93 rx7 cutting out at exactly 5000 rpms
02-14-09, 02:05 PM
#1
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93 rx7 cutting out at exactly 5000 rpms
hey so i just picked up a twin turbo 93 imported rx7.
i am experiencing a BIG cut of some sort.
from idle to exactly 5000 rpm this thing runs beautifully. when it hits 5k it just cuts. completely shuts it down. as if the limiter is shutting it down.
now i thought at first it is experiencing some sort of fuel cut. i know that there is a limiter on this car but that should come in at redline, not 5k.
also im thinking it could have something to do with the ignition.
anybody else had this problem?
i am experiencing a BIG cut of some sort.
from idle to exactly 5000 rpm this thing runs beautifully. when it hits 5k it just cuts. completely shuts it down. as if the limiter is shutting it down.
now i thought at first it is experiencing some sort of fuel cut. i know that there is a limiter on this car but that should come in at redline, not 5k.
also im thinking it could have something to do with the ignition.
anybody else had this problem?
02-14-09, 03:02 PM
#2
Teddy bears have claws
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I'm having this problem right now. Try slowly accelerating, staying off of boost, and see if it will go past 5k. If it does, you probably have something wrong with your secondary injectors.
Here's my thread: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/right-diagnosis-818815/
Here's my thread: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/right-diagnosis-818815/
02-14-09, 03:59 PM
#4
Im thinking he has a failing coil or just needs spark plugs. The fact that it cuts off at 5k exact, all the time makes me think it has something to do with the injectors like someone said.
TO the OP: Can you rev past 5k in neutral?
02-14-09, 04:09 PM
#5
If you have a PFC-
Another idea, if you try the other two ideas for revving past 5k and cannot do it, make sure the rev limiter in the PFC is not set to 5k. I know I adjust mine in the RARE case I have to take it to a shop to perform a service I cannot do in my garage (wheel alignment). I set it to 2k so no one may have fun at my cars expense.
Other than that it sounds like what is listed above. Secondary injectors come on line at just below that rpm along with the transition to the second turbo. Replace your spark plugs and wires, check components (vac lines, solenoids, ect. that deal with 2nd turbo), make sure you are getting voltage to your secondary injectors, have the coils checked... Those are good places to start.
Another idea, if you try the other two ideas for revving past 5k and cannot do it, make sure the rev limiter in the PFC is not set to 5k. I know I adjust mine in the RARE case I have to take it to a shop to perform a service I cannot do in my garage (wheel alignment). I set it to 2k so no one may have fun at my cars expense.
Other than that it sounds like what is listed above. Secondary injectors come on line at just below that rpm along with the transition to the second turbo. Replace your spark plugs and wires, check components (vac lines, solenoids, ect. that deal with 2nd turbo), make sure you are getting voltage to your secondary injectors, have the coils checked... Those are good places to start.
02-14-09, 10:16 PM
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nah it wont rev passed 5k even if i try to stay off the boost.
and i am not sure if i have a pfc i have only owned this thing for a week now. what is a PFC?
how do i set my rev limiter in the PFC?
i will change my spark plugs as well.
also i did take first gear passed 5k. i hope its not injectors.
and i am not sure if i have a pfc i have only owned this thing for a week now. what is a PFC?
how do i set my rev limiter in the PFC?
i will change my spark plugs as well.
also i did take first gear passed 5k. i hope its not injectors.
02-15-09, 07:48 PM
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nah it wont rev passed 5k even if i try to stay off the boost.
and i am not sure if i have a pfc i have only owned this thing for a week now. what is a PFC?
how do i set my rev limiter in the PFC?
i will change my spark plugs as well.
also i did take first gear passed 5k. i hope its not injectors.
and i am not sure if i have a pfc i have only owned this thing for a week now. what is a PFC?
how do i set my rev limiter in the PFC?
i will change my spark plugs as well.
also i did take first gear passed 5k. i hope its not injectors.
What do you mean you took 1st gear passed 5k? You said at the top of your post that it won't rev passed 5k.
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02-15-09, 10:32 PM
#8
Yeah I am a little confused too. He just said it wouldn't rev past 5k and then it will in 1st???
And yeah, you can adjust the rev limiter from the commander.
I think you need to provide much more detailed information on your problem so that we may give you more adequate/correct advice.
And yeah, you can adjust the rev limiter from the commander.
I think you need to provide much more detailed information on your problem so that we may give you more adequate/correct advice.
