RPM goes to 7750, strange problem Options

[Red123]

Hello guys.
About 1 week ago I got some strange problem.
Engine rpm goes to 7750 instead of 7250 and an engine light turns on.
I have AEM FIC 6 installed and Apexi Gen 1 RSM.
Removed AEM FIC and have same problem. Apexi RSM as I know doesn't have remove rev limiter function. personally I don't think that's it's an apexi problem.


What do you think guys?

This post has been edited by Red123: Jan 8, 2013 - 8:26 AM

[Smaay]

its definitely not the RSM, its just a REV SPEED METER. the FIC doesn't raise the rev limiter either. im guessing the crystals on the ECU might be going bad.

[Red123]

its definitely not the RSM, its just a REV SPEED METER. the FIC doesn't raise the rev limiter either. im guessing the crystals on the ECU might be going bad.

Thanks

If it's a problem of crystals in ECU , there's no chance to repair it? Should I change an ECU or what? Also can I install MR2 GT-S 1995 ECU just for testing purposes?

p.s engine is working fine on that rpm, not a starting problem or any others like that. just rpm goes to 7750.

This post has been edited by Red123: Jan 8, 2013 - 10:34 AM

[Box]

Just shift at 7,200? It's possible to repair the ECU, but for what that'd cost you could just buy a new one.

[Red123]

Can an increased RPM be caused by damaged knock sensor?

[Rusty]

factory ecu? could be a remaped/plug in ecu?

[Smaay]

Can an increased RPM be caused by damaged knock sensor?

no it would be the opposite, the ECU would be in safe mode. i wouldn't worry about it, just shift around 7000 RPMs

[delusionz]

whats telling you 7750rpm? i find it hard to believe the ecu will allow that

[Red123]

removed AEM Fic, removed Apexi RSM and still the same RPM.
After that installed 1995 GT-S MR2's ECU, and RPM goes to 7400-7500 not 7750. funny is that when I removed MR2 ecu from my car and installed it in MR2 again, MR2 has the same problem RPM goes to 7250+. )))
BTW I have a damaged knock sensor, check engine light is on after 3000 RPM and as I read it probably caused by damaged knock sensor.


Rusty

CODE

factory ecu? could be a remaped/plug in ecu?

I have AEM FIC installed in my car, but it's the same if I remove AEM.

Smaay
Thanks.

delusionz
tachometer is telling. Also Apexi RSM.

[Smaay]

again you are worrying about nothing, when i had an Apexi RSM on my 7th gen, it would hit 8500 sometimes with the stock ECU. and then sometimes it would only hit 8300.

[Red123]

again you are worrying about nothing, when i had an Apexi RSM on my 7th gen, it would hit 8500 sometimes with the stock ECU. and then sometimes it would only hit 8300.

I don't worry about it. I'll shift on max 7K RPM or something, but do you think it's a wiring problem of RSM?

[Smaay]

no the RSM has nothing to do with it.

[Red123]

The check engine problem was solved by replacing a knock sensor.
and on my rpm problem I found this one:
https://www.assembla.com/spaces/3SGTE_ECU/w...n_Modifications

CODE

Standard rev limit is 7400 RPM (The stock rev counter is not that accurate so it's widely reported the rev limit is 7200-7250).
There are 2 places in the standard code that implement the rev limit:

By changing the 94h to a higher value, the rev limit can be increased.  To calculate the value required take the required rev limit and divide it by 50. For example:
7400 / 50 = 94h
7750 / 50 = 9Bh

This post has been edited by Red123: Apr 30, 2013 - 5:17 PM