3rd Gen / L98 Engine Tech 1982 - 1992 Engine Related

Thinking about buying a '91 3.1 V6, need some help

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Old Oct 8, 2005 | 01:47 PM
  #16  
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Re: Thinking about buying a '91 3.1 V6, need some help

Thanks for clearing that up for me. Fixing a broken motor mount won't cost but like $80? So if it is indeed a broken motor mount it's not that big of a deal to me... I could probably look at the wires and vaccum line myself, right? I'm far from being a mechanic but I have helped someone change the plugs and wires on their car so I know a little something about it. Where exactly is the vaccum line located at?
Old Oct 8, 2005 | 07:17 PM
  #17  
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Re: Thinking about buying a '91 3.1 V6, need some help

Motor mounts should be cheap. Vaccuum lines are all over the place. Pretty much any tube that comes off of the intake is a vaccuum line. If any of them are leaking you will get an incorrect air/fuel ratio. If it is indeed a misfire, lots of things can cause it. Bad spark plugs, bad or incorrectly positioned plug wires, bad fuel injectors, compression loss on a cylinder, and probably other things I am not thinking of. I would say buy it for $1000 and have fun fixing it. Worst case scenario is that buy a junker but you learn a lot in the process.
Old Oct 8, 2005 | 08:15 PM
  #18  
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Re: Thinking about buying a '91 3.1 V6, need some help

Compression loss on a cylinder = loss power???

I know the V6s aren't fast at all, but my sisters '94 Thunderbird V6 seems a lot than this and hers is the 3.6l 140hp.

Hell, maybe the screwed the motor up while they were putting it back together and now are just trying to get rid of it. I guess that's the bad thing nowadays, you don't know who you can trust. The lady does seem like an honest person, she let me go test drive it while she was in work. For all she knew I could of stolen it or ragged on it and she'd never knew.... But then again, maybe she doesn't give a crap because it's really a POS lol
Old Oct 8, 2005 | 09:14 PM
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Re: Thinking about buying a '91 3.1 V6, need some help

I don't know man. I just did a search on autotrader.com for camaros under $1500 within 100 miles from my house and found a stack. v-6 fourth gens, and not too bad 3rd gens both v6 and 8. I say keep looking...... Ihave bought 3 cars off autotrader in the last 4 or 5 years and only disappointed by one that was actually through a dealer and ended up being a lemon. That only cost me like $4000 between the transmission and being upside down at trade in 11 months later..... The used private individual sales on my 91 RS and then my current GTA have been great!
Old Oct 8, 2005 | 11:19 PM
  #20  
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Re: Thinking about buying a '91 3.1 V6, need some help

I Agree With Kwik On This One, Sounds Like This Car Is A Pos!! I've Been A Car Dealer For The Last 12 Years, So I'm Speaking From A Experience. Keep Looking Around And You'll Find Something A Little Better To Start With Than This Car. If You Live In South Texas I Have A 92 Firebird 305 4bbl, Auto, And A/c I'll Sell You For $1200, Mechanically Sound, But Needs A Little Body Work Here And There, But A Great First F-body!!!!!
Good Luck
Benny
Old Oct 8, 2005 | 11:27 PM
  #21  
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Re: Thinking about buying a '91 3.1 V6, need some help

Ok, if you check the motor mounts and do find a broken one, and fix it yourself, it will cost you no more than about 30 bucks tops. I know aftermarket mounts arn't expensive at all. It's really difficult to say much about what this rough idle can be. You have to just start with basics. Visual checks in other words. Verify the plug wires are in good condition, I.E. no burnt areas from laying against exhaust manifolds, no tears in the insualtion, and check that they are all in the right spot on the coil pack and spark plugs. I have had a couple plug wires on my camaro crossed before, and it would idle rough and seem fine under acceleration. I quickly found my problem by checking basics. If the plug wires appear ok, check out the vacuum lines. You asked me what the vacuum lines were. I can't tell you exact locations, cause it's been sometime since I got rid of my 89 RS with a 6 cylinder, but as on any engine, they are the black rubber lines you see everywhere. Just look under the hood or on the radiator support for the sticker that says vacuum routing diagram. Hopefully it's still there. Some of them arn't vacuum lines. Easy way to tell is pop a line off from an end, and put your finger on that end. See if you feel it pull on your finger a little bit. A change in idle will occur as well. It also wouldn't hurt to verify your fuel pressure since it's an easy and effective way to be sure your fuel pump is in check, and that no restrictions are in the fuel lines. Simply buy a cheap fuel pressure gauge from autozone or a parts store, and hook it up to the schrader valve on the engines fuel rial. It will look like a small valve cap that screws off providing the cap remains on it. If the cap aint there then it will just look like an overgrown valve steam opening from a tire. Turn the key in the on position and watch the gauge. It should quickly build up pressure to around the high 30's psi. Start the car and watch it while opening the throttle various times. The pressure should increase some to just under 50psi under heavy throttle. If all this checks out ok, then it's not a fuel pump or fuel filter problem. All this would leave for the fuel system is a faulty injector or two. You can also check for resistance in each injector, but we will get into that if everything else checks out first. Good luck again.
Old Oct 8, 2005 | 11:31 PM
  #22  
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Re: Thinking about buying a '91 3.1 V6, need some help

And as a side note, I must agree and say take a day or two more and shop around. Don't let yourself fall in love with the first one you see. I made that mistake before and regret it. I wanted the first cool car I saw no matter what it looked like. lol. Good luck.
Old Oct 8, 2005 | 11:52 PM
  #23  
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Re: Thinking about buying a '91 3.1 V6, need some help

I just did a search on Autotrader and didn't find a single Camaro for under $1500 within 75 miles of my house. Maybe it's just the area I live in, but to find a third gen for sale is very hard to fine, and fine one that actually still runs good is more harder to find. Mechanical this car has a lot of new parts on it and I've seen the receipts for it all.

