I just replaced head gaskets on daughter's '06 Tribeca with 130k. Fired up right away and no problems or leaks for 40 miles or so. Now it is missing and threw the code for "cylinder 1 misfire". I did replace the plugs when I had the engine out.
So I did the following in this order:
1. Switched #1 and #3 coils - no change. cylinder 1 still misfiring. I double checked the engine code by pulling the injector connector off #1 while it was running - no change.
2. Checked compression - it's around 130 psi. The spark plug was dry, expected it to be fouled if there was fuel and no spark.
3. Checked resistance on injectors. They were all around 14 ohms.
4. Did the hold-screwdriver-to-ear-and-to injector trick while vehicle is running. I can hear the injector clicks on cylinders 3 and 5, but nothing on #1.
What next? Noid light and see if I'm getting impulses from the injector connector while running? I don't have a noid light yet, but thought I could put 12 volts to the injector while it's running and see if the miss goes away. Would that rule out a bad injector? Or is that a bad idea?
I tried to search this before posting, but didn't see a comprehensive post on testing injectors.
Thanks in advance for the advice. I'm a first time caller, but have gotten a lot from this site just searching the old posts. You guys are great!
Edited by Becca06, 08 January 2018 - 12:50 PM.