Missing on every other cylinder
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Missing on every other cylinder
Ok this is a 1996 Ford F-250 4x4 with a 460, trani has overdrive, Was driving all was great and then died, started back up had a severe miss and continues to try to die. SO far i have determined i have stong fire to all plugs. I have checked for all vacumn leaks found 1 or 2 reapired them no response,
I also check the input wire to the injectors and the seem to be opperating fine, i also held a screwdriver to each one as the vehicle was running to see if i could here them pop, and seems fine. I i even reversed the wires from the injector on a cylinder not firing and swapped it with a firing cylinder, and the same cylinder did not fire. I have upluged the ecm and replugged it no fix, I have also sprayed some carb cleaner around the intake, and throttlebody to check for airleacks, still no problems found. But for sure cold/hot, driving or sitting it is missing on four Cylinders consistantly. Please help with feedback thanks.
I also check the input wire to the injectors and the seem to be opperating fine, i also held a screwdriver to each one as the vehicle was running to see if i could here them pop, and seems fine. I i even reversed the wires from the injector on a cylinder not firing and swapped it with a firing cylinder, and the same cylinder did not fire. I have upluged the ecm and replugged it no fix, I have also sprayed some carb cleaner around the intake, and throttlebody to check for airleacks, still no problems found. But for sure cold/hot, driving or sitting it is missing on four Cylinders consistantly. Please help with feedback thanks.
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plugs, cap, rotor button all new, i replaced them first and then continued to the rest, and the fire to each plug is very strong, it will start and run on just the foru cylinders but it is rough.
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Did not check fuel pressure, but will first thing in the morning, also had the codes pulled, air temp sensor, throttle pos sensor, and and of corse the O2 sensor because its running so rich, but the check engine light does not stay on but a few seconds then goes off, and was told that these sensors "Should" not play a part in why its missing on everyother cylinder, also i noticed each cylinder its missing on the injector wire is tan and red, but the ones its running on the wire to the injectors are white, but i swapped those and mad no diffrence the same cylinders still missing.
Last edited by bbrockway20; Jan 12, 2008 at 07:49 PM.
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First off thanks very much for the replies, i did check fuel pressure 38-40 psi seems to be where it is, also replace ing control mod, and tps, no changes, also i just read about the red wire for the injector being open, how would i test for this and any suggestions for repair?
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All injectors should get +12V with the key on. The PCM grounds them to fire them; in your case 4 at a time. It would be best to check them with a noid light to see if they're firing. It's hard to tell by just sound. I agree, sounds like an open wire somewhere.
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ok i did test each plug conection with a test light, i do not have access to a noid kit , i checked for pulse pulse length and also check strength of light itself, i checked each both 2 times and all are pulsing when i roll the engine over, when i have the tester plugged in key off nothing, and when tester plugged in and key in on position nothing, only pulses when rolling over which seems to be correct
Last edited by bbrockway20; Jan 12, 2008 at 11:17 PM.
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From: The dark carnival
Originally Posted by bbrockway20
First off thanks very much for the replies, i did check fuel pressure 38-40 psi seems to be where it is, also replace ing control mod, and tps, no changes, also i just read about the red wire for the injector being open, how would i test for this and any suggestions for repair?
You could also verify that the missfires are caused by a lack of fuel as opposed to spark by measuring the HC content of the exhaust.....low HC = fuel missfire, high HC = spark missfire.
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Hmmm does not seem low on fuel, i smell fuel pretty strong fumes of it when its running, also pulled the plugs that i just replace to see if i could tell what might be happenning there, the results where the cylinders not firing the plugs where wet, and i mean really wet, the firing cylinders the plugs where black dark black but dry, as if it where loaded up running rich, on the opperating cylinders. These plugs where installed this morning and maybey drove 2 -5 miles trying to test each result.
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Originally Posted by bbrockway20
ok i did test each plug conection with a test light, i do not have access to a noid kit , i checked for pulse pulse length and also check strength of light itself, i checked each both 2 times and all are pulsing when i roll the engine over, when i have the tester plugged in key off nothing, and when tester plugged in and key in on position nothing, only pulses when rolling over which seems to be correct
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From: The dark carnival
Originally Posted by bbrockway20
Hmmm does not seem low on fuel, i smell fuel pretty strong fumes of it when its running, also pulled the plugs that i just replace to see if i could tell what might be happenning there, the results where the cylinders not firing the plugs where wet, and i mean really wet, the firing cylinders the plugs where black dark black but dry, as if it where loaded up running rich, on the opperating cylinders. These plugs where installed this morning and maybey drove 2 -5 miles trying to test each result.