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i have a 2004 GT. i bought it in 2007. well, i suppose my experience is similar to many. my car has almost 70,000 miles on it now (bought it with a hair over 31,000). as far as i can tell, the engine is just fine. however, i've had some issues over the years.
1. i had to replace my front main seal (and several alternator belts!).
2. my ignition coils crapped out on me causing the death of the cat, and somewhere in there i developed electrical issues. this was truly a nightmare, and i had my first occasion to interact with a Mazda dealer, an experience i found thoroughly off-putting. to be honest, i think they caused my electrical issues, the one that remains now is the car somehow thinks the passenger side door is always open.
3. i used to premix as well, but my fuel pump took objection to it.
all in all, i think the Renesis is a gem of an engine, but i think they should have taken more time developing the car around it. i also think they should have made it simpler because i have done 90% of the work the car needed, but i ended up having to pay someone to basically reset my PCM after the fiasco with the dealer. despite my issues, and the bad taste left in my mouth (after my dealership and MNAO experiences), most days i love the car. it is a joy to drive. there were times i felt trapped by it, and wished i had bought the 350Z instead, but i think i've come to accept all it's faults and i've resigned myself to live with it for a long time to come.
whenever the day comes for the engine to come out i will likely streetport it and give it a few reliability upgrades here and there and put it right back in there. however, i'm also thinking of maybe putting an N/A 20B in it, too. i guess we'll see ...
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