JesusHaro98

So I bought a 350z about 2 months ago it started at first but it had codes and I decided to fix them myself so I replaced the plenum gaskets and knock sensor harness and knock sensor itself apparently there was a rat nest in the area where the knock sensor is located I cleared out all the trash and cleaned it out made sure nothing got into my valves and all that I replaced all that stuff and put everything back together I replaced all the gaskets even the throttle body gasket and I hooked up all the hoses put everything back together and tightened and car wouldn’t start... I thought it was the maf sensor so I bought a whole new sensor and a whole new air filter k&n to be exact I hooked everything up and still nothing car starts revs up to 3 then dips super low and then stalls out idk what it could be idk if it’s the harness or what I’m so discouraged rn I feel like giving up on this car tbh...

JesusHaro98

Sorry I’m not good at explaining things all that well the car has no codes on it atm so idek what it could be I’m thinking it might be the wiring harness but idek

dkmura

iTrader: (64)

Welcome- moved this thread to the appropriate forum. It would help to post more background details on your Z including: mileage, any mods, any repair/maintenance records, how did you start your repairs and any other details that might help us to provide any guesses?

JesusHaro98

155,000 miles it’s had new shocks and struts it’s been completely grounded with red wires I’m not sure but it has a body kit the previous owner I bought it from didn’t give me much info on records so as far as I know they didn’t do much engine wise they did however have an after market air filter kit on it which I recently replaced maf sensor and all and I’m still having problems... I’m gonna tear down upper and lower plenum again and see if I have any leaks

dkmura

iTrader: (64)

At 155K there could be a number of failures, and with no history I would start with pulling codes from the onboard diagnostic system. In the meantime, change all the fluids (oil/filter, tranny, diff and brake) to get a fresh start with this well-used Z.