02-15-09, 10:35 PM
#9
Wangan Junkie
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i had the same problem about a year ago, at first i thought it was fuel cut, then i tried all the ignition components, igniter, plugs, wires coils i tried it all, it was a combo of a bad engine ground and a fucken pinched vacuum line
check all your gorunds and make sure you dont have any vacuum lines broken, at least the ones that go to all the solenoids
check all your gorunds and make sure you dont have any vacuum lines broken, at least the ones that go to all the solenoids
02-16-09, 01:59 PM
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Yeah I am a little confused too. He just said it wouldn't rev past 5k and then it will in 1st???
And yeah, you can adjust the rev limiter from the commander.
I think you need to provide much more detailed information on your problem so that we may give you more adequate/correct advice.
And yeah, you can adjust the rev limiter from the commander.
I think you need to provide much more detailed information on your problem so that we may give you more adequate/correct advice.
what do you mean more info?
it wont rev passed 5k.
on light throttle in first it did.
what else can i say? that describes what the car is doing perfectly.
do the secondary injectors kick in at 4800 always? or only under a heavy load?
i checked my vacuum lines and i found that on the air box, above the filter there is a large line that comes out to the center of the engine bay. it curves downwards for about 8 inchs and then ends. to me that does not make sense, wouldnt it suck unfiltered air through that? it seems as if it should be plugged into something.
02-16-09, 05:49 PM
#11
...Take a pic of the vac line you found laying unconnected and maybe we can identify it.
Try and pull any codes that the ecu is throwing (procedure is in the stickies).
02-16-09, 05:55 PM
#12
what do you mean more info?
it wont rev passed 5k.
on light throttle in first it did.
what else can i say? that describes what the car is doing perfectly.
do the secondary injectors kick in at 4800 always? or only under a heavy load?
i checked my vacuum lines and i found that on the air box, above the filter there is a large line that comes out to the center of the engine bay. it curves downwards for about 8 inchs and then ends. to me that does not make sense, wouldnt it suck unfiltered air through that? it seems as if it should be plugged into something.
it wont rev passed 5k.
on light throttle in first it did.
what else can i say? that describes what the car is doing perfectly.
do the secondary injectors kick in at 4800 always? or only under a heavy load?
i checked my vacuum lines and i found that on the air box, above the filter there is a large line that comes out to the center of the engine bay. it curves downwards for about 8 inchs and then ends. to me that does not make sense, wouldnt it suck unfiltered air through that? it seems as if it should be plugged into something.
Not sure if it makes any difference but you didnt answer my question before.
Can the car rev fine past 5k in NEUTRAL???
02-18-09, 12:34 PM
#14
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what do you mean more info?
it wont rev passed 5k.
on light throttle in first it did.
what else can i say? that describes what the car is doing perfectly.
do the secondary injectors kick in at 4800 always? or only under a heavy load?
i checked my vacuum lines and i found that on the air box, above the filter there is a large line that comes out to the center of the engine bay. it curves downwards for about 8 inchs and then ends. to me that does not make sense, wouldnt it suck unfiltered air through that? it seems as if it should be plugged into something.
it wont rev passed 5k.
on light throttle in first it did.
what else can i say? that describes what the car is doing perfectly.
do the secondary injectors kick in at 4800 always? or only under a heavy load?
i checked my vacuum lines and i found that on the air box, above the filter there is a large line that comes out to the center of the engine bay. it curves downwards for about 8 inchs and then ends. to me that does not make sense, wouldnt it suck unfiltered air through that? it seems as if it should be plugged into something.
I would guess the line coming out of the back of the air box is either for your BOV or your air pump. Either way, if it is on the top of the air box, it should be plugged. Do you still have the air pump? It would be a big thing with a pulley to the left of the alternator. If you post a pic, someone here can identify the hose too.
02-19-09, 10:11 PM
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hm i wonder if the air pump not being hooked up would have anything to do with the power cut. and also the abysmal emissions tests results.
also today the second time the rx7 has been driven i really tried to find out exactly what the thing is doing.
in first gear it will rev right to the red line with no problems
second gear 5000 rpm cut
third gear 5000 rpm cut
fourth gear was at 4000 rpm,
and in fifth gear it would not go over 140 km
in third gear cruising at 2500 rpm, if i put my foot into it, the engine would cut.
i am going to have start removing the air box and look to see if that line came off the air pump.
i will post pictures tomorrow of the tube if i am unsuccessful.
also today the second time the rx7 has been driven i really tried to find out exactly what the thing is doing.
in first gear it will rev right to the red line with no problems
second gear 5000 rpm cut
third gear 5000 rpm cut
fourth gear was at 4000 rpm,
and in fifth gear it would not go over 140 km
in third gear cruising at 2500 rpm, if i put my foot into it, the engine would cut.
i am going to have start removing the air box and look to see if that line came off the air pump.
i will post pictures tomorrow of the tube if i am unsuccessful.
