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Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23821
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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F150 FX4: I have a 06 f150 with 5.4 codes po175 po305 po308

Customer Question

I have a 06 f150 with 5.4 codes po175 po305 po308 I've replaced 2 coils 2 spark plugs and upstream 02 sensor on bank 2 and still have a misfire checked injector they seem to be working (clicking) not sure what to do next HELP??
Submitted: 2 years ago.
Category: Ford
Expert:  Wayne Crawford replied 2 years ago.
Hello. My name is ***** ***** I will be helping you today.I think the next step would be to do a compression test.
Customer: replied 2 years ago.

ok went for a test drive after installing 02 and now I have code po2195 as well just checked for vacuum leaks seems ok

Expert:  Wayne Crawford replied 2 years ago.
Check the compression and let me know what you get so we can either point to a base engine mechanical issue or rule it out.
Customer: replied 2 years ago.

checked compression 145psi on 8 not getting code for 5 anymore and on the first turn over seem to have lots of gas in cylinder.. checked spark its ok

Expert:  Wayne Crawford replied 2 years ago.
Did you only check the 1 cylinder? Without anything to compare it to we dont know if its good or not.
Customer: replied 2 years ago.

125psi on #1 ...would a leaky injector cause this problem or fuel pressure?

Expert:  Wayne Crawford replied 2 years ago.
Yes either could cause it. The next suggestion I would have lacking a full compression test is to either check fuel pressure or swap the injector with a known good one.