scrivyscriv
Active Member
- Joined
- June 1, 2008
- Messages
- 93
- Reaction score
- 2
- City, State
- Memphis, TN
- Year, Model & Trim Level
- 02 Ranger XLT 2WD auto
93 2wd 168k mi, 4.0L 5 speed
My engine has been missing for a while now, and I just assumed it needed PM. I changed the plugs & wires and have run a few bottles of injector and fuel system cleaner through the tank over a few thousand miles, but still I get a miss and rough idle. Not enough to be a big problem, but will interfere with acceleration when changing gears at low RPMS's (manual transmission) and the rough idle sounds like I don't take care of my truck.
I checked the EEC-IV codes and either the first or second group of KOEO codes, if I remember correctly, indicated an ignition control module fault. My check engine light will come on periodically but if I shut off the engine and restart, the CEL doesn't usually come back on.
This past winter, my tach started acting up - it would read low 1000's and rise and fall coinciding with engine speed, but would not indicate actual engine RPM's until the engine had been running for about fifteen minutes (from a cold 45 degree ambient start), at which point it would suddenly jump to the actual engine RPM's and indicate normally. It still acts up even in the muggy heat we have in Mississippi - incorrect RPM indication, sometimes working, sometimes not.
In the process of trying to fix my (unrelated) A/C problem, I picked up a wiring diagram from the forums and noticed that the WOT A/C cutoff relay goes to the ICM (ignition control module), which has a lead labeled "to tach & test conn."
Is that lead going to the tachometer? Would an erratic tach indication correlate with an ICM fault?
I'm down to either injectors/fuel rail or ICM/coil/crank sensor. Unfortunately the injector testing tools are expensive and require upper intake removal; and a new ICM is $150 - $250. I've got to isolate the system causing the problem so I won't have to spend twice as much, Lol.
So yeah. Love to hear some opinions/facts/ideas and see any charts or pictures y'all might have stored somewhere on your hard drive. Thanks in advance!
My engine has been missing for a while now, and I just assumed it needed PM. I changed the plugs & wires and have run a few bottles of injector and fuel system cleaner through the tank over a few thousand miles, but still I get a miss and rough idle. Not enough to be a big problem, but will interfere with acceleration when changing gears at low RPMS's (manual transmission) and the rough idle sounds like I don't take care of my truck.
I checked the EEC-IV codes and either the first or second group of KOEO codes, if I remember correctly, indicated an ignition control module fault. My check engine light will come on periodically but if I shut off the engine and restart, the CEL doesn't usually come back on.
This past winter, my tach started acting up - it would read low 1000's and rise and fall coinciding with engine speed, but would not indicate actual engine RPM's until the engine had been running for about fifteen minutes (from a cold 45 degree ambient start), at which point it would suddenly jump to the actual engine RPM's and indicate normally. It still acts up even in the muggy heat we have in Mississippi - incorrect RPM indication, sometimes working, sometimes not.
In the process of trying to fix my (unrelated) A/C problem, I picked up a wiring diagram from the forums and noticed that the WOT A/C cutoff relay goes to the ICM (ignition control module), which has a lead labeled "to tach & test conn."
Is that lead going to the tachometer? Would an erratic tach indication correlate with an ICM fault?
I'm down to either injectors/fuel rail or ICM/coil/crank sensor. Unfortunately the injector testing tools are expensive and require upper intake removal; and a new ICM is $150 - $250. I've got to isolate the system causing the problem so I won't have to spend twice as much, Lol.
So yeah. Love to hear some opinions/facts/ideas and see any charts or pictures y'all might have stored somewhere on your hard drive. Thanks in advance!
