ecu splicing maf and crank angle sensor together?

[doomedfob]

Would there be any reason why my crank angle sensor wire is spliced together with my maf sensor wire? the ecu pin-outs splice together and end up to i really dont know. I rewired the maf and my engine started to idle a little better, but im still stumped with the reason why they would be together. Mainly I hard wired a safc2 and my kade would not start up if the safc is connected. I put all the settings in correctly but when the maf and cas were spliced together the car would fire and die with the safc connected. if it was unplugged it would start up normally. When I wired up the maf individually the engine would crank like my timing was off or no spark.

[Hijacker]

More than likely, it's the ground for the shielded wire. Both the MAF and CPS ground to the same engine ground. The CPS goes one step further and has a physical ground coming from the CPS to ground out to the same ground. Granted, this is for 91-94 motors. If you pulled the MAF from that ground circuit and grounded it to a devoted ground, I don't see how that would kill your timing. It's pretty standard practice to do things like that when there are MAF issues or when upgrading to a larger MAF.

I think the issue is in the safc. I've never particularly thought they were any good as anything modifying sensor signals to fool the ECU is bound to cause issues. I would make sure that it's wired into the system properly since pulling it from the circuit causes the car to run fine. SAFCs are designed to intercept the MAF signal, so if you unplug the SAFC, how is the car even getting the signal? The signal wire should be cut and diverted to the SAFC (in series).

[doomedfob]

I must have instead spliced the grounding maf/cps ground to my safc than the actual maf signal. I'll recheck my pinout locations. I assumed the reason why my wiring harness was all spliced up because the previous owner put in a 95 manual ecu when the car's a 96.

[Hijacker]

If the ECU is an OBD 1 ECU, I can understand some hacking. If the harness is completely jacked, I would recommend going through the EC section of the service manual and fixing whatever he sliced and spliced.