2004 navigator we have in the shop a 5.4 3 valve with a engine miss at idle . cylinder 8 . installed new plug and coil and injector. we havent done a compression test yet and waiting for the customer to bring it back in. but still is setting code for 8 cyl. any ideas?
Cars & Trucks - Lincoln - Navigator - 2004 Lincoln Navigator
Answers & Comments
Have you used a NOID light to see if injector is getting a signal, the NOID lite is a little test tool that plugs in the injector connector and flashes when eng is running is signal is present, a vacuum leak can cause this as well, also the injector can be faulty, check the compression 1st, then do the other tests, I was a dealer tech so I had access to a piece of test equip called a SBDS, it could quickly give me all the info about the miss-fire, most case knew the problem in 10 minutes, of course the machine cost $75,000 so in a independent shop it is out of the question. Good Luck
Yes many tiimes, but when I retired the 5.4 was a new engine to the line, I am a retired Ford Factory certified master electronics tech, the steps I recommened are what I would do, have you run a cylinder balance test, can your test rig do that?