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Full engine lockup at high RPM... wth?

 
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Old 05-18-2011, 02:19 AM
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Full engine lockup at high RPM... wth?

All,

I was asked for help with an issue by a fellow luder and cant think of an answer for her. To sum it up - 97 base 5mt w/108k miles. Ram air, ebay exhaust, rims. No other mods. All fluids are at proper levels and oil was changed last sunday.

When driving at high RPM (7400+) the car will randomly lock up for a second. This being the engine, not tranny or brake system. It leaves tire marks on the road when it happens.

I looked into the spark, air, and fuel systems and it all checked out fine. No DTC's to check either.

I've never had an engine lock up on me while driving so I dont know the feeling - but thats the only thing I can come up with. Like it locks up but force from the car moving in gear causes it to break apart again.

I am lost with this one...

Thanks for your time and help to anyone that replies to this.
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Old 05-18-2011, 04:37 AM
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Re: Full engine lockup at high RPM... wth?

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Originally Posted by Synergizer View Post
When driving at high RPM (7400+) the car will randomly lock up for a second.
After the red line then im assuming?

Sounds kind of like a rev-cut..
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Old 05-18-2011, 07:07 AM
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Re: Full engine lockup at high RPM... wth?

Rev-limiter? or ^^^
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Old 05-18-2011, 10:08 AM
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Re: Full engine lockup at high RPM... wth?

just curious, can a weak or failing auto tensioner cause that?
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Old 05-18-2011, 01:17 PM
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Re: Full engine lockup at high RPM... wth?

Is this like fuel cut off?
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Old 05-18-2011, 02:59 PM
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Re: Full engine lockup at high RPM... wth?

I'll check the auto tensioner tonight. Thanks for bringing that up - I didn't think about that one.

It's not the rev limitor since it happens at different RPMs. To explain the feeling think of it as full pedal in second gear, somewhere between 7400 and 8100 RPM slam the brakes (forget ABS). The front wheels lock up and there is no ABS feedback.
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Old 05-18-2011, 03:06 PM
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Re: Full engine lockup at high RPM... wth?

If it was the auto tensioner I don't think that it would lock up because the crank would still be free to rotate, something is stopping the crank from rotating if the tires lock up right?
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Old 05-18-2011, 05:10 PM
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Re: Full engine lockup at high RPM... wth?

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If it was the auto tensioner I don't think that it would lock up because the crank would still be free to rotate, something is stopping the crank from rotating if the tires lock up right?
yes. sounds like something MUCH more serious than a tensioner. sounds like something is getting jammed in the motor. maybe something in the cylinder? or something with the bearings? now why it only happens at high rpms i dont know.... but sounds like time for a rebuild.
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Old 05-19-2011, 12:13 AM
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Re: Full engine lockup at high RPM... wth?

Holy molybdenum! Wtf are you doing at 7400+ rpm? Then I saw 8100 rpm; your friend is crazy.
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Old 05-19-2011, 02:20 AM
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Re: Full engine lockup at high RPM... wth?

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Originally Posted by Menso View Post
Holy molybdenum! Wtf are you doing at 7400+ rpm? Then I saw 8100 rpm; your friend is crazy.
When I would be in the need for speed mood, I would shift my car at 8000-8200rpm. I was never woried about it since its a Honda and is fully capable of being revved to the moon for short periods of time(1st and 2nd gear, 7800rpm or so for the rest).

Anyways, back on topic. I checked her oil today and there was none left on the dipstick. The car smokes but not as much as I would expect for bad rings or valve problems. I dunno anymore honestly. How would something get in the way of the crank multiple times? I would expect there to be a hole in the block if that was the case.

Anyone have a H22a4 for sale? I sold mine already or I would have given it to her :/
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Old 05-19-2011, 09:36 AM
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Re: Full engine lockup at high RPM... wth?

hows the timing on the motor?
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Old 05-20-2011, 02:10 PM
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Re: Full engine lockup at high RPM... wth?

no oil on the stick... not good. smokes.. not good.

locks up??? hmmm...

and smokes... rings are shot. among other things..

ive had engines lock up and then break free... lack of oil will do that to main bearings and connecting rod bearings...

probally more damage done internally than one can describe here. not worth fixing id say..

time for a new engine.

and have her check that oil every week... VTECH engines use oil, especially when you are hitting above 5500 RPM alot.


good luck with that...
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Old 05-21-2011, 04:33 AM
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Re: Full engine lockup at high RPM... wth?

Well... It's a sad day today. Randy savage and Amy's engine both passed away. She said it did the lock up thing three times and then didn't break free the fourth time. Oil under the car.

She's buying her brothers 01 SH and I'm buying her 97 shell. I'll find a use for it..
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Old 05-21-2011, 03:12 PM
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Re: Full engine lockup at high RPM... wth?

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Originally Posted by Synergizer View Post
Well... It's a sad day today. Randy savage and Amy's engine both passed away. She said it did the lock up thing three times and then didn't break free the fourth time. Oil under the car.

She's buying her brothers 01 SH and I'm buying her 97 shell. I'll find a use for it..
Damn that sucks! I just thought of something it could have been also, if the bearings didn't have proper clearance then they could cause this couldn't they? Idk why she kept revving it that high if it kept locking up....
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Old 05-21-2011, 03:14 PM
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Re: Full engine lockup at high RPM... wth?

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Originally Posted by 97LudeDOHC View Post
and have her check that oil every week... VTECH engines use oil, especially when you are hitting above 5500 RPM alot.
vtec vtec vtec vtec vtec!
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