Question about 1985 Pontiac Fiero

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Not Sure What Engine to Replace Iron Duke in Fiero

Hello I need some advice on what my options are for replacing a knocking 2.5 L (VIN code: R) in a 1985 Fiero Sport. It has the 5-speed transmission. This will be a daily driver. I enjoy driving the car, except for nearly getting run over due to poor acceleration.

Reliability and fuel economy are still important to me so I would was thinking of sticking with a 4 cyl, but as long as I’m going to the trouble of replacing the engine, I would like to get better acceleration/performance, if I can afford it. (I also plan to upgrade the breaks and suspension eventually.) I’m not going to be street racing or anything, I just want to be able to keep up with most cars on the road.

One concern I have is with putting back another Iron Duke…I like the idea of getting something more modern and efficient and even slightly lighter, but I suspect it would cost more and require a different cradle, wiring, ECM, and maybe a different transmission. Is there a more modern 4-cyl that would bolt directly in that would be better? Or would an Iron Duke that been rebuilt with better rods, maybe a performance crank/cam, etc be a good idea? I'm open to upgrading to a 6 cyl, but I want decent fuel economy.

I’d like to know what the best options are and generally the pros and cons of each. Thanks.

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  • email_4ben Dec 11, 2008

    Can you tell me what you mean by re-design? Are you referring to the engine cradle and mounts? Just wondering what all would be involved. Thanks.

  • yadayada
    yadayada May 11, 2010

    No other engine will fit unless you re-design the engine bay.

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I don't know if you listened to the insane person who previously answered but in a fiero w/o any mods you can bolt in a 3.4 V6 (1992-1995 Camaro/Firebird) or a 4.9 Cadillac V8, four cylinders I'm fuzzy on but I think cavaliers, corsicas etc. engines bolt in, you can do an ecotech but it requires ***loads of work. There is always the Northstar or 350 V8 option ;-] The point is, with a fiero, any engine can go in, just amounts to hours and dollars...

Posted on Mar 26, 2009

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If its low octane gas use high test. if its a rod knock and still runs you my need rod berings

Posted on Mar 01, 2009

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You say fuel economy and indicate cost is a concern. I recommend staying with either a good used 4 cyl like you have now or if you can afford to buy a re-built or have your own rebuilt then that may be the best choice with the least hidden costs. If you upgrade to a 6 cyl then the transmission will likely have to be changed, plus there are lots of hidden costs you won't find out about till half way through.

Posted on May 26, 2009

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