why cant i go past 4k RPM????
car spec:
87 rx7 N/A new oil new plugs new fuel pump and filter new ING wires for some reason when i drive my car it feels like i hit a hardcore rev limiter crazy hesitation and jerking at 4k RPM!! what may cause this?! |
did it happen randomly or have you done something right before it started?
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Can you free rev the car in neutral past this supposed wall? When driving can you slowly pass the 4000 rpm level?
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Originally Posted by barkz
(Post 11226790)
did it happen randomly or have you done something right before it started?
Originally Posted by satch
(Post 11226805)
Can you free rev the car in neutral past this supposed wall? When driving can you slowly pass the 4000 rpm level?
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plug in your secondary injectors.
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Originally Posted by RotaryEvolution
(Post 11226833)
plug in your secondary injectors.
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check them again.
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There are two wires for each injector plug. If either wire is pulled back within the plug then that injector won't work. Can you rev the car while idling to a rather high rpm?
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Originally Posted by satch
(Post 11226890)
There are two wires for each injector plug. If either wire is pulled back within the plug then that injector won't work. Can you rev the car while idling to a rather high rpm?
tps? |
have you tried the search function.. its as easy as searching for 3800 rpm hesitation,, 15 billion threads on it .. its usually a fault in the loom crimps .. and the faulty crimps are about 25 cm up the loom from the ecu
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If you cannot rev the car while idling in neutral past 4000 rpm then you can check your fuel pressure and you might want to remove the O2 sensor (unscrew it from its housing) so as to check and see if things change for the better.
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not likely crimps if it is a california car, unless it came from an eastern state and driven through winters.
pull the secondary injector clips off and inspect the pins, tug the wires a little bit and see if any are pulling out. takes less than 5 minutes. if the engine was ever worked on MOST ALL of the time i see that people just yank off the connectors because they can't figure out the simple wire locking mechanism that holds them in place. could be a plugged up cat like Satch is indicating but it wouldn't be a quick transition and the car would likely rev freely all the way to redline until put under a load. the TPS wouldn't be faulty at a set RPM, it would be faulty at a certain throttle position. fuel pressure would be the second place i would look outside the secondary injector clips. a plugged up fuel filter or dying pump will still allow the engine to run but it will start to run out of fuel when you load the engine up, especially when the injectors are transitioning at 3850 RPMs. |
Originally Posted by satch
(Post 11227002)
If you cannot rev the car while idling in neutral past 4000 rpm then you can check your fuel pressure and you might want to remove the O2 sensor (unscrew it from its housing) so as to check and see if things change for the better.
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tps calibration/swap ..do this first
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..uh guys...
https://www.rx7club.com/2nd-generati...-help-1009284/ OP has had electrical problems before.If anyone cares to check his other threads out,it may help get this problem ironed out! |
Originally Posted by misterstyx69
(Post 11228434)
..uh guys...
https://www.rx7club.com/2nd-generati...-help-1009284/ OP has had electrical problems before.If anyone cares to check his other threads out,it may help get this problem ironed out! |
Its your secondary injectors, they either need to be replaces or the connections need to be cleaned, there is something called the "ground of death" which happened to me, you gotta pull the intake to get to it buts its worth it, unless you wanna rev half of what you could for the rest of your cars life
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Originally Posted by sbrmechanic
(Post 11228782)
Its your secondary injectors, they either need to be replaces or the connections need to be cleaned, there is something called the "ground of death" which happened to me, you gotta pull the intake to get to it buts its worth it, unless you wanna rev half of what you could for the rest of your cars life
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Originally Posted by drifter_xs
(Post 11229517)
Do you have a link to that thread? Thank you again
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scope that:
https://www.rx7club.com/2nd-generati...tering-998575/ and make sure the electrical connections that plug directly into your injectors are good, one of my metal pieces came out so now its connected with a peice of paper clip, ghetto mechanics haha |
Originally Posted by bumpstart
(Post 11228420)
tps calibration/swap ..do this first
Of course it could be any part of that circuit that's the problem... connections, the ecu, bad adjustment, or a bad TPS altogether. Make yourself a test light with about $10 in radioshack LEDs and terminals and hook up per the FSM. (There is a how to on here somewhere for it). Once I adjusted it correctly... the problem disappeared. On another RX-7 the TPS would not calibrate to make the lights do what they should. I replaced this one and adjusted the new one in... again, problem gone. |
Replace omp,ecu,tps at the same time.
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replace the car while you're at it.
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Originally Posted by RotaryEvolution
(Post 11232205)
replace the car while you're at it.
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Your trailing injectors might be wired backwards....check them.
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