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What's wrong with my Monte Carlo? Rather bizarre one-time incident... Rate Topic: -----

#1 User is offline   Silent-7 

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Posted 08 November 2009 - 07:21 PM

OK, so I have every intention of taking my car in to get looked at. But until I have time for that, I figured it couldn't hurt to ask for some help in here since I know we have some car guys on the SO forum.

I drive a 1997 Chevrolet Monte Carlo Z34 coupe with the 3.4 Liter V6. About a week ago I started it up, and it immediately starting making an awful banging noise, at a rate of 3 or 4 per second, accompanied by a minor-but-noticeable rocking of the car back and forth. My first reaction was that it was going to die on me, so I gave it just a little gas. This really had no effect. I waited a few more seconds to see if anything would happen, and noticed that both the "check engine" and "change oil soon" lights were on. Nothing really changed so I was about to shut it off, when the banging suddenly stopped. I waited a bit more, gave it a little gas and so on; it seemed to be running normally, and the "check engine" light had turned off. I decided to drive it (I was only going about five minutes away) and it ran completely normally. If it weren't for the "change oil soon" light still being on, I wouldn't have been able to tell anything had happened.

I took a peek under the hood, but I really don't know what I'm looking at. (There wasn't any blood or fur in the belts. ;) ) The oil was changed less than 3000 miles ago, but I still haven't gotten around to pulling the dipstick and seeing if it's somehow low. I've driven it a few times since - it still runs perfectly fine, but the "change oil soon" light is still on. So I'm sort of at a loss.

Any help you can give me would be much appreciated!
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#2 User is offline   CamoDeafie 

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Posted 08 November 2009 - 07:32 PM

the 3.4 Liter v6....is it the LQ1 DOHC 60 degree GM V6 or the 3400 OHV pushrod 60 degree v6?

either way, look through this page 60 degree v6 forum and see which oine you have, it sounds as if your valves are impacting the pistons, BUT I cannot be sure, if it is the 3400 pushrod v6, or the LQ1 DOHC 3.4 V6....since both have quite a bit of different things....
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#3 User is offline   C0N0R 

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Posted 08 November 2009 - 07:33 PM

im no engine expert, but if its at a regular interval like that, could it be detonation in one of the pistons?
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#4 User is offline   Flippy the Wonder Bunny 

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Posted 08 November 2009 - 07:53 PM

This happens more than you'd think, and is pretty easy to diagnose. The magic elves that make your car work are fighting under your hood. I suggest you sacrifice a lamb to them and put some of it's blood on your engine while it's running. Then put a tiny piece of the meat in the gas tank. It's a pretty simple fix.
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#5 User is offline   H3 Proto 

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Posted 08 November 2009 - 08:07 PM

Look in your gas tank, that's probably where the problem lies. But it's dark in there, so light a match to illuminate it.

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#6 User is offline   Flippy the Wonder Bunny 

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Posted 08 November 2009 - 08:11 PM

You might get warned for that one, brah.
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#7 User is offline   I.K.E. 

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Posted 08 November 2009 - 08:18 PM

View PostCamoDeafie, on Nov 8 2009, 08:32 PM, said:

the 3.4 Liter v6....is it the LQ1 DOHC 60 degree GM V6 or the 3400 OHV pushrod 60 degree v6?

either way, look through this page 60 degree v6 forum and see which oine you have, it sounds as if your valves are impacting the pistons, BUT I cannot be sure, if it is the 3400 pushrod v6, or the LQ1 DOHC 3.4 V6....since both have quite a bit of different things....



View PostC0N0R, on Nov 8 2009, 08:33 PM, said:

im no engine expert, but if its at a regular interval like that, could it be detonation in one of the pistons?


Could be a misfire in one of the pistons. Take the dang thing to AutoZone, or even O'Reilly's, and have them hook it up to the code reader. Chances are the code is still in the computer and you can get some idea of where the trouble occurred.
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#8 User is offline   Silent-7 

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Posted 08 November 2009 - 09:55 PM

View PostH3 Proto, on Nov 8 2009, 09:07 PM, said:

Look in your gas tank, that's probably where the problem lies. But it's dark in there, so light a match to illuminate it.

I am not responsible for any injuries sustained.

Tried this. My car is a heap of charred metal and I'm writing this from the hospital. Thanks a lot. :dodgy: :dodgy:


View PostCamoDeafie, on Nov 8 2009, 08:32 PM, said:

the 3.4 Liter v6....is it the LQ1 DOHC 60 degree GM V6 or the 3400 OHV pushrod 60 degree v6?

either way, look through this page 60 degree v6 forum and see which oine you have, it sounds as if your valves are impacting the pistons, BUT I cannot be sure, if it is the 3400 pushrod v6, or the LQ1 DOHC 3.4 V6....since both have quite a bit of different things....

How exactly do I figure out what I have from there? I browsed around and did a few searches and what not, but I'm missing it. Could I figure this stuff out from the owner's manual? Sorry, I'm clueless about this stuff.


View PostI.K.E., on Nov 8 2009, 09:18 PM, said:

Could be a misfire in one of the pistons. Take the dang thing to AutoZone, or even O'Reilly's, and have them hook it up to the code reader. Chances are the code is still in the computer and you can get some idea of where the trouble occurred.

I definitely plan to (though I'm at college in a small town, and my choices are limited...). But I figured I'd see what information I could get in the mean time - at the very least whether or not I should be driving it even though it seems fine.
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#9 User is offline   CamoDeafie 

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Posted 08 November 2009 - 10:01 PM

look at the SPID label on the spare tire cover's underside, if it says LQ1, then you have a DOHC 3.4 v6, if it says otherwise, you have the 3400...should be fairly easy to find out, just go to the link i provided, that particular forum is all about the 60 degree GM v6s, both pushrods and DOHC...simply put, if your valve covers look HUGE comparerd to everyone else's cars....then you probably have a DOHC...it shoudl also say DOHC or something somewhere on the engine cover..
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#10 User is offline   Silent-7 

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Posted 08 November 2009 - 10:29 PM

Alright, I popped the hood again and it says DOHC.
What does that tell us?

Also, I checked the oil. The level is almost exactly at the full line, and the oil itself looks totally fine to me. So I don't know why the oil light is on all the time... :dodgy:

This post has been edited by Silent-7: 08 November 2009 - 11:23 PM

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