My 84 LX 5.0 with a CFM setup is not a daily driver but it actually ram much better when I did drive it every day.
last winter it sat in my garage from November till April of this past Spring. The idle seemed off, running high RPMs when I first took it out so I reset the curb idle as per Ford Racing sheets instructions. The car only gets taken out every other week or so as I had time to use it. In the summer months I noticed the idle was back to racing again. I reset it again yesterday and got it to run at 1000 rpms in park and 550 in drive but it still idle hunts in park. I disconnected the neg bat terminal to clear the ECM as well.
Today i pulled codes and compared to last year when the car was pulling three 11's on a code read my results now are disappointing to say the least. I cant imagine why it turns to crap from just sitting.
I ran the test twice and got same results.
KOEO - 11
CM - 18,22,42
KOER - 21
I think the KOER -21 was a false code since the car may not have been at 195 degrees when I ran the test. This year also for some reason my car struggles to get to operating temp. Seems to run cooler than it should in the heat of summer. the only exception is if I'm in stop and go traffic for a long time, then the gauge runs to almost pegged. Otherwise it barely climbs off the coldest setting.
The CM codes are what concern me. I have changed the 22k ohm resister more than once and it still reads 22k ohms. So I could never figure out why the code 18 comes and goes. That one has showed up infrequently the past few years. Code 22 is MAP out of range, but only in CM not in KOEO? I dont get it. I have an extra I can try to swap. Code 42 is pointing to a rich condition in CM not KOER so that concerns me too. I've been to hell and back with my O2 sensor set up and I am 100% sure my ground is good, behind the head where its supposed to be and my voltage wire is clean, unbroken and still connected to the O2.
So what can I do? The car seems to never warm up fully and find its correct rpm. Its been running choppy at idle.
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