New 92 Owner problem - rev limiter kicks in early

T

tcomegna

Registered Member
Joined
2 April 2006
Messages
34
hey guys i just recieved my 92 nsx and the rev limiter kicks in at 7100rpm. I know this is a common problem but here is my situation.
1)VTEC does kick in ( i can hear and feel it ), didn't work
2)i just recieved an oil change (royal purple), didn't work
3) already replaced intake to see if problem disappears, it didn't work
4) attempted it with TCS on and off, didn't work
5) attempted to pass 7100rpm on 1st, 2nd, 3rd gear, didn't work
6) Most importantly i let me nsx warm up completely (one time over 1 hour of light driving) until the temperature gage is just below the middle.

So guys, what is the true problem??? Do i need to get a new ECU or tune it??? Please help me, this problem is very annoying since the fun begins at 7000k all the way to redline. Thanks guys
 
Re: New 92 Owner PROBLEM, need help

Is the ECU throwing any codes? It's possible there is a separate temp sensor for the gauge and for the ECU. The problem may lie in the ECU temp sensor area.


tcomegna said:
hey guys i just recieved my 92 nsx and the rev limiter kicks in at 7100rpm. I know this is a common problem but here is my situation.
1)VTEC does kick in ( i can hear and feel it ), didn't work
2)i just recieved an oil change (royal purple), didn't work
3) already replaced intake to see if problem disappears, it didn't work
4) attempted it with TCS on and off, didn't work
5) attempted to pass 7100rpm on 1st, 2nd, 3rd gear, didn't work
6) Most importantly i let me nsx warm up completely (one time over 1 hour of light driving) until the temperature gage is just below the middle.

So guys, what is the true problem??? Do i need to get a new ECU or tune it??? Please help me, this problem is very annoying since the fun begins at 7000k all the way to redline. Thanks guys
Click to expand...
 
Re: New 92 Owner PROBLEM, need help

Is the car stock or modified? (you mentioned changing the intake)
Miles and history of maintenance would also be helpful (ie: timing belt, valve adjustment, etc)
 
Re: New 92 Owner PROBLEM, need help

Russ said:
Doubtful. It's probably attached to the engine.

See http://www.nsxprime.com/FAQ/Reference/1991_svcman/1991_svcman.htm
Click to expand...

Yes, check page 224 of the service manual. I had this problem before, and BrianK pointed me to the right area. Do the DIY ECU code check (instructions in FAQ), and also check the sensor and the wiring. It is probably a problem with that.

Somewhere along the line, your ECU thinks that the engine is not warmed up.
 
Re: New 92 Owner PROBLEM, need help

Is the check engine light on? Does the check engine light come on when you first turn the key to II position and goes off after you start the car? If the MIL does not come on at all, someone may have remove the bulb to conceal a check engine light problem.:frown: When MIL comes on, you will not be able to rev past 7100 rpm.
 
MAJOR Problem, Help please

Hey guys, i just bought a 92 NSX and the rev limiter kicks in at 7000rpm.
But here's the situation..
1) VTEC does kick in(i can feel it at 6000rpm)
2) I have tried to pass 7000rpm with TCS on and off on all 1st, 2nd and 3rd gears.
3) the car is completely warmed up( the temperature gauge is just below the middle.
4) brand new oil change
5)I just had a honda mechanic check fo ECU codes, but no codes have been thrown.

So guys, does anyone know the true problem???? Could the problem lie at the tachomaeter showing wrong readings, although i can feel VTEC at 6000rpm and also 1st gear maxed out at 40mph, 2nd at just over 70mph(does that sound right?) This is very annoying since the fun begins at 7000 rpm. Please help me

Tom.
 
Re: MAJOR Problem, Help please

If the engine is cold, the rev limiter kicks in at lower rpms. Are you letting it warm up sufficiently before getting on it?
 
Re: MAJOR Problem, Help please

rbirling is on the right track. Check your temp gauge, if OK, you may have a failed temp sensor. Any CEL??

HTH,
LarryB
 
Re: MAJOR Problem, Help please

I had a similar problem with my car when I first got it. The car would take FOREVER to warm up and in turn cause the rev limiter to kick in early. I had to drive the car for about 20 min before I could really get on it. I asked around and people said check your thermostat. I check it and found that the seal on the inside was bad. I replaced the thermostat and BAM! problem fixed!!
 
