My guess here is with the O2 sensor placement and an open exhaust you are not going to get really good readings. The O2’s on my Coupe are about 8” further down in the X-pipe. However, the ECU is in Open Loop when the engine is cold I.e. when you first start it due to the ECT sensor not being at the minimum temperature to switch to closed loop. The reason this is important is that I open loop the ECU ignores the O2 sensors and delivers fuel based solely on the tables in the ECU. When the motor reaches the minimum temperature the ECU switches to closed loop and uses the O2’s to trim the fuel.
I would think that if you cleared the codes you would see that the lean condition is not present when first firing up being it’s in open loop and is not utilizing the O2’s. It does however use the MAF, ETC, and ATC sensors.
You need to focus on the MAF issue. Have you cleaned the MAF sensor wires?
I would think that if you cleared the codes you would see that the lean condition is not present when first firing up being it’s in open loop and is not utilizing the O2’s. It does however use the MAF, ETC, and ATC sensors.
You need to focus on the MAF issue. Have you cleaned the MAF sensor wires?
First, the pics show that the engine is not in a 93 mustang chassis, this brings some questions since this is a transplant:
Are you using the factory 5.0 wiring?
Do you have all the grounds duplicated from the mustang chassis?
You have the symptoms of a vacuum leak, but with no head pipes the 02s cannot read accurately.
Are you using the factory 5.0 wiring?
Do you have all the grounds duplicated from the mustang chassis?
You have the symptoms of a vacuum leak, but with no head pipes the 02s cannot read accurately.
I’m gonna go out on a limb here and say the MAF is junk. If the motor is using 19 lb/hr injectors the you need a factory MAF to go with it. Someone on here should have one (@ General karthief) for a reasonable price. I wouldn’t trust an auto parts store one as far as I could throw it.
You really need to get the exhaust done through the mufflers and move the O2’s about 8” further down the pipes.
You really need to get the exhaust done through the mufflers and move the O2’s about 8” further down the pipes.
Not to argue with AeroCoupe but I have my O2 sensors in the same place as you and mine is fine. I would agree that you need to add some exhaust pipe after the collector say 18-24" to get the O2 sensors to readings right. My old iron manifolds had the O2 sensors between the last port and the flange so I think having the sensors in the collector is OK.