97 Mark VII new ECM need to unplug MAF to drive it

[fasttoys]

1997 Lincoln Mark VIII 4.6 Ltr standard edition

I replaced every sensor underhood including 8 new coils and spark plugs, MAF, CTS, Ambient sensor, IAC, Electric Fuel PUMP, filter and relay, Fuel Pressure Regulator, Fuel Pump Voltage regulator, TPS, Crankshaft Sensor, Camshaft Sensor.

ALL these tested good on DRB II but wanted new. This week I replaced with NEW ECU or ECM whichever you call it and it runs much better. I can ONLY drive it with MAF disconnected. Connected it starts and idles fine, but no Throttle response. I disconnect it and drives very good but a bumpy idle and some hesitation. It hauls the mail at full throttle after those secondary plates open after 3000 RPM.

IS it the electric harness underhood which I have seen for sale on occasion or something under dash, I am ready to have it Exorcists. Any Help much appreciated.

 

[fasttoys]

One for the Books, the MAF Harness had a break in it causing all the problems with vehicle. I did a continuity test on all 4 pins after removing the harness from the air box. Each of the 4 showed continuity and I also checked each pin for cross wiring (short) after repair the vehicle drives well with MAF connected.

 

[chris2523]

nice troubleshooting. that's a tough one.

 

[slowmkviii]

Welcome
And I agree nice troubleshooting

 

[fasttoys]

Thanks

nice troubleshooting. that's a tough one.

Thanks again, actually I should have figured this out long ago