Compression Ignition Addict
Join Date: Jul 2010
Location: Falls Chruch
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replace the map sensor and the vacuum line first, then see how the truck runs.
I'm always very speculative of anyone who says inj #3 or #8 is bad. Its 100% normal for those injectors to throw codes, and expected. Need to know what the contribution percentages are to really determine if its a bad injector, and even then, its not completely accurate.
#4 is curious though.
Remove the valve covers and start the truck. Check to make sure the harness hasnt popped off the injector. Check if #3 and #4 are squirting oil while running.
Nonconformist. Functionality over bling.
My three rules for 7.3l troubleshooting: 1) Replace CPS and keep a spare. 2) Replace FPR and know your fuel pressure. 3) Hook it to a scanner and check for codes.