The car is a 92 5.0 Mustang. Car ran fine prior to install of AFR heads and FTI cam. Since install, car ran great for about a week. Then I installed 24lb injectors and matching PRO M meter. I found that the lower did not seal so I installed it again and it is sealed. The car will not idle when I first start it. It revs up to 3000 then dies. I have to keep my foot on the gas. After a few minutes it will idle. Once I get on the road runs okay but it does buck slightly at lower RPMS (AOD with stock stall). However, once it reaches operating temp especially if I wait at stop light for long the idle drops from 900 to 600. Then I get a check engine light. The codes are 91 & 41 No EGO switch. The car then sounds rich and has no power when I drop the hammer. The car has O2 sensors that are less than one year old, new act, new egr, new injectors, new IAC. I have checked and set the TPS at.99. I have cleaned the IAC and also run a idle air control plate. I have swapped mass air meters and get the same result. I have also unplugged the 02 sensors and drove the car until it engaged the closed loops system with the same result with them plugged in. According to Pro M, this indicates the problem is not the Mass Air but probably with the close loop system. Can anyone tell me how to track down the problem? I know you can do this by checking the voltage output for all sensors in the closed loop system. However, I don't what the acceptable voltage level is for each component. I suspect it could be the ECT but I'm not get a code for it.
Help please! I have not been able to enjoy the heads and cam since they were installed. I may have to take the car to someone with the tech expertise to tell me what is wrong.
Help please! I have not been able to enjoy the heads and cam since they were installed. I may have to take the car to someone with the tech expertise to tell me what is wrong.