As far as I can tell mine hasn't been apart and has 226k on her and running great.

90hp of pure pleasure

80K

185k -- 98hp (It's an 88).

My 85 fiero (First car) I sold it with 173,000 and started to burn oil. My 88 Grand am (family car since 1990) has 156,000 cam gear replaced years ago not burning oil and running great. And finally 88 fiero 130,??? (no comment) as it has been back on the road only a month since I bought it a year ago. God knows I love the duke but the power is crap when they get old.

HP...? well the top speed in a car with a duke is about 75mph, you do the math.

Jim

[This message has been edited by FieroJimm (edited 12-23-2008).]

A little over 222,000 and still running good.

Now up to225,100 and still good.

[This message has been edited by johnt671 (edited 11-21-2009).]

I wish I knew. My 86 coupe came to me in several pieces. No engine or trans installed. Did have an 84 duke with unknown history available so I took it and made it work. Has run real good for the 23k I put on it in the last 2 years. Car now has 143K on it

Mine was at 190,000 as still going before I swapped in the L67 in my 86. My 85 is at 150,00 I'm not sure if she still runs though, I overheated it and never tried it again.

Fellas,
Damn Duke, it keeps on running, no smoke, still has compression with over 225,000 in its bones. What's that it dog years? Why does it keep running? I have no idea, maybe I don't run it hard. Damn Duke, I wish it would die so I can move on

Cordially,
Kevin

[This message has been edited by kevin (edited 12-23-2008).]

While I dont have a 4cyl Fiero...I had an 85 Buick Regal Sommerset with a duke in it and even when i got T-boned and totaled it it still ran at 387000km (240000miles)

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Romeoliquorstore.com
Myspace

How about our ''84 with 13,000 ?

'86 Duke Coupe with almost 72K on it. Still all original except for the distributor and normal maintenance.

Edit to add: I have had the needle go past the 85 MPH on the speedo a few times so how fast is that?

Update: Just turned 76K miles!

[This message has been edited by Trekker (edited 08-19-2011).]

all 84s:
65000 approx. (Indy)
118,000 approx (Indy)
116,000 approx (SE)

All original engines except for the 118,00 mile Indy, which (as I understand it) had a GM Goodwrench eng replacement during the recall. It has the Goodwrench replacement engine decal on the valvecover.

quote Originally posted by FieroJimm: HP...? well the top speed in a car with a duke is about 75mph, you do the math. Jim

If you can't do at least 100, there's something seriously wrong with the engine.

had an 89 Grand Am w/ a Tech 4 in high school and thru college. it ended up with 266,XXX miles on it before the tranny died on it. only did regular maintenance to it except for a valve cover gasket (as far as the motor goes). still wished i had that car. when the trans went on it the body was so far gone (as well as the frame) that i just crushed the thing. that thing was a beast, nothing could kill it

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1986 Fiero GT
2000 Chevrolet Blazer ZR2
2004 Saturn Ion '2'

" I guess I've learned that there's more to life than racing, but not much more."
-Paul Menard

[This message has been edited by fastblack (edited 12-24-2008).]

quote Originally posted by KurtAKX: If you can't do at least 100, there's something seriously wrong with the engine.

I think the auto tranny would have a hard time reaching those speeds, but i'm not sure. Its been far too long since I had my 3 speed.....

85 se with 152,000 on the clock and no sign of stopping her I myself have put 50,000 in a little over a year on it. Btw stock duke fiero's will do a lot more than 75. I have personally had the speedo needle past the left side of the trip meter on a few occasions. I have no idea how fast i was going but it felt great.

