Is this strange or normal? (I made a video to show you) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-11-2004, 07:59 PM   #1
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Default Is this strange or normal? (I made a video to show you)

OK guys, I finally got my car on the road (I was waiting to take the Lesabre to the junk yard before putting the Bonne on the road). The car is a '96 SE with 117k on it. I don't know the previous service history but the car seems to run great.

However, this evening I got back from a drive (the car was running fine) and I wanted to rev the engine up to redline to see how smooth it was. I had the transmission in Park. The car would not rev past 4k! Is this normal or what?

Admittedly I haven't given it full throttle out on the roads yet (roads are still icy around here) but I think this sure doesn't sound normal.

Here is a video so you can hear the engine. The picture isn't that great because it was night time but you can make out the tach needle.

(Link to video removed, we know this is normal)

If its not normal, what do you think it is? Time for new plugs, wires, coils, etc?

Thanks for the time and help.

--Chris[/url]
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Old 03-11-2004, 08:02 PM   #2
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Revving the car in park or neutral is absolutely the worst thing you can possibly do. That'* why your PCM limits it to 4K, to protect the engine. Don't ever do that, even to 2k.
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Old 03-11-2004, 08:04 PM   #3
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Quote:
Originally Posted by willwren
Revving the car in park or neutral is absolutely the worst thing you can possibly do. That'* why your PCM limits it to 4K, to protect the engine. Don't ever do that, even to 2k.
Interesting! Is there a reason why? Does it hurt the emissions components? Transmission? Thanks for the heads up!
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Old 03-11-2004, 08:06 PM   #4
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Quote:
Originally Posted by CFoote
Quote:
Originally Posted by willwren
Revving the car in park or neutral is absolutely the worst thing you can possibly do. That'* why your PCM limits it to 4K, to protect the engine. Don't ever do that, even to 2k.
Interesting! Is there a reason why? Does it hurt the emissions components? Transmission? Thanks for the heads up!
Bad for the ENGINE. If it'* not under load, there'* no resistance. Things (like your valvetrain and pistons) are flying around in there.

This is a built in safety feature in the PCM programming, and it SHOULD be lower. Revving the car in Park or Neutral serves no purpose, and causes damage. If you're not driving and in gear, what'* the point?
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Old 03-11-2004, 08:26 PM   #5
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Quote:
Originally Posted by willwren
Bad for the ENGINE. If it'* not under load, there'* no resistance. Things (like your valvetrain and pistons) are flying around in there.

This is a built in safety feature in the PCM programming, and it SHOULD be lower. Revving the car in Park or Neutral serves no purpose, and causes damage. If you're not driving and in gear, what'* the point?
Gotcha, thanks. I didn't sit there and do it for a long time (maybe 4 or 5 times in the video?). Hopefully everything is OK. Thanks for the quick response Bill.
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Old 03-11-2004, 08:40 PM   #6
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Originally Posted by jr's3800
Its bad to rev the crapp out of an engine that is free wheeling or without load... Thats one of the reasons I'm sure GM put that rev limiter in there... A small tap of the gas won't hurt much... I think what it really does is this you will not get past 4000 rpms unless the car is going faster than a set speed... And 6000 will be the fuel cut off... If you hit the fuel cut oof than you are pushing too hard... You have no reason on earth to rev the engine to 6000 in park in the first place.... Don't rev it to 4000 rpms either.... Well if you'd like it to blow up soon go ahead and keep doing that...
Hahahaha no, don't worry, I don't do this at all with my cars. I did it tonight just to see if the engine was smooth (no backfires, wasn't vibrating, bad engine mounts, etc.). Now that I know the reason behind the rev limiter I won't do it at all.
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Old 03-11-2004, 10:23 PM   #7
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I remember when I bought my car to have it O.K'd by a mechanic, they reved it like that for 5 minutes strait! :o
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Old 03-11-2004, 11:05 PM   #8
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Yup that'* your limiter. And I agree it should be lower.

If you want to know what happenes when you rev to 6000rpms in P, ask my brother. He did it ALL the time in his 1990 Firebird, which he doesn't drive anymore.
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Old 03-11-2004, 11:21 PM   #9
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The limit is actuall under 25 MPH i think we determined a few months ago? Something like that. If it'* rev limted @ 4k it won't slow down to dead even 4k, it'll still run over, which is why it'* used over the factory limiter.

Why bill? Well with your magnaflow....
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Old 03-12-2004, 01:41 AM   #10
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Originally Posted by BonneMeMN
The limit is actuall under 25 MPH i think we determined a few months ago? Something like that. If it'* rev limted @ 4k it won't slow down to dead even 4k, it'll still run over, which is why it'* used over the factory limiter.

Why bill? Well with your magnaflow....
the limit is 15 MPH, if you rev the engine above 4k at >15 MPH and then slow down to 15 or less, the limit will kick in, repeat, the limit will kick in
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