:13 AM
#12
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I rebuild the carb and still the same.. could it be the timing i mean the problem happened after i pulled the engine out and put it back in while i didn't do anything on the carb could i have advanced the timing so much ???
05-06-23, 11:04 AM
#13
did you check that port/nipple on the back of the manifold?
timing? for what you're describing, the simple answer is no. besides, when the RPM goes up because of timing, the adjustment screws still have an effect.
here's a random thought, are you sure the throttle shaft is not twisted or bent in any way? i saw that happen once with an Rx-3 carb. bad idle, not exactly what you're experiencing, but i'm running out of ideas.
timing? for what you're describing, the simple answer is no. besides, when the RPM goes up because of timing, the adjustment screws still have an effect.
here's a random thought, are you sure the throttle shaft is not twisted or bent in any way? i saw that happen once with an Rx-3 carb. bad idle, not exactly what you're experiencing, but i'm running out of ideas.
05-07-23, 09:21 AM
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the throttle blades are closed and it goes to redline i checked the linkages many times sadly they are not the issue, what is the tittrer-totter?
05-07-23, 10:17 AM
#16
if you find where the main throttle spring (the big one with the rubber shield) attaches at it's upper end, that linkage is the teeter-totter.
you will see it in post #81 of this thread: https://www.rx7club.com/1st-generati...-964025/page2/
you will see it in post #81 of this thread: https://www.rx7club.com/1st-generati...-964025/page2/
05-07-23, 04:08 PM
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as i said it happened after i had pulled the engine out of the car i didnt touch the carb i didnt even take out the fuel lines and rested it in front of the windscreen i havent pulled anything from the carb before this issue started.
05-07-23, 05:30 PM
#20
Troubleshooting at this level is only good with a known configuration, i.e. all factory parts without modifications. Based on what I see, your setup is not factory. It could be a EU factory setup, but I don't know what that is. This is where the pics help.
05-08-23, 02:28 AM
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i didnt rebuild the engine i took it out because of low oil presure i removed the front cover to change the o ring this is the second time i took the engine out for the same reason
05-12-23, 11:29 AM
#23
You might try making a blank (wood, metal, whatever) to bolt on top of the carb in place of the air cleaner. If it still starts up and runs, then it seems to me you have to have a vacuum leak. With the inlet of the carb totally blocked no air can get in there, so it seems like it would have to be a leak. Of course, you will still have a vacuum on the carb so fuel will still be getting sucked in through the idle and probably main circuits. Seems worth a try.
Carl
Carl
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