So my 08 LNF has developed a new quirk since its been tuned. It throws completely random (always different never been the same one twice) codes. It started with a MAP low voltage then an EVAP, then a service air bag. None of which have persisted. Either they resolve themselves or I clear it with a scanner and it never comes back. The other day it gave me a cel and the reduced power message out of nowhere but nothing notable happened prior to this. I pull over plug the obd2 scanner in and there's nothing. No codes at all. So I kill the car and let it sit for a minute and check fluids and wiring. Everything seems to be perfectly normal. Start the car back up and no cel but still have the reduced power message but no cel or codes. So I go for a test drive and the car is running completely normal, no loss of power, boost is normal, no weird noises or smells. Im at a loss the car seems fine to me. If someone else on here has had this problem and resolved it point me in that direction otherwise please help

 

I haven't ran into anything like this, but it's definitely weird. Almost sounds like a grounding issue.

 

I emailed ZZP since they were the ones that tuned it and they recommended checking my pcm connections. Haven't had time to do it yet but if I get any results from that I'll post it on here just in case it helps anybody else out. Also I'm currently running a K&N CAI, gms1 map sensors, stage 2 clutch, ZZP 3in dp, custom 3in cat back straight pipe, and ZZP LNF PCM tuned on 93. Just for reference.

 

I'd have to agree. With how sporadic it is and not being the same thing repeatedly, most likely the grounding points could use a going over.

 

UPDATE: So I've been in contact with ZZP and they agree that it sounds like a ground/wiring issue. I disconnected the batt and checked the pins on the PCM and hooked everything back up after about 20 min, every thing is normal and the Reduced power message is gone. hooked a scanner up and drove around for 30-45 minutes and all seems to be well, Ill dig deeper into the grounding issue this weekend more than likely. Thanks for the help.

 

Also i forgot to mention that three of the monitors are registering as 'not ready on the scanner when it first links up abd says 'noDTCS'. The three monitors are CAT, EVA, and O2S that are red. The rest are green and 'ready'.
sorry, wrong thread