New member and I hate my car

jeudi 28 mai 2015

Hi all!

New as in new poster, but I've been following the forum for a couple of months. I know there are a lot of answered questions around here that are about the same as mine, but I don't really have the time (4 kids, 2 cats, 1 dog, an old house and a girlfriend that takes more of my time than all of those other things toghether!), and the knowledge/experience to go too deep into my car engine.

I got a good price on an US-imported (I live in Sweden) RX8 7-8 months ago. I knew the car was running bad but decided to give it a shot as the car was in good condition otherwise (stupid choice but it seemed good at the time). The previous owner told me he had exchanged the engine a couple of years back, but according to him the car was running perfect until he had the front resprayed. After the respray the car was was next to impossible to drive at all, and he said the mechanics who did the respray claim they have nothing to do with it.

Anyways, I took it to my mechanic, turns out the catalytic converter was jammed of old exhaust residues (whatever the respray had to do with that...) and I ordered a new one. After replacing it, the car was finally drivable, but nowhere close to what it's supposed to be like. I changed the spark plugs, the (front, I think) lambda sensor after an OBD-reading claiming it was broken. The car got better and better, but still not perfect. I'd say it feels like it has around 130-150hp instead of the ~238 it's supposed to have. On idle, the car was at 1500 rpm instead of 800, and when the engine got warm (like after driving for a while) it would usually die when stopping the car instead of idling at 800rpm. I still got a bad reading from the front lambda, so I thought it could be the MAF that was broken. Tried cleaning it without success so I bought a new one that arrived today.

It's just a little better, but it still runs like s-it. When revving up from idle, the car goes up-down-up-down-up-down and then finally up before I can drive. As long as I keep it above ~3000rpm it runs fine (but with lacking power). The idle however now stays at around 800 rpm instead of the previous 1500. I just don't know where to go from here...

Another thing that could be of interest, the previous owner had the air filter changed into a K&N which I've heard perhaps isn't the best choice for this car, but I don't have the original air filter box so I can't try to change it back. I've found some sensors of some kind within the engine compartment that I have no clue whatsoever what they're good for, but it looks as if they've been connected. I bought some tube and connected them, but the car runs even worse when connected. Pressing down the gas pedal fully at idle kills the car completely. See the attached pictures.

Please help me if you have any ideas :(. At the moment it's just standing unused in my garden (even though it's looking good).

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