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Ford expert
Ford expert, ASE Certified Technician
Category: Ford
Satisfied Customers: 10370
Experience:  30 yrs,experience shop owner,
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i have a 1997 ford f150 v8 changed both coil packs engine still

Customer Question

i have a 1997 ford f150 v8 changed both coil packs engine still skips code says cyld 1&7 miss fire fuel circut one open loop what does this mean thanks john.
Submitted: 7 years ago.
Category: Ford
Expert:  Ford expert replied 7 years ago.
what is the exact code you are getting?
Customer: replied 7 years ago.
i will have to send it to you a little later i am not at home
Expert:  Ford expert replied 7 years ago.
Customer: replied 7 years ago.
sean i thougth i saved the codes in my code reader but i didn't and i do not have the truck here at this time. anny suggestions?
Expert:  Ford expert replied 7 years ago.

i can pinpoit it better if you can get the codes, when can you get to the truck?

Customer: replied 7 years ago.
sean, i was able to get the codes this moring. they are as follows,p0307 cylinder 7 misfire detected p0301 cylinder 1 misfire detected. p0301 fuel system 1 open loop-drive
Expert:  Ford expert replied 7 years ago.
which v8 is it?
Customer: replied 7 years ago.
it is 4.6 v8
Expert:  Ford expert replied 7 years ago.

this can also be a couple of bad injectors , or low compression ,or possibly a faulty pcm ,here is some tests for you to do and let me know what you find

Tests/Procedures:1. Monitor the coil trigger signal on the Pink/White (PK/W) wire during the condition and monitor the Crankshaft Position (CKP) sensor signal for an erratic pattern when the engine starts to run poorly and act up.

2. If the coil trigger signal is erratic but the CKP sensor signal is consistent, it suggests a problem with the PCM's triggering of the PK/W wire.

3. If the trigger signal appears to be consistent along with consistent spark, unplug the voltage regulator connection at the alternator to verify that the condition is still present. If not, check the alternator output or diode pattern for indication of a defective alternator.

4. Check voltage drop of the Red/Light Green (R/LG) wire at the coil pack to verify that there is not a problem with the power supply to the coil.

5. Perform a wiggle test of the CKP sensor circuits and connections with the engine idling and the lab scope installed on the CKP sensor circuits to see if the signal can be interrupted indicating a problem with the circuit(s).

Customer: replied 7 years ago.
sean, is the pcm the same as the vehicles main computer?
Expert:  Ford expert replied 7 years ago.
yes it is

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