I searched for a bit and couldn't find this exact problem..

My car is auto -> Manual swap. With s13 exhause cams on a 95 s14 rebuilt engine.

This has only happend to me twice since I have owned the car for 2 months. It hits 5k and bounces off it like a rev limit. It seems to be only when it is really damp/wet outside. This happend to me on saturday, then on sunday it was fine.. It actually reved a lil past 7k rpms.

So, I don't understand why this happens randomly.

It has Cold Air Intake/Header/Exhaust and new o2 sensor. So, Any ideas?

 

may be related to a fuel problem, maybe check your filter and make sure its not clogged or nething like that.

 

...valve srprings giving out and floating?

 

mine does that in 5th gear in my car? but i guess my car is topped out

 

Is it obvious if the valve springs are bad? Just by looking?

 

Well technically in a state of high rev there should be a bit of floating, this is what is called valve overlap. This is needed in order to maintain constant power at higher RPM.


In his case at a 5000RPM rev limit he should run an ecu diagnostic before concluding to anything in my opinion. May just be something really simple.

 

How/Where should I go to get this ECU diagnostic done?

 

I had similiar experience in my car, 1991 240, it would bounce off 5000 rpm like a rev limiter.

It was prominent in 5th gear, but I also noticed that if i rev the motor in any gear while I was moving, it would also rev to only 5k.

I recently replaced my ECU #24 to another ECU #24 with the limiters removed, and have had no problems.

My thought is this might be usual for the car, and not a problem at all.

Just my 2c

 

I tried searching but it won't let me search for ECU # 24 What do you mean by that? Did you get a whole new ECU or what?

 

Each ECU has a number in big bold print, to determine which ECU it is... now from what i know, the only difference in the ecus for s13 91-94 240sx's is their processing power... supposedly the higher the number, the faster it processes info... of course, i cant remember where i heard this, nor do i know how accurate this information is

 

Someone is selling a 95 3C ECU.. I have to check which one I have, but i know my engine is a 95.. That should work no matter what, right?

Also how do u disable the limiters?

 

How/Where should I go to get this ECU diagnostic done?

 

Im getting the same thing. Anyone else have any insight?

 

I bought my that way. No clue how to do it.

 

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