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Old 09-16-2015, 09:58 AM   #1 (permalink)
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Default What keeps my Engine from Revving past 4000 rpm. ?

What circuits are directly related to Causing this issue on my '95 civic ex. Engine is not revving past 4000 rpm.
Starts up and Runs fine. Just will Not rev past 4000 rpm. Speed sensor,? What all else. No check engine light.
Any and all help Is Appreciated..
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Old 09-16-2015, 11:01 AM   #2 (permalink)
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It sounds like the ECU is in limp mode - have you checked for codes on the ECU?
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Old 09-16-2015, 11:25 AM   #3 (permalink)
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I've seen a similar situation with my sister in laws del sol. It turned out to be the distributor, my brother and I believed that the distributor was have issues advancing when the engine accelerated to higher rpms.
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Old 09-16-2015, 12:15 PM   #4 (permalink)
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Quote:
Originally Posted by AJAY View Post
I've seen a similar situation with my sister in laws del sol. It turned out to be the distributor, my brother and I believed that the distributor was have issues advancing when the engine accelerated to higher rpms.
I believe it was a weak ignition coil. (which is inside the distributor) Hondas with weak coils tend to crap out right around 4k.
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Old 09-16-2015, 03:55 PM   #5 (permalink)
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a weak coil would not just cut out at 4k. it would "break up" as in would proibably rev to redline with minimal load (downa hil for example) or idle, able to rev.


he seems to be describing a redline of sorts AT 4k.
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Old 09-16-2015, 04:03 PM   #6 (permalink)
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limp mode. are you sure your check engine light actually works? check for codes.
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Old 09-16-2015, 07:43 PM   #7 (permalink)
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I checked Codes. They are None. No check Engine light. Nothing at all..
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Old 09-16-2015, 07:47 PM   #8 (permalink)
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I'm at a loss here guys..! If I had a Code I Could see a direction to go in for repair. There isn't Any codes.! Like a 4000 rpm rev limiter...
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Old 09-16-2015, 07:50 PM   #9 (permalink)
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No codes at all
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Old 09-16-2015, 09:58 PM   #10 (permalink)
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Does the CEL illuminate then go out during key-on?

I've had a car that ran like ass and the bulb for the CEL was removed from the cluster. After the bulb was replaced, codes galore.
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Old 09-18-2015, 06:51 AM   #11 (permalink)
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Ya, even with no codes present when you jump the service connector the CEL should illuminate. If that didn't happen your bulb isn't working.
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Old 09-18-2015, 07:01 AM   #12 (permalink)
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I'm very curious what kind of fixes people have for cars in limp mode. Mine has the same symptoms, but a solid CEL that cannot be checked.

I'll be watching for the OP's solution.
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Old 09-18-2015, 07:08 AM   #13 (permalink)
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Solid cell is a bad ecu man
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Old 09-18-2015, 08:00 AM   #14 (permalink)
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Solid cell is a bad ecu man
I don't think I have 3 bad ECUs though. Furthermore, the ECU works on my CRX but not on the car in question. Bad wiring is my guess, but I've been looking for other explanations.

Sorry OP! Not trying to thread jack. I'm just hopeful for this thread.
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Old 09-18-2015, 09:00 AM   #15 (permalink)
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Quote:
Originally Posted by HRTuning View Post
Ya, even with no codes present when you jump the service connector the CEL should illuminate. If that didn't happen your bulb isn't working.
chyep. google your generation and search for a fsm to download. then trouble shoot. also, try another ecu and see if its still going into limp mode.
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