I am not calling anyone a liar but I am seriously suspicious that any duke could go 100K, let alone 200K without needing a cylinder head. I suppose it's possible with a very conscientious owner. I'm not even going to talk about quad 4s. lol

I did a fresh overhaul last two years back, I now have about 10K on this fresh engine and clutch. The engine that came in the car had 81K and # 1 rod threw the block.
Joe Crawford

quote Originally posted by FieroBrad87: I am not calling anyone a liar but I am seriously suspicious that any duke could go 100K, let alone 200K without needing a cylinder head. I suppose it's possible with a very conscientious owner. I'm not even going to talk about quad 4s. lol

Hmm, not sure how to respond to this. The one duke powered Fiero I have is all original, the clock shows 115K + and is still going strong. I got the car with 80 k on it and have no reason to suspect the motor was ever pulled. 100 k miles for that motor should be expected IMO. I don't expect to do much more than oil and filter changes for a very long time. Won't surprise me to see 200 k but then, I take care of my engines. These are old cars, I suspect you've seen some that didn't get the preventive maintenance that was needed.

Ron

quote Originally posted by blackrams: Hmm, not sure how to respond to this. The one duke powered Fiero I have is all original, the clock shows 115K + and is still going strong. I got the car with 80 k on it and have no reason to suspect the motor was ever pulled. 100 k miles for that motor should be expected IMO. I don't expect to do much more than oil and filter changes for a very long time. Won't surprise me to see 200 k but then, I take care of my engines. These are old cars, I suspect you've seen some that didn't get the preventive maintenance that was needed. Ron

No, I understand. I'm not trying to start a fight. I'm just saying that both of my dukes needed heads at least once between 100K and 150K. IMO the only good duke head is one that has been welded back together. BTW I never said anything about "pulling the motor". There is certainly no need to pull a duke to do the head.

quote Originally posted by fastblack: had an 89 Grand Am w/ a Tech 4 in high school and thru college. it ended up with 266,XXX miles on it before the tranny died on it. only did regular maintenance to it except for a valve cover gasket (as far as the motor goes). still wished i had that car. when the trans went on it the body was so far gone (as well as the frame) that i just crushed the thing. that thing was a beast, nothing could kill it

I had a 1990 Grand Am with the 2.5 and when I retired it to a friend as a field beater it had 330k on it, it was a 5 speed to the trans never died. It was opened up once because I happened to get both front wheels in huge potholes in a parking lot, thus ramming the oil pan onto a ridge of blacktop, ripping open the goofy inner oil filter housing and damaging the rear main seal. That happened at 90k, after that was fixed no probs. Like yours the body rusted off, I had a computer issue but once replaced with a junkyard one took care of that.
I swore I would find another low milage one without rust but could not find one.

It really didn't use much oil either.
*edit* original head the whole time, bought the car with 60k on it.

My Fiero's duke doesn't use 10w30 at all either.

[This message has been edited by 2.5 (edited 12-24-2008).]

Boy, I am a different breed of Fiero people. I've always known better than to drive a piece of crap like a grand am, and that's saying a lot because I was driving Fieros. But I'm also of the "anti-4.9/anti-3.4DOHC/Quad-4" crowd... Call me a GM purist

[This message has been edited by FieroBrad87 (edited 12-24-2008).]

When a car is loyal to me, I am loyal back.

quote Originally posted by FieroBrad87: I am not calling anyone a liar but I am seriously suspicious that any duke could go 100K, let alone 200K without needing a cylinder head. I suppose it's possible with a very conscientious owner. I'm not even going to talk about quad 4s. lol

Hmmm......I bought my '86 2m4 from the original owner. The clock has 238,XXX on the dial but doesn't register any more. So I know it's more than that. I did have to replace the head gasket when I got it though.

quote Originally posted by FieroBrad87: I am not calling anyone a liar but I am seriously suspicious that any duke could go 100K, let alone 200K without needing a cylinder head. I suppose it's possible with a very conscientious owner. I'm not even going to talk about quad 4s. lol

the tech 4 in my GA was different than one i had in an 86 olds...the GA had the oil filter inside the pan and ran like a champ as i said. the olds had the oil filter mounted upside down near the top of the motor...that one cracked the head at 86,000. i thought it to be strange myself and replaced the whole motor with one like in my GA. couldn't tell ya how far that one went, my sister totaled the car and we crushed it...