Not many cars you can find that is perfect for $1000 so I've already accepted that this might be a POS. I'd rather have a POS that I want and want to fix up. I had a chance to buy a '92 Dodge Colt hatchback for the same price, but why would I want something that looks like a Geo Metro when I can have a Camaro and paint it to look nice. This will be good enough for a year or two until I can buy a better car, after all this is my first car ever of my own.

Tomorrow I do plan to take it on a longer test drive and go on the interstate to see how it is at higher speeds.

Thanks for all the help guys, I'll tell you guys how it went tomorrow afternoon when I get back.
Old Oct 9, 2005 | 12:09 AM
  #24  
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Re: Thinking about buying a '91 3.1 V6, need some help

Where do you live? I found 5 within 25 miles of my house. Look on ebay. I am not trying to talk you out of this car, but if there are unknown issues, you should keep looking if you can. Motor mount is cheap, but it is not a 10 minute fix for a rookie. You have to unbolt and jack the motor up. Find out the oil pan is junk, and it becomes a nightmare....

If You Live In South Texas I Have A 92 Firebird 305 4bbl, Auto, And A/c I'll Sell You For $1200, Mechanically Sound, But Needs A Little Body Work Here And There, But A Great First F-body!!!!!

Might be worth a couple hour drive.

Good luck in your search, or hopefully the test drive shows a good car!
Old Oct 9, 2005 | 12:29 AM
  #25  
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Re: Thinking about buying a '91 3.1 V6, need some help

I live in Richmond, VA. Well I take that back, I found one within 75 miles http://autotrader.com/fyc/searchresu...111&x=110&y=10
Old Oct 9, 2005 | 09:14 AM
  #26  
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Re: Thinking about buying a '91 3.1 V6, need some help

Originally Posted by Immortal
I live in Richmond, VA. Well I take that back, I found one within 75 miles http://autotrader.com/fyc/searchresu...111&x=110&y=10
I would listen to some of these guys as well, take your time, look at a few more cars. I picked up my old 88 Formula with a 305TPI and a five speed manual for 1200.00 so there is stuff out there.
Old Oct 9, 2005 | 10:05 AM
  #27  
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Re: Thinking about buying a '91 3.1 V6, need some help

Originally Posted by Immortal
Compression loss on a cylinder = loss power???

I know the V6s aren't fast at all, but my sisters '94 Thunderbird V6 seems a lot than this and hers is the 3.6l 140hp.

Hell, maybe the screwed the motor up while they were putting it back together and now are just trying to get rid of it. I guess that's the bad thing nowadays, you don't know who you can trust. The lady does seem like an honest person, she let me go test drive it while she was in work. For all she knew I could of stolen it or ragged on it and she'd never knew.... But then again, maybe she doesn't give a crap because it's really a POS lol
But honestly she doesnt care if you steal it, then she gets to file a nice insurance claim on a 1 grand car. Watch out people will **** you over now a days, they may seem nice but everyone has hidden objectives in the car world. Here what I would do to tell if the engine is in good condition. Have someone sit outside of the car. Have you drive by them and as you get to them floor it and have them watch for any smoke or anything which comes out the tailpipes. Any smoke means **** motor or new valve seals either way it wasnt rebuilt.

All in all the safest thing to do it pat the 50-100$ bucks to take it to a mechanic and have them check it out. Ask the lady if you can take it to a mechanic and she better agree otherwise get the hell out of there. I took my car to a mechanic (93 formula) because the last car I bought,mustang, I got screwed on. Trust me it is well worth it, you dont want to end up w/ a 1grand paper weight. Especially since they coulda put anything in that oil/trans to make any problems go away temporarily.
Old Oct 9, 2005 | 11:44 AM
  #28  
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Re: Thinking about buying a '91 3.1 V6, need some help

Well I know most of you will disagree with it, but I decided to buy it anyway.. Maybe it's a mistake, but I took that risk. After test driving it today longer it just felt right for me. So far I love the car, I'm so happy with it.

Since there's bigger rear tires in the back the speed odometer is off, so that explains why it looked like I was going slow.. When I was on the interesate on the way home the person I rode with on the way up there was following me back and he was going 70mph and I was beside him doing about 60mph and was staying with him
Old Oct 9, 2005 | 12:26 PM
  #29  
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Re: Thinking about buying a '91 3.1 V6, need some help

Well, congrats. and good luck with your new f-body. People on this board are very knowledgeable and willing to help you out so dont hesitate to ask questions.
Old Oct 9, 2005 | 12:27 PM
  #30  
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Re: Thinking about buying a '91 3.1 V6, need some help

Well seing you got it first thing I would do is change the oil. Find a place near you that can take a sample and let you know what they find in it.
Next find someone with a compression guage that dont mind reading what the cylinders are doing.
Or you can buy one at the auto parts store and get new plugs same time. When the plugs are out of the cylinders (be sure to mark each plug wire where they came from) and screw the guage into the plug hole. Now turn car over a few times.
It will let you know the status on the motor's compression.

Good Luck. As far as price not bad but that primer paint will rust get it painted soon or watch it rust.



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