SEFI conversion to MAS Reply #30 – March 19, 2017, 10:39:58 PM I also think you should check the O2 ground. I had a Mark VII that threw the O2 lean codes as a result of the O2 ground wire being broken. Quote Selected
SEFI conversion to MAS Reply #31 – March 19, 2017, 10:43:07 PM ground is attched to back of the head , they are very old and im sure have had coolant ect spilled on them ( car sat in the shop for about 10 years apart) Quote Selected
SEFI conversion to MAS Reply #32 – March 20, 2017, 08:35:09 AM Should be 2 grounds......Braided strap head to firewall on driver side and orange wire from ECU to stud at back passenger side of the upper to lower intake. There should also be the link bar joining the upper passenger side to the lower driver side on that same stud.John Quote Selected
SEFI conversion to MAS Reply #33 – March 20, 2017, 09:59:10 PM braded strap has been replaced with a heavy gauge wire from body to block (battery has been relocated to trunk) not familiar with the "link bar" you are referring to , do you have a pic ? Quote Selected
SEFI conversion to MAS Reply #34 – March 21, 2017, 02:02:41 AM It's a weird metal bracket that attaches to the intake stud behind the upper intake. Quote Selected
SEFI conversion to MAS Reply #35 – March 21, 2017, 04:33:47 AM looked like a horse shoe with two eyelets ? i have not seen one on a car in a long time - and i believe they were to keep wires from chafing on the back of the intake Quote Selected
SEFI conversion to MAS Reply #36 – March 21, 2017, 01:44:13 PM You sure the O2 sensor connectors are reading the correct banks? Quote Selected
SEFI conversion to MAS Reply #37 – March 21, 2017, 05:40:58 PM interesting , left could be reading right and right left ? i did not realize they could be "backwards" Quote Selected
SEFI conversion to MAS Reply #38 – March 23, 2017, 01:00:49 PM Yup. Connectors are the same. The wiring for each side is a specific color. Pull up a Chilton diagram and check Quote Selected
SEFI conversion to MAS Reply #39 – March 23, 2017, 06:42:43 PM anyone have a pin out of connector 429 (o2 harness) its a 8 pin connector , pin 49 is orange (ground) in #2 slot of connector , my right o2 pin 29 is dg/p in #6 slot, db/lg left o2 pin#43, gy/y in pin #4 , pin 44 gy/r ---i have three pins left #1 r/b, pin 7 -g/w, pin #8 black --can anyone tell me what pin is 44 in the connector ? i have a 87 cougar evtm and the harness is diffrent color on this pin only Quote Selected
SEFI conversion to MAS Reply #42 – March 23, 2017, 08:59:40 PM Two things I see:1. Is that MAF calibrated for a conical filter clamped to the end? If not it will mess with the signal.2. You don't have a line from the throttle body nipple to a valve cover. This is vital for proper air metering in a MAF system. Quote Selected
SEFI conversion to MAS Reply #43 – March 24, 2017, 06:40:58 AM If you still have the PCV valve connected, and a open breather cap instead of having that hose connected, you've created an unmetered air leak. Think of it like a vacuum leak though the crankcase. Because of this, the engine is breathing air through the crankcase that hasn't been measured my the MAF. Your MAF reading ends up skewed downward and that will contribute to less fuel and a lower calculated load, which goes down a whole line of now inaccurate math, you end up without enough advance under load, weird injector timing, and less torque. I'm sure there is more, but that's all I can come up with on a half cup of coffee. Quote Selected
SEFI conversion to MAS Reply #44 – March 24, 2017, 07:54:47 AM The pcv is located in the back of the lower intake but both valve covers are essentially open to the atmosphere -- so i should have the tube from the tb to a valve cover and seal the other ? Quote Selected
Topic: SEFI conversion to MAS (Read 8767 times)
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