My Mark VII has been running like crap lately. Have asked the mark VII people on lincolns online and have gotten some good suggestions but havent fixed the it yet.
The problem is when the engine is running, if i turn on the defroster, the headlights, or the heater (at least two of those at a time) it runs like crap, missfiring, bucking, idling erratically and the instantaneous MPG's go down to 2 or 3. So far i have cleaned the IAC, and also tried 2 other ones. Cleaned the EGR valve, and tried a second one. Cleaned out the egr filter thing. Cleaned throttle body. Re adjusted the tps into range. Fixed some crispy wiring on the ECM relay. New voltage regulator. New ignition switch. Put on a different starter selenoid. Replaced battery. replaced + battery cable. Cleaned up contacts on - battery terminal. The plugs and wires arent new but they look good. Checked the voltages: 12.5 engine off, 14.1 engine on, 13.5 engine on with defroster, heater, lights on. Checked the voltage at the ecm relay and it was fine. Voltage at fuel pump relay fine. Hotwired fuel pump, it sounds nice and smooth. With accessories on it slows a little, but is still very smooth. Fixed all the vacuum lines i could find that were cracked. Fixed all the codes i pulled, pulled them again today and just got a code 40 which one site describes as (SERIES FUEL/AIR INJECTION CODES ON VEHICLES WITH DUAL OXYGEN SENSORS REFER TO THE RIGHT OR REAR SENSOR. EXCEPT: 1984-1988 3.8L ENGINES: LEFT SENSOR) and ford fuel injection describes as (Cylinder #4 Failed Cylinder Balance Test.) Anyone know which one it actually is? Either way, i'm doubting it has to do with this issue.
Seems like the more stuff i "fix" on this car the worse it runs. I still cant get the idle to settle down even with the defroster, etc. off. If anyone has any sort of ideas on fixing this please let me know.....
The problem is when the engine is running, if i turn on the defroster, the headlights, or the heater (at least two of those at a time) it runs like crap, missfiring, bucking, idling erratically and the instantaneous MPG's go down to 2 or 3. So far i have cleaned the IAC, and also tried 2 other ones. Cleaned the EGR valve, and tried a second one. Cleaned out the egr filter thing. Cleaned throttle body. Re adjusted the tps into range. Fixed some crispy wiring on the ECM relay. New voltage regulator. New ignition switch. Put on a different starter selenoid. Replaced battery. replaced + battery cable. Cleaned up contacts on - battery terminal. The plugs and wires arent new but they look good. Checked the voltages: 12.5 engine off, 14.1 engine on, 13.5 engine on with defroster, heater, lights on. Checked the voltage at the ecm relay and it was fine. Voltage at fuel pump relay fine. Hotwired fuel pump, it sounds nice and smooth. With accessories on it slows a little, but is still very smooth. Fixed all the vacuum lines i could find that were cracked. Fixed all the codes i pulled, pulled them again today and just got a code 40 which one site describes as (SERIES FUEL/AIR INJECTION CODES ON VEHICLES WITH DUAL OXYGEN SENSORS REFER TO THE RIGHT OR REAR SENSOR. EXCEPT: 1984-1988 3.8L ENGINES: LEFT SENSOR) and ford fuel injection describes as (Cylinder #4 Failed Cylinder Balance Test.) Anyone know which one it actually is? Either way, i'm doubting it has to do with this issue.
Seems like the more stuff i "fix" on this car the worse it runs. I still cant get the idle to settle down even with the defroster, etc. off. If anyone has any sort of ideas on fixing this please let me know.....
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