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'99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

 
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Old 02-27-2012, 04:41 PM
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Icon8 '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

Have a 1999 Prelude Auto with a very unique issue. Here's the list of symptoms:

Rev Limiter at 6,500
VTEC Still Works
No Check Engine Lights, but the CEL is known to work.
Speedometer Still Works
The car appropriately skips VTEC when it's cold, but the rev limiter is at 6,500 regardless of engine temp.
The car is bone stock, no aftermarket engine management.
Coolant and oil levels are fine, coolant recently bled.

There was a D-series guy who had a similar issue, and he replaced coolant sensors and thermostat which fixed it, but because my car still skips VTEC when it's cold, but allows it when it's warm, I doubt this is the issue.

There was a Prelude guy who said it went away when he switched to OBD1, he had a manual transmission. I've learned that OBD1 doesn't use secondary O2 sensors, CKF sensor and knock sensors. Is it possible any of these are the culprit?

I have what seems like a bad LMA that sporadically causes loud ticking around the driver's side of the engine bay. Is it possible the LMA tick is setting off the knock sensor and this is what's keeping me from going over 6,500? The tick seems to come and go, usually brought on by hard or long drives; maybe it actually is detonation? See videos below:

Here's a video of when it's bad:
http://s1136.photobucket.com/albums/...-29-57_295.mp4

Here's one of when it's not so bad:
http://s1136.photobucket.com/albums/...-58-29_290.mp4


Ask any clarifying questions you need. Any help or input would be deeply appreciated, this one has me stumped.


Thanks!
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Old 02-27-2012, 05:30 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

its an auto. where are you trying to rev an automatic to? you should not hit VTEC till the engine is warmed up
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Old 02-27-2012, 05:33 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

nice to see you posted here after you didn't get help on preludepower
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Old 02-27-2012, 05:40 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

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its an auto. where are you trying to rev an automatic to? you should not hit VTEC till the engine is warmed up
The auto will rev just as high as the manual, so I usually rev to it just below red-line then shift to keep it in VTEC as much as possible. When I'm racing, that is.

And I know I shouldn't hit VTEC when it's cold; I just posted that to rule out the temp sensors as the cause.

Let me know if you think of anything.
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Old 02-27-2012, 05:41 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

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Originally Posted by ogsmakdade View Post
nice to see you posted here after you didn't get help on preludepower
Oddly, the only responses here so far are from people who are also PP members. :P
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Old 02-27-2012, 05:51 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

LOL im going to post on pp now. i think the rev limiter is normal for automatics
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Old 02-27-2012, 05:52 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

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Originally Posted by M0B5TA View Post
LOL im going to post on pp now. i think the rev limiter is normal for automatics
in park, yes.
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Old 02-27-2012, 06:08 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

i dont know too much about automagics but i drove my friends suv with sliptronic and it wouldnt let me go over a set rpm
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Old 02-27-2012, 06:16 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

Fixed the video links.

And I've been up to 8,000 or so before in RPMs, just trying to figure out why it won't let me now.
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Old 02-28-2012, 11:20 AM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

Ive pushed my auto to 7400. No rev limiter yet. But I think when parked it may cap you at 6500. But I cant imagine sitting in my driveway revving that high for no reason. With gas prices the way they are Im not wasting money like that or beating on my car for no reason.
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Old 02-28-2012, 12:34 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

Yeah, unless the vehicle is moving, the ECU won't let the auto or the manual versions go over 6,500. Also, if the auto is in neutral or park, it won't let you rev over 6,500. If the engine is too cold, it won't let you rev over 6,500. I'm getting an OBD2 Scanner in the mail this week which will tell me exactly what the ECU thinks about my engine, hopefully. With that, I can cross-reference the Helms for any known conditions that set off the rev limiter, and hopefully I'll find something sensor related that's cheaper than the $150 it will cost me to replace the ECU and get a franken-key made.
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Old 03-06-2012, 09:34 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

Did you ever figure out what the problem was?
I have a 98 auto and tried to push it tonight
and it would not let me rev over 6500 while in
D4 have not tried it in slap mode yet.
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Old 03-08-2012, 03:22 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

Not yet. Pretty sure it's timing belt related, but I'm not positive. My timing belt is walking off the cam gears on the driver's side, grinding itself into dust. My hypothesis is that wherever my mechanic ordered the belt from sent him one with one less tooth than it should have. A rare issue, but it's happened before.

If I find a solution, I'll be sure to post it in all the threads I have open.
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Old 03-08-2012, 07:05 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

Thanks same here!
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Old 06-21-2012, 07:13 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

I have a similar issue, hope someone has heard of this and can help.

Twice I have driven my car to Concord Ca where it's usually quite a bit warmer than where I live. Both times I have noticed that at idle, the temp gauge starts to move past the half way mark it normally is in, I blame this on the crap aftermarket main radiator fan the previous owner put in (Yes I am going to change it out)

Anyways, both times I have been out there, I have noticed that I cannot get v-tec to kick in. The engine just revs and seems to be limited on rev, can't say exactly where but it seemed to stop past the 6000rpm range. Once recently I almost crashed when I tried to get out of the way of an idiot in a pickup truck and I could not speed up fast enough.

Could the engine temp being high also cause v-tec to not kick in? Hoping it's something as simple as this.

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Old 06-22-2012, 10:36 PM
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Re: '99 Auto; Rev Limiter at 6.5; No CELs; VTEC Works

Quote:
Originally Posted by M0B5TA View Post
LOL im going to post on pp now. i think the rev limiter is normal for automatics
Why on earth would honda mate the H22A to an automatic gearbox and drop the rev limiter from 7650rpm to 6500rpm (H23A is limited to 6.5k), think about what you are proposing. Automatic's peak power is around 6.8-7k rpm...

I have seen up to 7720rpm on an SAFCII on my auto BB1 (my stock BB6 only goes to ~7650rpm), so they also rev as high as a manual... If in D4/D3 the auto box will shift early, normally between 7100-7300rpm, if you control it manually in 1st or 2nd you can rev to the rev limiter which you need to do if you want to keep the engine in Vtec in the next gear. Also, I recall reving above 7k while in park a few years ago, no Vtec obviously but it did go past 6.5k no problem.

I have seen oil temperatures of ~150-155'C (~305'F) on the drag strip and Vtec doesn't stop engaging so I don't think a high oil/coolant temp will prevent it. Low oil level, low coolant level and cold engine will affect it however. Oil sludge clogging specific ports in the Vtec solenoid can prevent Vtec engaging and can sometimes let vtec engage and give the 6.5k rev limiter. Only other sensor I am aware of (apart from the usual culprits) that can give the 6.5k rev limiter is the Vtec pressure sensor (VTM ECU input/oil pressure sensor after the Vtec solenoid).
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