02-20-09, 07:04 AM
#16
Racecar - Formula 2000
HMMMMMMMMM........
Maybe this is too simple, but it sounds a lot like a clogged fuel filter. Either the "sock" filter before the pump, or the main filter that we all "love" to change. How long has your filter been in there since it's been changed?
Maybe this is too simple, but it sounds a lot like a clogged fuel filter. Either the "sock" filter before the pump, or the main filter that we all "love" to change. How long has your filter been in there since it's been changed?
02-20-09, 02:07 PM
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YEAH!! i said fuel filter as well. i also said maybe the fuel pump, but weird that a pump would work and then suddenly not work so i kinda ruled that out.... for now.
and just to make things clear as to why this problem is not fixed yet, its not my car.
i have a 94 mazda mx3 that i swapped a 2.5l klze engine into
this is my friends rx7 that i am helping with.
do you have to drop the tank to get to the fuel pump? my friends supra had this exact problem and it was because the fuel tank was rotten inside (it sat forever) the sock was completely clogged.
i am going to have him bring the rx7 by my place today and im going to find out where this air pump is and see if that line should plug into it.
but so far guys, great help keep it up, looks like you have a good community here. props!!
and just to make things clear as to why this problem is not fixed yet, its not my car.
i have a 94 mazda mx3 that i swapped a 2.5l klze engine into
this is my friends rx7 that i am helping with.
do you have to drop the tank to get to the fuel pump? my friends supra had this exact problem and it was because the fuel tank was rotten inside (it sat forever) the sock was completely clogged.
i am going to have him bring the rx7 by my place today and im going to find out where this air pump is and see if that line should plug into it.
but so far guys, great help keep it up, looks like you have a good community here. props!!
02-20-09, 02:38 PM
#18
Racecar - Formula 2000
The pump can then be removed along with the tank cover plate, IIRC.
03-12-09, 11:17 PM
#20
Good luck.
-s-
03-18-09, 08:51 PM
#22
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Pop the connector off your secondary injectors-
Use a ohm meter and check for resistance of each injector
Bad injector-
Open circuit
It's a limp mode
Basically when ever it tries to use the secondaries it knows it doesn't work so just cuts off fuel to all injectors (why u can rev in neutral and it's gear dependant).
Had same problem - had a voltage spike and fried a injector (voltage regulator in my alt went out).
Use a ohm meter and check for resistance of each injector
Bad injector-
Open circuit
It's a limp mode
Basically when ever it tries to use the secondaries it knows it doesn't work so just cuts off fuel to all injectors (why u can rev in neutral and it's gear dependant).
Had same problem - had a voltage spike and fried a injector (voltage regulator in my alt went out).
10-03-10, 10:09 PM
#24
I have a parallel problem with my 90 vert na. It wont got over 4500-4800 rpm even in neutral. Checked all the grounds, new injectors, manifold gaskets, afm, checked and double checked for vac leaks. I just replaced the trailing coil and its sparking however I still have a trailing coil and bypass sol code. Somebody help me please!
02-02-11, 11:24 AM
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hey so i just picked up a twin turbo 93 imported rx7.
i am experiencing a BIG cut of some sort.
from idle to exactly 5000 rpm this thing runs beautifully. when it hits 5k it just cuts. completely shuts it down. as if the limiter is shutting it down.
now i thought at first it is experiencing some sort of fuel cut. i know that there is a limiter on this car but that should come in at redline, not 5k.
also im thinking it could have something to do with the ignition.
anybody else had this problem?
i am experiencing a BIG cut of some sort.
from idle to exactly 5000 rpm this thing runs beautifully. when it hits 5k it just cuts. completely shuts it down. as if the limiter is shutting it down.
now i thought at first it is experiencing some sort of fuel cut. i know that there is a limiter on this car but that should come in at redline, not 5k.
also im thinking it could have something to do with the ignition.
anybody else had this problem?