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1986 Fiero GT
2000 Chevrolet Blazer ZR2
2004 Saturn Ion '2'

" I guess I've learned that there's more to life than racing, but not much more."
-Paul Menard

59,xxx

quote Originally posted by FieroBrad87: I am not calling anyone a liar but I am seriously suspicious that any duke could go 100K, let alone 200K without needing a cylinder head. I suppose it's possible with a very conscientious owner. I'm not even going to talk about quad 4s. lol

Not all dukes are the same. They gradually improved over the years. Not just in strength of parts, but in manufacturing tolerances also. Did you know that before about 1987, the factory kept 4 sizes of pistons in stock, so that they would have ones that would fit each block as it came from being manufactured? The tolerances were so bad that they needed 4 sizes to ensure a fit within spec. By 1987, the manufacturing tolerances had improved to the point that they didn't have to do that.
ps. I'll let you know when my 88 duke turns 200k miles. It's over 185k now.

130k on mine. except for a leaking vac diaphragm, runs great.

quote Originally posted by pswayne: Not all dukes are the same. They gradually improved over the years. Not just in strength of parts, but in manufacturing tolerances also. Did you know that before about 1987, the factory kept 4 sizes of pistons in stock, so that they would have ones that would fit each block as it came from being manufactured? The tolerances were so bad that they needed 4 sizes to ensure a fit within spec. By 1987, the manufacturing tolerances had improved to the point that they didn't have to do that. ps. I'll let you know when my 88 duke turns 200k miles. It's over 185k now.

Wow, I got quite lucky with my 86!

87 2.5 auto
127K and no problems.

runs great.

My 1987 Duke only has 79 actual miles on it....YES 000079.9 odometer reads. Still has factory oil filter on it...Ive owned it for 6 years never heard it run. Im preserving it as factory delivered,,[still has window sticker on it and plastic on interior. I know cars are meant to be driven,but at least one Fiero will always be NEW!!! Ed

My '88 has 123,000 miles on it. Runs really well... still!

My brothers 86 has 170,000 on it and still runs great. there has never been any work done to it other than the normal oil change and tune ups.

My indy has 152,000 on it as well and still going

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Indy#64~FieroNews~Boots~Bag s~Wallets~Headliner~Spare Cover~
Visors~Sunshads and T-Top Sunshades~Download the Fieronews Catalog HERE~

Mine has 134000 miles on the clock. I don't know if the engine is original or not.

I'm enjoying reading all these posts about how reliable the Duke can be. I think that's totally cool. And I'm a big fan of driving slow cars fast, rather than fast cars slow. So the 98hp is no big deal to me.

Cheers!

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Spent my days with a woman unkind Smoked my stuff and drank all my wine...

Lets see my 88 just went over 100,000 recently. It is sitting at 101,500 approximately. And the only things I have done to is is replace the tensions pulley assembly and the clutch. The rest of the engine is original.

my '87 auto has 126K miles on it. Engine has never been opened (and I'm the original owner).

quote Originally posted by ED77KATR: My 1987 Duke only has 79 actual miles on it....YES 000079.9 odometer reads. Still has factory oil filter on it...Ive owned it for 6 years never heard it run. Im preserving it as factory delivered,,[still has window sticker on it and plastic on interior. I know cars are meant to be driven,but at least one Fiero will always be NEW!!! Ed

Thats crazy, have any pictures to share?

quote Originally posted by ED77KATR: My 1987 Duke only has 79 actual miles on it....YES 000079.9 odometer reads. Still has factory oil filter on it...Ive owned it for 6 years never heard it run. Im preserving it as factory delivered,,[still has window sticker on it and plastic on interior. I know cars are meant to be driven,but at least one Fiero will always be NEW!!! Ed

Pics???

also plez tell me thats a five speed?
it sounds sooooo awesome!

178,000k on an 88 duke automatic. Won't say it's going strong, but it does a 35 mile round trip commute 6 days a week without complaining. The head was rebuilt around 125k, but didn't really need it... it just made me feel better It sees 80-85mph everyday, so saying 75 is the limit is certainly not true... and it's been over 100mph on a few occasions with the auto so that is possible too (it might have taken 5 miles to gather that speed, but it was perfectly happy once it got there).