Hello, first i would like to say that i've been lurking and learning about the RX-8 for a long time on this website, i never needed to make an account since most issues that have came up were fixed with a quick search but now i've hit a brick wall.
BACK STORY: A few weeks back me and my dad bought a 2004 Rx8, 4 speed auto, 127k miles, the engine was overheated and burned out by the previous owner. from the looks of it, the car hadn't been started for a long while when we got it. The engine would spin but wouldnt turn on.
WHAT WE TRIED: We bought a new engine that came out of a running car with 50k miles. it was from a 2004 manual 5 speed. we swapped the old engine with the new one, but kept the old wiring, old computer, and old transmission. as well as everything else not pertaining to the main engine. it also has the updated N3Z2 starter from the old engine.
We changed the oil, tranny oil, added gas (since the old one was probably no good), new oil filter, reset ESS (aka 20 brake pumps) , checked and cleaned the ESS sensor, Checked and cleaned MAF sensor and made sure to keep the battery charged at all times. We also checked the spark plugs, coils, and wires in the new engine and they looked clean. we bought a new radiator but haven't yet installed it.
CURRENTLY: Today we went and cleaned up the engine and tried to crank it. The first couple of times we tried it just spun over and over. Eventually after a while of trying we got it to crank (had to give it gas while cranking). At first it would only stay on if i was giving it gas, a lot of white smoke came out and i let go of the gas after about a minute and it stayed on like that (everything sounded normal) for about 5 minutes, after that i tried to rev it up to 2,500 but my foot slipped slightly and the revs dropped and caused the engine to die (this is where i'm stuck) engine temperature was at about half way in the gauge.
We tried turning it back on a bit later but it went back to just spinning over. after fiddlying around with the car we noticed a cable was unplugged at the transmission (we have no idea where it goes, ill try to get a picture soon so you can help) my dad said it shouldnt have anything to do with the engine so we tried turning it on again and it finally did (took about 10 seconds of cranking while giving it gas, as well as a battery charger connected to the battery and some starter fluid) some more white smoke came out but a lot less than the first time. I kept my foot on the gas and kept RPMs at about 2,000. after about 2 minutes i tried slowly revving it up to 2,500 and kept it there for about 30 seconds then suddenly the engine died. (this is also where i need help, i have no idea whats made this happen) the engine fans came on shortly after it died.
CODES: the codes the car gave us were;
Engine: P0301; Cylinder one misfire detected. (we put different spark plug and wires on rotor 1, then erased the codes but they still came back when we started it the second time)
Transmission: U0101; Lost communication with TCM.
I'd appreciate any help at all. if you need any information just ask and ill try to answer. THANK YOU!!!!!
BACK STORY: A few weeks back me and my dad bought a 2004 Rx8, 4 speed auto, 127k miles, the engine was overheated and burned out by the previous owner. from the looks of it, the car hadn't been started for a long while when we got it. The engine would spin but wouldnt turn on.
WHAT WE TRIED: We bought a new engine that came out of a running car with 50k miles. it was from a 2004 manual 5 speed. we swapped the old engine with the new one, but kept the old wiring, old computer, and old transmission. as well as everything else not pertaining to the main engine. it also has the updated N3Z2 starter from the old engine.
We changed the oil, tranny oil, added gas (since the old one was probably no good), new oil filter, reset ESS (aka 20 brake pumps) , checked and cleaned the ESS sensor, Checked and cleaned MAF sensor and made sure to keep the battery charged at all times. We also checked the spark plugs, coils, and wires in the new engine and they looked clean. we bought a new radiator but haven't yet installed it.
CURRENTLY: Today we went and cleaned up the engine and tried to crank it. The first couple of times we tried it just spun over and over. Eventually after a while of trying we got it to crank (had to give it gas while cranking). At first it would only stay on if i was giving it gas, a lot of white smoke came out and i let go of the gas after about a minute and it stayed on like that (everything sounded normal) for about 5 minutes, after that i tried to rev it up to 2,500 but my foot slipped slightly and the revs dropped and caused the engine to die (this is where i'm stuck) engine temperature was at about half way in the gauge.
We tried turning it back on a bit later but it went back to just spinning over. after fiddlying around with the car we noticed a cable was unplugged at the transmission (we have no idea where it goes, ill try to get a picture soon so you can help) my dad said it shouldnt have anything to do with the engine so we tried turning it on again and it finally did (took about 10 seconds of cranking while giving it gas, as well as a battery charger connected to the battery and some starter fluid) some more white smoke came out but a lot less than the first time. I kept my foot on the gas and kept RPMs at about 2,000. after about 2 minutes i tried slowly revving it up to 2,500 and kept it there for about 30 seconds then suddenly the engine died. (this is also where i need help, i have no idea whats made this happen) the engine fans came on shortly after it died.
CODES: the codes the car gave us were;
Engine: P0301; Cylinder one misfire detected. (we put different spark plug and wires on rotor 1, then erased the codes but they still came back when we started it the second time)
Transmission: U0101; Lost communication with TCM.
I'd appreciate any help at all. if you need any information just ask and ill try to answer. THANK YOU!!!!!
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