I've had an issue with my truck not wanting to start. It doesn't happen all the time, but it's becoming a problem since I'm about to drive to Houston next week towing a trailer.
I get a code P1277 (Cylinder #7 Open circuit, open injector, failed IDM
). This is the only code I get (does NOT set a P1316), and only pops up under a KOEO
test or an Injector Buzz test. It does not pop up on it's own, does not set a check engine light, and doesn't come up under any other tests. With the engine fully warm, cylinder #7 shows 0% change in rotational velocity. All other cylinders are normal range.
The problems I have is my truck will randomly not start. Another issue is that sometimes it does start, but acts like it's only running on half the cylinders. When it does this, I'll kill the engine, and restart over and over again until it runs correctly (it will not clear up on it's own, I have to recrank the truck to fix the problem). When it acts like it runs on only half the cylinders, it does not trigger any codes, and it smokes like crazy (grey colored smoke). I've pulled valve covers off way more times than I'd like to count, and the UVC
harnesses are fully clipped in (and have the updated clips to keep them from popping off).
So I'm seriously doubting it's a UVC
harness issue (no P1316 that is typically associated with it). It does this with or without a chip. With very little to go on, I'm not sure what to start checking. I'm going to re-ohm the passenger's side valve cover one more time just to make sure, but after that I need some suggestions.