Hello!
I've been trying to diagnose an issue with rev range and hitting a 7.5k 'rev limit'. Stock AP2 (2009) with 170k miles. Recently purchased and discovered C3 had a burnt exhaust valve (CEL on the drive home from buying! :().
I've replaced and checked just about every gasket on the engine. New head gasket when reassembling - intake and exhaust gaskets as well for good measure. I've checked/cleaned the cat to ensure there's no blockage.
99% of the time the engine bounces off of ~7.5k RPM as if it's a rev limiter.
I bought a FlashPro to determine what's going on (was hoping the stock Hondata tune would fix the problem). So I have logs and the map (attached).
I noticed my throttle pedal sensor goes crazy when it's hitting that rev limiter, but I'm not sure if that's a problem or a symptom.
Anything stand out or sound familiar to anyone? :(
Thanks!
Stock S2K Premature Rev Limiter
Stock S2K Premature Rev Limiter
- Attachments
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- S2000-US-1.fpcal
- Map
- (1.01 KiB) Downloaded 96 times
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- UtahS2k.fpdl
- Datalog
- (278.58 KiB) Downloaded 88 times
Re: Stock S2K Premature Rev Limiter
So you had the same issue with the "rev limit" at 7500 with the OEM tune in it? This didn't start when you uploaded a calibration via FlashPro?
Re: Stock S2K Premature Rev Limiter
Yes - idk if it was OEM tune (bought used, 3rd owner) but it was owned by pretty tame though maintenance lacking individuals. No mods aside from a K&N air filter. Unfortunately I didn't have the chance to drive it hard before immediately having to pull the head to replace the burnt valve. So my reference is nonexistent for what's new since replacing the head. Hoping someone is able to determine from the data and their knowledge of the car what it could be.
I'm using 10w30 High Mileage Mobil 1
I've noticed oil leaking from the TCT - figured it was the triangle o-ring but after driving today (with the Hondata tune and datalogging), there's fresh drops of oil around the TCT. I'm going to pull it and replace the 2 o-rings - assuming those are the source/cause of the oil drips. Not sure that would cause the 7.5k rev limit issue though (due to oil pressure loss?)
Re: Stock S2K Premature Rev Limiter
Don't use Mobile 1, use Calstrol Syntec instead.
Re: Stock S2K Premature Rev Limiter
Yeah, going to switch next time but it is the Mobil 1 Extended Performance, which is supposedly decent (according to the s2ki forums).
If anyone is able to look at the data or has data requests, please let me know if you see anything - open to testing/trying just about anything at this point :(
If anyone is able to look at the data or has data requests, please let me know if you see anything - open to testing/trying just about anything at this point :(
Re: Stock S2K Premature Rev Limiter
If you return to stock and it still has a problem, then you will have to determine if it is a wiring issue, or a mechanical issue.
Re: Stock S2K Premature Rev Limiter
That's what I'm trying to determine - I was hoping the Hondata datalog info would help but I'm not seeing anything myself. But I don't have any experience with this stuff - just an enthusiast and a novice at that :D
Re: Stock S2K Premature Rev Limiter
If it is doing it stock and there are no errors, then I would recommend having a Honda dealer or a qualified shop look at it.
Re: Stock S2K Premature Rev Limiter
Sigh - cam timing was aligned to the red mark, instead of the white mark.
Issue resolved. Unbelievable
Issue resolved. Unbelievable