2 Engine problems. - 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 04-20-2006, 12:58 AM   #1
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Default 2 Engine problems.

This is my first post in a long time so bare w/ me.

1) ENGINE RATTLE-- My engine makes a rattleing sound only under higher rev. Around 2700-RPM. It only does this under accelleration. Other posts note similar problems, but most of them have rattle all of the time. Another thing...It sounds like it is coming more from the bottom of the engine compartment. I have a rebuilt tranny, so I hope it is not that.

2) HESITATION-- Again I have seen similar posts, but the details seem different. When I get in the car and start it cold. It starts fine. But when I go to pull out of my driveway or work. Anywhere that I need to accellerate pretty quickly. The car hesitates and sort of stalls. It doesn't turn off. After a few seconds of this it will come back and go like normal. The Engine will rev and then bog down. It really only does this if the engine
hasn't been run a few hours.

PLEASE HELP...or refer me to a relevent post. Thanks.
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Old 04-20-2006, 01:54 AM   #2
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Check for loose heatshields, splash guard, etc.


I'm sure you've seen the posts, but try cleaning your MAF, check for vac leaks, and if you haven't already or within the last 10k miles, replace your fuel filter. Those are just some basic things to start with.
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Old 04-20-2006, 10:38 AM   #3
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You've got the same thing as MooseGundr.
As I told him:

"Happens on accelleration. Check.
Sounds like metal rattling, like tin cans. Check.
Causes stumble or hesitation. Check.
Sound comes from underneath car. Check.

If I were betting cash money, I'd guess plugged catalytic converter. Just take it to an exhaust shop, they can check it out pretty quickly."

We had the exact same thing last fall on my wife'* 2001 Grand Prix GT. Plugged Cat. Best part, there'* a law that makes GM pay for the whole thing if you have under 100,000 miles (in California, at least). If over 100,000 miles, just pay for it and get it done.

But seriously, you can stop troubleshooting it at this point and just take it to an exhaust shop.
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Old 04-24-2006, 11:24 AM   #4
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And let us know how everything turns out.
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Old 04-24-2006, 11:27 AM   #5
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Echo SSEi and Moose crawled under the car this weekend. I hear the cat isn't rattling and they need more time to get a better understanding.

You may want to check the Harmonic Balancer on the rattle issue.
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Old 04-24-2006, 12:49 PM   #6
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Harmonic Balancer will rattle at idle and go away as you accelerate.

Find out if you can duplicate it in your driveway while you watch under the hood. Pay attention to your AC compressor clutch/pulley. Is the sound any different when the AC is on or off? Are your belt(*) and idler(*) jumping or moving?

Do this in neutral to 3000 rpms, then again in gear with the parking brake set and 'power brake' it to the same 3000. Any difference? Or is it only when driving?

If it'* only when driving and not AC dependent, get under the car and inspect the front swaybar endlinks for play.
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Old 04-24-2006, 01:56 PM   #7
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On the hesetation.
Have you done a standard tune up and cleaned the throttle body, changed PCV, and filters along with fuel injector cleaner?
This is the logical start.
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Old 04-25-2006, 01:45 AM   #8
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I'm feelin' a bad cat.
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Old 04-25-2006, 09:12 AM   #9
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Quote:
Originally Posted by CSFiend
I'm feelin' a bad cat.
I'm not feeling this. A typical cat will act up when the car is up to temp, not cold. Let'* try and diagnose the problems instead of tossing out guesses. I wouldn't want to see this person spend $150 or so on a new cat w/o diagnosing and merit.
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Old 04-25-2006, 11:54 AM   #10
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I'm not suggesting he throw parts at it, I'm agreeing with previous posts, which also suggest verifying the concern before continuing with repairs. The only other thing that i've seen cause rattling around 3K are bad rod bearings. But that doesn't agree with the hesitation.

When my cat failed, I couldn't rev it above 3K, even in park/neutral. It rattled. It bogged. It did this all the time, not just when it was at a temperature extreme.
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