RangerShane97
Member
So I have been fixing up a 1994 Ranger that sat parked for about a decade. I have gone through the thing pretty thoroughly, but it still has a slight miss at idle, hesitates when you first step on the gas, and is really low on power. Occasionally it runs super rich, but other times its fine, and the only code it has thrown is for the Spark Out circuit being open. I really am out of ideas at this point. So far what I have tried is:
-Replaced fuel filter, air filter, spark plugs, gave it fresh 87 octane gas, and even tried 93 octane.
-Replaced the coolant temp, oxygen, and MAF sensors, and verified that the TPS works.
-Eliminated all vacuum leaks I could find, and replaced the intake tube.
-Ran a wiggle test which showed no problems, and also checked the continuity of the Spout circuit (good from ICM to PCM).
-Checked the fuel pressure(~35 psi KOER), and the fuel pressure regulator(~40 psi KOER with the vacuum line off).
-Verified all the spark plugs are firing, and all the injector circuits are working according to a noid light.
-I also pulled the upper intake off, and cleaned it and the lower(didn't pull the lower intake off). Also tightened the lower intake down a bit.
At this point all I can think is an injector issue is causing the hesitation and A/F issues, but I'm not sure about the Spout circuit as I can not find any shorts or breaks anywhere in the circuit. I figured I'm going to have to pull the lower intake and clean/replace injectors, but that still won't give me ignition advance, and without that it is super lazy. Any advice or ideas are greatly appreciated.
-Replaced fuel filter, air filter, spark plugs, gave it fresh 87 octane gas, and even tried 93 octane.
-Replaced the coolant temp, oxygen, and MAF sensors, and verified that the TPS works.
-Eliminated all vacuum leaks I could find, and replaced the intake tube.
-Ran a wiggle test which showed no problems, and also checked the continuity of the Spout circuit (good from ICM to PCM).
-Checked the fuel pressure(~35 psi KOER), and the fuel pressure regulator(~40 psi KOER with the vacuum line off).
-Verified all the spark plugs are firing, and all the injector circuits are working according to a noid light.
-I also pulled the upper intake off, and cleaned it and the lower(didn't pull the lower intake off). Also tightened the lower intake down a bit.
At this point all I can think is an injector issue is causing the hesitation and A/F issues, but I'm not sure about the Spout circuit as I can not find any shorts or breaks anywhere in the circuit. I figured I'm going to have to pull the lower intake and clean/replace injectors, but that still won't give me ignition advance, and without that it is super lazy. Any advice or ideas are greatly appreciated.