Re: MAJOR Problem, Help please

hey guys thanks for the replies.
I will try to let it warm up even longer, however one time i drove it for about a half hour and the temp reading was just below the middle and it still had the early rev limiter.
Also, if the thermostat was faulty, would it not throw any codes?? Like stated earlier i have not thrown any codes at all. Also, would it be possible to get the rev limiter completely removed through dyno tuning and plaung with the ecu?? looking forward to more responses.

Tom
 
Re: MAJOR Problem, Help please

tcomegna said:
Also, if the thermostat was faulty, would it not throw any codes?? Like stated earlier i have not thrown any codes at all.
Tom
Click to expand...

I did not throw any codes when my thermostat went bad.
 
Re: MAJOR Problem, Help please

In OBDI you'd be surprised how many "small" things could go without throwing a CEL. Sometimes early OBDII cars are the same way.
 
MAJOR PROBLEM, still need more opinions

Hey guys, i just bought a 92 NSX and the rev limiter kicks in at 7000rpm.
But here's the situation..
1) VTEC does kick in(i can feel it at 6000rpm)
2) I have tried to pass 7000rpm with TCS on and off on all 1st, 2nd and 3rd gears.
3) the car is completely warmed up( the temperature gauge is just below the middle.
4) brand new oil change
5)I just had a honda mechanic check fo ECU codes, but no codes have been thrown.
6)The water pump and timing belt were replaced before i purchased the car 4 months ago. The car runs great, its very powerful but i have not felt it's true power yet because of this problem.
7) I have a new thermostat and ecu temp sensor which i have not yet installed. If i put these new parts in and the problem does not go away, what else could i do???

I have also inspected the temperature sensor which is below the thermostat area and it appears to be very rusty.
I'm still a newbie. please help me fix this problem, this is my thrid post.

thank guys, looking forward to replies
 
Re: MAJOR PROBLEM, still need more opinions

Before you go crazy with looking for a mechanical issue, Id confirm that the tach isnt out of calibration.

Any reason to believe that the cluster has been touched?
 
Re: MAJOR PROBLEM, still need more opinions

BioBanker said:
Before you go crazy with looking for a mechanical issue, Id confirm that the tach isnt out of calibration.

Any reason to believe that the cluster has been touched?
Click to expand...

The speedo would have to be off also because his shift points are not correct for a 5-speed.

Even a Auto motor redlines at 7500RPM.

Something doesn't make sense.

As for the "True" power, you will not "FEEL" any difference at 7K vs 8K. The NSX builds speed very linear all the way to redline. You really shouldn't feel a VTEC kick either.
 
Re: MAJOR Problem, Help please

Maybe there's something wrong with the Vehicle Speed Sensor (VSS).
 
Re: MAJOR Problem, Help please

DocL said:
Maybe there's something wrong with the Vehicle Speed Sensor (VSS).
Click to expand...


I concur
crimson_tide.jpg



Armando
 
Re: MAJOR PROBLEM, still need more opinions

NetViper said:
The speedo would have to be off also because his shift points are not correct for a 5-speed.

Even a Auto motor redlines at 7500RPM.

Something doesn't make sense.

As for the "True" power, you will not "FEEL" any difference at 7K vs 8K. The NSX builds speed very linear all the way to redline. You really shouldn't feel a VTEC kick either.
Click to expand...

I agree, the NSX does not really have a VTEC kick. The S2000, in contrast, has a very prominent VTEC kick.
 
Re: MAJOR Problem, Help please

I vote for a bad TW sensor or bad conection to it. as the temp goes up its resistance goes down so a higher resistance means the engine is still cold which will cause the ECU to limit the max RPM. See the online manual here on prime sec. 11 page 48 and 49

TW sensor
7588Picture_013-2-med.JPG
 
Last edited:
Re: MAJOR Problem, Help please

first off thanks for all the replies i appreciate the promptness, second of all yes you can slightly feel and obviously hear the VTEC kick in, and finally i haven't felt it's true power because have you ever shifted at 7000rpm into 2nd or 3rd? that takes you even lower on the rpms and therefore further away from peak horsepower. Nobody would be shifting at 7000rpm if they want to race an nsx unless they weren't the brightest people.

Also i did not throw any codes, im just wondering if these faulty sensors could get past the analysis without notice.

Tom
 
Re: MAJOR Problem, Help please

also just to confirm that the tach is Not out of calibration, at 7000rpm second gear at the limiter I am travelling at 70mph which is about 10mph short of what you should be travelling at redline.
 

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